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1. Expanding hot flow in the black hole binary SWIFT J1753.5-0127: evidence from optical timing

Author

Veledina, A., Gandhi, P., Hynes, R., Kajava, J. J. E., Tsygankov, S. S., Revnivtsev, M. G., Durant, M., and Poutanen, J.

Subjects
Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Solar and Stellar Astrophysics
Abstract

We describe the evolution of optical and X-ray temporal characteristics during the outburst decline of the black hole X-ray binary SWIFT J1753.5-0127. The optical/X-ray cross-correlation function demonstrates a single positive correlation at the outburst peak, then it has multiple dips and peaks during the decline stage, which are then replaced by the precognition dip plus peak structure in the outburst tail. Power spectral densities and phase lags show a complex evolution, revealing the presence of intrinsically connected optical and X-ray quasi-periodic oscillations. For the first time, we quantitatively explain the evolution of these timing properties during the entire outburst within one model, the essence of which is the expansion of the hot accretion flow towards the tail of the outburst. The pivoting of the spectrum produced by synchrotron Comptonization in the hot flow is responsible for the appearance of the anti-correlation with the X-rays and for the optical quasi-periodic oscillations. Our model reproduces well the cross-correlation and phase lag spectrum during the decline stage, which could not be understood with any model proposed before., Comment: 13 pages, 11 figures, MNRAS submitted

Published
2016
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2. The Large Observatory For x-ray Timing

Author

Feroci, M., Herder, J. W. den, Bozzo, E., Barret, D., Brandt, S., Hernanz, M., van der Klis, M., Pohl, M., Santangelo, A., Stella, L., Watts, A., Wilms, J., Zane, S., Ahangarianabhari, M., Albertus, C., Alford, M., Alpar, A., Altamirano, D., Alvarez, L., Amati, L., Amoros, C., Andersson, N., Antonelli, A., Argan, A., Artigue, R., Artigues, B., Atteia, J. -L., Azzarello, P., Bakala, P., Baldazzi, G., Balman, S., Barbera, M., van Baren, C., Bhattacharyya, S., Baykal, A., Belloni, T., Bernardini, F., Bertuccio, G., Bianchi, S., Bianchini, A., Binko, P., Blay, P., Bocchino, F., Bodin, P., Bombaci, I., Bidaud, J. -M. Bonnet, Boutloukos, S., Bradley, L., Braga, J., Brown, E., Bucciantini, N., Burderi, L., Burgay, M., Bursa, M., Budtz-Jørgensen, C., Cackett, E., Cadoux, F. R., Cais, P., Caliandro, G. A., Campana, R., Campana, S., Capitanio, F., Casares, J., Casella, P., Castro-Tirado, A. J., Cavazzuti, E., Cerda-Duran, P., Chakrabarty, D., Château, F., Chenevez, J., Coker, J., Cole, R., Collura, A., Cornelisse, R., Courvoisier, T., Cros, A., Cumming, A., Cusumano, G., D'Aì, A., D'Elia, V., Del Monte, E., De Luca, A., De Martino, D., Dercksen, J. P. C., De Pasquale, M., De Rosa, A., Del Santo, M., Di Cosimo, S., Diebold, S., Di Salvo, T., Donnarumma, I., Drago, A., Durant, M., Emmanoulopoulos, D., Erkut, M. H., Esposito, P., Evangelista, Y., Fabian, A., Falanga, M., Favre, Y., Feldman, C., Ferrari, V., Ferrigno, C., Finger, M., Finger, M. H., Fraser, G. W., Frericks, M., Fuschino, F., Gabler, M., Galloway, D. K., Sanchez, J. L. Galvez, Garcia-Berro, E., Gendre, B., Gezari, S., Giles, A. B., Gilfanov, M., Giommi, P., Giovannini, G., Giroletti, M., Gogus, E., Goldwurm, A., Goluchová, K., Götz, D., Gouiffes, C., Grassi, M., Groot, P., Gschwender, M., Gualtieri, L., Guidorzi, C., Guy, L., Haas, D., Haensel, P., Hailey, M., Hansen, F., Hartmann, D. H., Haswell, C. A., Hebeler, K., Heger, A., Hermsen, W., Homan, J., Hornstrup, A., Hudec, R., Huovelin, J., Ingram, A., Zand, J. J. M. in't, Israel, G., Iwasawa, K., Izzo, L., Jacobs, H. M., Jetter, F., Johannsen, T., Jonker, P., Josè, J., Kaaret, P., Kanbach, G., Karas, V., Karelin, D., Kataria, D., Keek, L., Kennedy, T., Klochkov, D., Kluzniak, W., Kokkotas, K., Korpela, S., Kouveliotou, C., Kreykenbohm, I., Kuiper, L. M., Kuvvetli, I., Labanti, C., Lai, D., Lamb, F. K., Laubert, P. P., Lebrun, F., Lin, D., Linder, D., Lodato, G., Longo, F., Lund, N., Maccarone, T. J., Macera, D., Maestre, S., Mahmoodifar, S., Maier, D., Malcovati, P., Mandel, I., Mangano, V., Manousakis, A., Marisaldi, M., Markowitz, A., Martindale, A., Matt, G., McHardy, I. M., Melatos, A., Mendez, M., Mereghetti, S., Michalska, M., Migliari, S., Mignani, R., Miller, M. C., Miller, J. M., Mineo, T., Miniutti, G., Morsink, S., Motch, C., Motta, S., Mouchet, M., Mouret, G., Mulačová, J., Muleri, F., Muñoz-Darias, T., Negueruela, I., Neilsen, J., Norton, A. J., Nowak, M., O'Brien, P., Olsen, P. E. H., Orienti, M., Orio, M., Orlandini, M., Orleanski, P., Osborne, J. P., Osten, R., Ozel, F., Pacciani, L., Paolillo, M., Papitto, A., Paredes, J. M., Patruno, A., Paul, B., Perinati, E., Pellizzoni, A., Penacchioni, A. V., Perez, M. A., Petracek, V., Pittori, C., Pons, J., Portell, J., Possenti, A., Poutanen, J., Prakash, M., Provost, P. Le, Psaltis, D., Rambaud, D., Ramon, P., Ramsay, G., Rapisarda, M., Rachevski, A., Rashevskaya, I., Ray, P. S., Rea, N., Reddy, S., Reig, P., Aranda, M. Reina, Remillard, R., Reynolds, C., Rezzolla, L., Ribo, M., de la Rie, R., Riggio, A., Rios, A., Gil, P. Rodríguez, Rodriguez, J., Rohlfs, R., Romano, P., Rossi, E. M. R., Rozanska, A., Rousseau, A., Ryde, F., Sabau-Graziati, L., Sala, G., Salvaterra, R., Sanna, A., Sandberg, J., Scaringi, S., Schanne, S., Schee, J., Schmid, C., Shore, S., Schneider, R., Schwenk, A., Schwope, A. D., Seyler, J. -Y., Shearer, A., Smith, A., Smith, D. M., Smith, P. J., Sochora, V., Soffitta, P., Soleri, P., Spencer, A., Stappers, B., Steiner, A. W., Stergioulas, N., Stratta, G., Strohmayer, T. E., Stuchlik, Z., Suchy, S., Sulemainov, V., Takahashi, T., Tamburini, F., Tauris, T., Tenzer, C., Tolos, L., Tombesi, F., Tomsick, J., Torok, G., Torrejon, J. M., Torres, D. F., Tramacere, A., Trois, A., Turolla, R., Turriziani, S., Uter, P., Uttley, P., Vacchi, A., Varniere, P., Vaughan, S., Vercellone, S., Vrba, V., Walton, D., Watanabe, S., Wawrzaszek, R., Webb, N., Weinberg, N., Wende, H., Wheatley, P., Wijers, R., Wijnands, R., Wille, M., Wilson-Hodge, C. A., Winter, B., Wood, K., Zampa, G., Zampa, N., Zampieri, L., Zdunik, L., Zdziarski, A., Zhang, B., Zwart, F., Ayre, M., Boenke, T., van Damme, C. Corral, Kuulkers, E., and Lumb, D.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

The Large Observatory For x-ray Timing (LOFT) was studied within ESA M3 Cosmic Vision framework and participated in the final down-selection for a launch slot in 2022-2024. Thanks to the unprecedented combination of effective area and spectral resolution of its main instrument, LOFT will study the behaviour of matter under extreme conditions, such as the strong gravitational field in the innermost regions of accretion flows close to black holes and neutron stars, and the supra-nuclear densities in the interior of neutron stars. The science payload is based on a Large Area Detector (LAD, 10 m 2 effective area, 2-30 keV, 240 eV spectral resolution, 1 deg collimated field of view) and a WideField Monitor (WFM, 2-50 keV, 4 steradian field of view, 1 arcmin source location accuracy, 300 eV spectral resolution). The WFM is equipped with an on-board system for bright events (e.g. GRB) localization. The trigger time and position of these events are broadcast to the ground within 30 s from discovery. In this paper we present the status of the mission at the end of its Phase A study., Comment: Proc. SPIE 9144, Space Telescopes and Instrumentation 2014: Ultraviolet to Gamma Ray, 91442T

Published
2014
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3. LOFT: the Large Observatory For X-ray Timing

Author

Feroci, M., Herder, J. W. den, Bozzo, E., Barret, D., Brandt, S., Hernanz, M., van der Klis, M., Pohl, M., Santangelo, A., Stella, L., Watts, A., Wilms, J., Zane, S., Ahangarianabhari, M., Alpar, A., Altamirano, D., Alvarez, L., Amati, L., Amoros, C., Andersson, N., Antonelli, A., Argan, A., Artigue, R., Azzarello, P., Baldazzi, G., Balman, S., Barbera, M., Belloni, T., Bertuccio, G., Bianchi, S., Bianchini, A., Bodin, P., Bidaud, J. -M. Bonnet, Boutloukos, S., Braga, J., Brown, E., Bucciantini, N., Burderi, L., Bursa, M., Budtz-Jørgensen, C., Cackett, E., Cadoux, F. R., Cais, P., Caliandro, G. A., Campana, R., Campana, S., Casella, P., Chakrabarty, D., Chenevez, J., Coker, J., Cole, R., Collura, A., Courvoisier, T., Cros, A., Cumming, A., Cusumano, G., D'Aì, A., D'Elia, V., Del Monte, E., De Martino, D., De Rosa, A., Di Cosimo, S., Diebold, S., Di Salvo, T., Donnarumma, I., Drago, A., Durant, M., Emmanoulopoulos, D., Evangelista, Y., Fabian, A., Falanga, M., Favre, Y., Feldman, C., Ferrigno, C., Finger, M. H., Fraser, G. W., Fuschino, F., Galloway, D. K., Sanchez, J. L. Galvez, Garcia-Berro, E., Gendre, B., Gezari, S., Giles, A. B., Gilfanov, M., Giommi, P., Giovannini, G., Giroletti, M., Goldwurm, A., Götz, D., Gouiffes, C., Grassi, M., Guidorzi, P. Groot C., Haas, D., Hansen, F., Hartmann, D. H., Haswe, C. A., Heger, A., Homan, J., Hornstrup, A., Hudec, R., Huovelin, J., Ingram, A., Zand, J. J. M. in't, Isern, J., Israe, G., Izzo, L., Jonker, P., Kaaret, P., Karas, V., Karelin, D., Kataria, D., Keek, L., Kennedy, T., Klochkov, D., Kluzniak, W., Kokkotas, K., Korpela, S., Kouveliotou, C., Kreykenbohm, I., Kuiper, L. M., Kuvvetli, I., Labanti, C., Lai, D., Lamb, F. K., Lebrun, F., Lin, D., Linder, D., Lodato, G., Longo, F., Lund, N., Maccarone, T. J., Macera, D., Maier, D., Malcovati, P., Mangano, V., Manousakis, A., Marisaldi, M., Markowitz, A., Martindale, A., Matt, G., McHardy, I. M., Melatos, A., Mendez, M., Migliari, S., Mignani, R., Miller, M. C., Miller, J. M., Mineo, T., Miniutti, G., Morsink, S., Motch, C., Motta, S., Mouchet, M., Muleri, F., Norton, A. J., Nowak, M., O'Brien, P., Orienti, M., Orio, M., Orlandini, M., Orleanski, P., Osborne, J. P., Osten, R., Ozel, F., Pacciani, L., Papitto, A., Paul, B., Perinati, E., Petracek, V., Portell, J., Poutanen, J., Psaltis, D., Rambaud, D., Ramsay, G., Rapisarda, M., Rachevski, A., Ray, P. S., Rea, N., Reddy, S., Reig, P., Aranda, M. Reina, Remillard, R., Reynolds, C., Rodríguez-Gil, P., Rodriguez, J., Romano, P., Rossi, E. M. R., Ryde, F., Sabau-Graziati, L., Sala, G., Salvaterra, R., Sanna, A., Schanne, S., Schee, J., Schmid, C., Schwenk, A., Schwope, A. D., Seyler, J. -Y., Shearer, A., Smith, A., Smith, D. M., Smith, P. J., Sochora, V., Soffitta, P., Soleri, P., Stappers, B., Stelzer, B., Stergioulas, N., Stratta, G., Strohmayer, T. E., Stuchlik, Z., Suchy, S., Sulemainov, V., Takahashi, T., Tamburini, F., Tenzer, C., Tolos, L., Torok, G., Torrejon, J. M., Torres, D. F., Tramacere, A., Trois, A., Turriziani, S., Uter, P., Uttley, P., Vacchi, A., Varniere, P., Vaughan, S., Vercellone, S., Vrba, V., Walton, D., Watanabe, S., Wawrzaszek, R., Webb, N., Weinberg, N., Wende, H., Wheatley, P., Wijers, R., Wijnands, R., Wille, M., Wilson-Hodge, C. A., Winter, B., Wood, K., Zampa, G., Zampa, N., Zampieri, L., Zdziarski, A., and Zhang, B.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

The LOFT mission concept is one of four candidates selected by ESA for the M3 launch opportunity as Medium Size missions of the Cosmic Vision programme. The launch window is currently planned for between 2022 and 2024. LOFT is designed to exploit the diagnostics of rapid X-ray flux and spectral variability that directly probe the motion of matter down to distances very close to black holes and neutron stars, as well as the physical state of ultra-dense matter. These primary science goals will be addressed by a payload composed of a Large Area Detector (LAD) and a Wide Field Monitor (WFM). The LAD is a collimated (<1 degree field of view) experiment operating in the energy range 2-50 keV, with a 10 m^2 peak effective area and an energy resolution of 260 eV at 6 keV. The WFM will operate in the same energy range as the LAD, enabling simultaneous monitoring of a few-steradian wide field of view, with an angular resolution of <5 arcmin. The LAD and WFM experiments will allow us to investigate variability from submillisecond QPO's to year-long transient outbursts. In this paper we report the current status of the project., Comment: Proceedings of SPIE, Vol. 8443, Paper No. 8443-85, 2012

Published
2012
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4. The spectrum of the recycled PSR J0437-4715 and its white dwarf companion

Author

Durant, M., Kargaltsev, O., Pavlov, G. G., Kowalski, P. M., Posselt, B., van Kerkwijk, M. H., and Kaplan, D. L.

Subjects
Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Solar and Stellar Astrophysics
Abstract

We present extensive spectral and photometric observations of the recycled pulsar/white-dwarf binary containing PSR J0437-4715, which we analyzed together with archival X-ray and gamma-ray data, to obtain the complete mid-infrared to gamma-ray spectrum. We first fit each part of the spectrum separately, and then the whole multi-wavelength spectrum. We find that the optical-infrared part of the spectrum is well fit by a cool white dwarf atmosphere model with pure hydrogen composition. The model atmosphere (Teff = 3950pm150K, log g=6.98pm0.15, R_WD=(1.9pm0.2)e9 cm) fits our spectral data remarkably well for the known mass and distance (M=0.25pm0.02Msun, d=156.3pm1.3pc), yielding the white dwarf age (tau=6.0pm0.5Gyr). In the UV, we find a spectral shape consistent with thermal emission from the bulk of the neutron star surface, with surface temperature between 1.25e5 and 3.5e5K. The temperature of the thermal spectrum suggests that some heating mechanism operates throughout the life of the neutron star. The temperature distribution on the neutron star surface is non-uniform. In the X-rays, we confirm the presence of a high-energy tail which is consistent with a continuation of the cut-off power-law component (Gamma=1.56pm0.01, Ecut=1.1pm0.2GeV) that is seen in gamma-rays and perhaps even extends to the near-UV., Comment: 23 pages. To appear in ApJ

Published
2011
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5. Rapid optical and X-ray timing observations of GX 339-4: multi-component optical variability in the low/hard state

Author

Gandhi, P., Dhillon, V. S., Durant, M., Fabian, A. C., Kubota, A., Makishima, K., Malzac, J., Marsh, T. R., Miller, J. M., Shahbaz, T., Spruit, H. C., and Casella, P.

Subjects
Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Astrophysics of Galaxies
Abstract

A rapid timing analysis of VLT/ULTRACAM and RXTE observations of the black hole binary GX 339-4 in its 2007 low/hard state is presented. The optical light curves in the r', g' and u' filters show slow (~20 s) quasi-periodic variability. Upon this is superposed fast flaring activity on times approaching the best time resolution probed (~50 ms) and with maximum strengths of more than twice the local mean. Power spectral analysis over ~0.004-10 Hz is presented, and shows that although the average optical variability amplitude is lower than that in X-rays, the peak variability power emerges at a higher Fourier frequency in the optical. Energetically, we measure a large optical vs. X-ray flux ratio, higher than that seen when the source was fully jet-dominated. Such a large ratio cannot be easily explained with a disc alone. The optical:X-ray cross-spectrum shows a markedly different behaviour above and below ~0.2 Hz. The peak of the coherence function above this threshold is associated with a short optical time lag, also seen as the dominant feature in the time-domain cross-correlation at ~150 ms. The rms energy spectrum of these fast variations is best described by distinct physical components over the optical and X-ray regimes, and also suggests a maximal disc fraction of 20% at ~5000 A. If the constant time delay is due to propagation of fluctuations to (or within) the jet, this is the clearest optical evidence to date of the location of this component. The low-frequency QPO is seen in the optical but not in X-rays. Evidence of reprocessing emerges at the lowest Fourier frequencies, with optical lags at ~10 s and strong coherence in the blue u' filter. Simultaneous optical spectroscopy also shows the Bowen fluorescence blend, though its emission location is unclear. But canonical disc reprocessing cannot dominate the optical power easily, nor explain the fast variability. (abridged), Comment: Accepted for publication in MNRAS. 27 pages, 21 figures

Published
2010
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6. Two distant brown dwarfs in the UKIRT Infrared Deep Sky Survey Deep Extragalactic Survey Data Release 2

Author

Lodieu, N., Dobbie, P. D., Deacon, N. R., Venemans, B. P., and Durant, M.

Subjects
Astrophysics - Galaxy Astrophysics
Abstract

We present the discovery of two brown dwarfs in the UKIRT Infrared Deep Sky Survey (UKIDSS) Deep Extragalactic Survey (DXS) Data Release 2. Both objects were selected photometrically from six square degrees in DXS for their blue J-K colour and the lack of optical counterparts in the Sloan Digital Sky Survey (SDSS) Stripe 82. Additional optical photometry provided by the Canada-France-Hawaii Telescope Legacy Survey (CFHT-LS) corroborated the possible substellarity of these candidates. Subsequent methane imaging of UDXS J221611.51+003308.1 and UDXS J221903.10+002418.2, has confirmed them as T7$\pm$1 and T6$\pm$1 dwarfs at photometric distances of 81 (52-118 pc) and 60 (44-87 pc; 2 sigma confidence level). A similar search in the second data release of the Ultra Deep Survey over a smaller area (0.77 square degree) and shallower depth didn't return any late-T dwarf candidate. The numbers of late-T dwarfs in our study are broadly in line with a declining mass function when considering the current area and depth of the DXS and UDS. These brown dwarfs are the first discovered in the VIMOS 4 field and among the few T dwarfs found in pencil-beam surveys. They are valuable to investigate the scale height of T dwarfs., Comment: 9 pages, 4 figures, 2 Tables, to appear in MNRAS

Published
2009
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7. Optical pulsations from the anomalous X-ray pulsar 1E 1048.1-5937

Author

Dhillon, V. S., Marsh, T. R., Littlefair, S. P., Copperwheat, C. M., Kerry, P., Dib, R., Durant, M., Kaspi, V. M., Mignani, R. P., and Shearer, A.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

We present high-speed optical photometry of the anomalous X-ray pulsar 1E 1048.1-5937 obtained with ULTRACAM on the 8.2-m Very Large Telescope in June 2007. We detect 1E 1048.1-5937 at a magnitude of i'=25.3+/-0.2, consistent with the values found by Wang et al. (2008) and hence confirming their conclusion that the source was approximately 1 mag brighter than in 2003-2006 due to an on-going X-ray flare that started in March 2007. The increased source brightness enabled us to detect optical pulsations with an identical period (6.458 s) to the X-ray pulsations. The rms pulsed fraction in our data is 21+/-7%, approximately the same as the 2-10 keV X-ray rms pulsed fraction. The optical and X-ray pulse profiles show similar morphologies and appear to be approximately in phase with each other, the latter lagging the former by only 0.06+/-0.02 cycles. The optical pulsations in 1E 1048.1-5937 are very similar in nature to those observed in 4U 0142+61. The implications of our observations for models of anomalous X-ray pulsars are discussed., Comment: 5 pages, 3 figures, accepted for publication in MNRAS Letters

Published
2009
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8. The Large Observatory for x-ray timing

Author

Feroci, M, Herder, JW den, Bozzo, E, Barret, D, Brandt, S, Hernanz, M, van der Klis, M, Pohl, M, Santangelo, A, Stella, L, Watts, A, Wilms, J, Zane, S, Ahangarianabhari, M, Albertus, C, Alford, M, Alpar, A, Altamirano, D, Alvarez, L, Amati, L, Amoros, C, Andersson, N, Antonelli, A, Argan, A, Artigue, R, Artigues, B, Atteia, J-L, Azzarello, P, Bakala, P, Baldazzi, G, Balman, S, Barbera, M, van Baren, C, Bhattacharyya, S, Baykal, A, Belloni, T, Bernardini, F, Bertuccio, G, Bianchi, S, Bianchini, A, Binko, P, Blay, P, Bocchino, F, Bodin, P, Bombaci, I, Bidaud, J-M Bonnet, Boutloukos, S, Bradley, L, Braga, J, Brown, E, Bucciantini, N, Burderi, L, Burgay, M, Bursa, M, Budtz-Jørgensen, C, Cackett, E, Cadoux, FR, Caïs, P, Caliandro, GA, Campana, R, Campana, S, Capitanio, F, Casares, J, Casella, P, Castro-Tirado, AJ, Cavazzuti, E, Cerda-Duran, P, Chakrabarty, D, Château, F, Chenevez, J, Coker, J, Cole, R, Collura, A, Cornelisse, R, Courvoisier, T, Cros, A, Cumming, A, Cusumano, G, D'Ai, A, D'Elia, V, Del Monte, E, de Luca, A, de Martino, D, Dercksen, JPC, de Pasquale, M, De Rosa, A, Del Santo, M, Di Cosimo, S, Diebold, S, Di Salvo, T, Donnarumma, I, Drago, A, Durant, M, Emmanoulopoulos, D, Erkut, MH, Esposito, P, Evangelista, Y, Fabian, A, Falanga, M, and Favre, Y

Subjects
X-ray timing, X-ray spectroscopy, X-ray imaging, compact objects, X-ray detectors, microchannel plates, astro-ph.IM
Abstract

The Large Observatory For x-ray Timing (LOFT) was studied within ESA M3 Cosmic Vision framework and participated in the final downselection for a launch slot in 2022-2024. Thanks to the unprecedented combination of effective area and spectral resolution of its main instrument, LOFT will study the behaviour of matter under extreme conditions, such as the strong gravitational field in the innermost regions of accretion flows close to black holes and neutron stars, and the supranuclear densities in the interior of neutron stars. The science payload is based on a Large Area Detector (LAD, 10 m2 effective area, 2-30 keV, 240 eV spectral resolution, 1° collimated field of view) and a Wide Field Monitor (WFM, 2-50 keV, 4 steradian field of view, 1 arcmin source location accuracy, 300 eV spectral resolution). The WFM is equipped with an on-board system for bright events (e.g. GRB) localization. The trigger time and position of these events are broadcast to the ground within 30 s from discovery. In this paper we present the status of the mission at the end of its Phase A study.

Published
2014

9. Multiwavelength spectral and high time resolution observations of SWIFT J1753.5-0127: new activity?

Author

Durant, M., Gandhi, P., Shahbaz, T., Peralta, H. H., and Dhillon, V. S.

Subjects
Astrophysics
Abstract

We have conducted an extensive observational campaign of SWIFT J1753.5-0127 during June 2007 after its bright outburst episode in 2005. We have performed multi-band optical photometry, optical spectroscopy, X-ray spectroscopy and timing and ULTRACAM optical photometry simultaneously in three bands. Both the optical spectrum and the X-ray spectrum, along with enhanced brightness in broad-band photometry point to recent increased activity. We analyze the different spectral regions, finding a smooth optical continuum with a remarkable lack of lines and a very blue component modulated with a period of 3.2hr and a hard power-law X-ray spectrum. Both the X-ray and optical power spectra are flat at low frequencies up to the 0.1 Hz (10 s) range, then decreasing roughly as a power law consistent with flickering. Furthermore, the optical data show quasi-periodic oscillations (QPOs) near 0.08 Hz (13 s). Together with a dynamical and auto-correlation analysis of the light curves we attempt to construct a complete physical picture of this intriguing system., Comment: 20 pages. Accepted for publication in MNRAS

Published
2008
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10. Rapid optical and X-ray timing observations of GX 339-4: flux correlations at the onset of a low/hard state

Author

Gandhi, P., Makishima, K., Durant, M., Fabian, A. C., Dhillon, V. S., Marsh, T. R., Miller, J. M., Shahbaz, T., and Spruit, H. C.

Subjects
Astrophysics
Abstract

We present the discovery of optical/X-ray flux correlations on rapid timescales in the low/hard state of the Galactic black hole GX 339-4. The source had recently emerged from outburst and was associated with a relatively-faint counterpart with mag V~17. The optical (VLT/ULTRACAM) and X-ray (RXTE/PCA) data show a clear positive cross-correlation function (CCF) signal, with the optical peak lagging X-rays by ~ 150 ms, preceded by a shallow rise and followed by a steep decline along with broad anti-correlation dips. Examination of the light curves shows that the main CCF features are reproduced in superpositions of flares and dips. The CCF peak is narrow and the X-ray auto-correlation function (ACF) is broader than the optical ACF, arguing against reprocessing as the origin for the rapid optical emission. X-ray flaring is associated with spectral hardening, but no corresponding changes are detected around optical peaks and dips. The variability may be explained in the context of synchrotron emission with interaction between a jet and a corona. The complex CCF structure in GX 339-4 has similarities to that of another remarkable X-ray binary XTE J1118+480, in spite of showing a weaker maximum strength. Such simultaneous multi-wavelength, rapid timing studies provide key constraints for modeling the inner regions of accreting stellar sources., Comment: Accepted for publication in MNRAS Letters

Published
2008
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11. Swift J1753.5-0127: The Black Hole Candidate with the shortest orbital period

Author

Zurita, C., Durant, M., Torres, M. A. P., Shahbaz, T., Casares, J., and Steeghs, D.

Subjects
Astrophysics
Abstract

We present time-resolved photometry of the optical counterpart to the black hole candidate Swift J1753.5-0127, which has remained in the low/hard X-ray state and bright at optical/IR wavelengths since its discovery in 2005. At the time of our observations Swift J1753.5-0127 does not show a decay trend but remains stable at R=16.45 with a night to night variability of ~0.05 mag. The R-band light curves, taken from 2007 June 3 to August 31, are not sinusoidal, but exhibit a complex morphology with remarkable changes in shape and amplitude. The best period determination is 3.2443+-0.0010 hours. This photometric period is likely a superhump period, slightly larger than the orbital period. Therefore, Swift J1753.5-0127 is the black hole candidate with the shortest orbital period observed to date. Our estimation of the distance is comparable to values previously published and likely places Swift J1753.5-0127 in the Galactic halo., Comment: Accepted for publication in ApJ

Published
2008
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12. The variable radio-to-X-ray spectrum of the magnetar XTE J1810-197

Author

Camilo, F., Ransom, S. M., Penalver, J., Karastergiou, A., van Kerkwijk, M. H., Durant, M., Halpern, J. P., Reynolds, J., Thum, C., Helfand, D. J., Zimmerman, N., and Cognard, I.

Subjects
Astrophysics
Abstract

We have observed the 5.54s anomalous X-ray pulsar XTE J1810-197 at radio, millimeter, and infrared (IR) wavelengths, with the aim of learning about its broad-band spectrum. At the IRAM 30m telescope, we have detected the magnetar at 88 and 144GHz, the highest radio-frequency emission ever seen from a pulsar. At 88GHz we detected numerous individual pulses, with typical widths ~2ms and peak flux densities up to 45Jy. Together with nearly contemporaneous observations with the Parkes, Nancay, and Green Bank telescopes, we find that in late 2006 July the spectral index of the pulsar was -0.5

Published
2007
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13. The Unusual Binary Pulsar PSR J1744-3922: Radio Flux Variability, Near-infrared Observation and Evolution

Author

Breton, R. P., Roberts, M. S. E., Ransom, S. M., Kaspi, V. M., Durant, M., Bergeron, P., and Faulkner, A. J.

Subjects
Astrophysics
Abstract

PSR J1744-3922 is a binary pulsar exhibiting highly variable pulsed radio emission. We report on a statistical multi-frequency study of the pulsed radio flux variability which suggests that this phenomenon is extrinsic to the pulsar and possibly tied to the companion, although not strongly correlated with orbital phase. The pulsar has an unusual combination of characteristics compared to typical recycled pulsars: a long spin period (172 ms); a relatively high magnetic field strength (1.7x10^10 G); a very circular, compact orbit of 4.6 hours; and a low-mass companion (0.08 Msun). These spin and orbital properties are likely inconsistent with standard evolutionary models. We find similarities between the properties of the PSR J1744-3922 system and those of several other known binary pulsar systems, motivating the identification of a new class of binary pulsars. We suggest that this new class could result from either: a standard accretion scenario of a magnetar or a high-magnetic field pulsar; common envelope evolution with a low-mass star and a neutron star, similar to what is expected for ultra-compact X-ray binaries; or, accretion induced collapse of a white dwarf. We also report the detection of a possible K'=19.30(15) infrared counterpart at the position of the pulsar, which is relatively bright if the companion is a helium white dwarf at the nominal distance, and discuss its implications for the pulsar's companion and evolutionary history., Comment: 18 pages, 8 figures, accepted for publication of ApJ

Published
2007
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14. The first multi-wavelength campaign of AXP 4U 0142+61 from radio to hard X-rays

Author

Hartog, P. R. den, Kuiper, L., Hermsen, W., Rea, N., Durant, M., Stappers, B., Kaspi, V. M., and Dib, R.

Subjects
Astrophysics
Abstract

For the first time a quasi-simultaneous multi-wavelength campaign has been performed on an Anomalous X-ray Pulsar from the radio to the hard X-ray band. 4U 0142+61 was an INTEGRAL target for 1 Ms in July 2005. During these observations it was also observed in the X-ray band with Swift and RXTE, in the optical and NIR with Gemini North and in the radio with the WSRT. In this paper we present the source-energy distribution. The spectral results obtained in the individual wave bands do not connect smoothly; apparently components of different origin contribute to the total spectrum. Remarkable is that the INTEGRAL hard X-ray spectrum (power-law index 0.79 +/- 0.10) is now measured up to an energy of ~230 keV with no indication of a spectral break. Extrapolation of the INTEGRAL power-law spectrum to lower energies passes orders of magnitude underneath the NIR and optical fluxes, as well as the low ~30 microJy (2 sigma) upper limit in the radio band., Comment: 6 pages, 1 figure. To be published in the proceedings of the conference "Isolated Neutron Stars: from the Interior to the Surface" (April 24-28, 2006, London, UK), eds. S. Zane, R. Turolla and D. Page

Published
2006
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15. Correlated Infrared and X-ray Flux Changes Following the 2002 June Outburst of the Anomalous X-ray Pulsar 1E 2259+586

Author

Tam, C. R., Kaspi, V. M., van Kerkwijk, M. H., and Durant, M.

Subjects
Astrophysics
Abstract

We present the results of a near-infrared monitoring program of the Anomalous X-ray Pulsar 1E 2259+586, performed at the Gemini Observatory. This program began three days after the pulsar's 2002 June outburst, and spans ~1.5 years. We find that after an initial increase associated with the outburst, the near-infrared flux decreased continually and reached the pre-burst quiescent level after about one year. We compare both the near-infrared flux enhancement and its decay to those of the X-ray afterglow, and find them to be remarkably consistent. Fitting simple power laws to the RXTE pulsed flux and near-infrared data for t>1 day post-burst, we find the following decay indices: alpha=-0.21+/-0.01 (X-ray), alpha=-0.21+/-0.02 (near-infrared), where flux is a function of time such that F is proportional to t^alpha. This suggests that the enhanced infrared and X-ray fluxes have a physical link post-outburst, most likely from the neutron-star magnetosphere., Comment: 11 pages, 1 figure, accepted for publication in ApJL; minor wording changes, added observation program IDs, improved figure resolution

Published
2004
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16. A Strong, Broad Absorption Feature in the X-ray Spectrum of the Nearby Neutron Star RX J1605.3+3249

Author

van Kerkwijk, M. H., Kaplan, D. L., Durant, M., Kulkarni, S. R., and Paerels, F.

Subjects
Astrophysics
Abstract

We present X-ray spectra taken with XMM-Newton of RX J1605.3+3249, the third brightest in the class of nearby, thermally emitting neutron stars. In contrast to what is the case for the brightest object, RX J1856.5-3754, we find that the spectrum of RX J1605.3+3249 cannot be described well by a pure black body, but shows a broad absorption feature at 27\AA (0.45 keV). With this, it joins the handful of isolated neutron stars for which spectral features arising from the surface have been detected. We discuss possible mechanisms that might lead to the features, as well as the overall optical to X-ray spectral energy distribution, and compare the spectrum with what is observed for the other nearby, thermally emitting neutron stars. We conclude that we may be observing absorption due to the proton cyclotron line, as was suggested for the other sources, but weakened due to the strong-field quantum electrodynamics effect of vacuum resonance mode conversion., Comment: 30 pages, 7 figures, accepted for publication in ApJ

Published
2004
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19. Lung abnormalities depicted with hyperpolarized Xenon MRI in patients with Long COVID

Author

Grist, J.T., Collier, G.J., Walters, H., Kim, M., Chen, M., Abu Eid, G., Laws, A., Matthews, V., Jacob, K., Cross, S., Eves, A., Durant, M., Mcintyre, A., Thompson, R., Schulte, R.F., Raman, B., Robbins, P.A., Wild, J.M., Fraser, E., and Gleeson, F.

Abstract

Background\ud \ud Post-Covid-19 condition describes symptoms following COVID-19 infection after four weeks. Symptoms are wide-ranging but breathlessness is common.\ud \ud \ud \ud Purpose\ud \ud The purpose of this study was to determine whether the previously described lung abnormalities on Hp-XeMRI in post-hospitalised COVID-19 participants are also present in non-hospitalised participants with Post-Covid-19 condition.\ud \ud \ud \ud Methods\ud \ud In this prospective study, non-hospitalised Post-Covid-19 condition (NHLC) and post-hospitalised COVID-19 (PHC) participants were enrolled from 06/2020 to 08/2021. Participants had chest CT, hyperpolarized pulmonary 129Xenon MRI (Hp-XeMRI), pulmonary function tests, 1-minute sit-to-stand test and breathlessness questionnaires. Control subjects underwent HP-XeMRI only. CT scans were analysed for post COVID interstitial lung disease severity using a previously published scoring system, and Full-scale Airway Network (FAN) modelling. Analysis used group and pair-wise comparisons between participants and controls, and correlations between participant clinical and imaging data.\ud \ud \ud \ud Results\ud \ud A total of 11 NHLC (4:7 Male: Female, 44 ± 11 years, [37-50], (mean ± SD, [95% CI]) and 12 PHC (10:2, Male: Female, 58 ± 10 years, [52-64]) participants were included, with a significant difference in age between groups, p = 0.05. NHLC participants were 287 ± 79, [240-334] and PHC 143 ± 72, [105-190] days from infection, respectively. NHLC and PHC participants had normal or near normal CT scans (0.3/25 ± 0.6, [0-0.63] and 7/25 ± 5, [4-10], respectively). Gas transfer (DLCO (%)) was different between NHLC and PHC participants (76 ± 8%, [73-83] vs 86 ± 8%, [80-91] respectively, p = 0.04) but there was no evidence of other differences in lung function. Red Blood Cell:Tissue Plasma (RBC:TP) mean was different between volunteers vs PHC (0.45 ± 0.07, [0.43-0.47] vs (0.31 ± 0.10, [0.24-0.37], respectively, p = 0.02) and volunteers vs NHLC (0.37 ± 0.10, [0.31-0.44], p = 0.03) participants, but not between NHLC and PHC participants (p = 0.26). FAN results did not correlate with DLCO or Hp- XeMRI.\ud \ud \ud \ud Conclusion\ud \ud NHLC and PHC subjects showed Hp-XeMRI RBC:TP abnormalities, with NHLC participants demonstrating lower DLCO than PHC participants despite having normal CT scans.

Published
2022

22. The LOFT Mission Concept - A Status Update

Author

Feroci, M, Bozzo, E, Brandt, S, Hernanz, M, van Der Klis, M, Liu , L. -P, Orleanski, P, Pohl, M, Santangelo, A, Schanne, S, Stella, L, Takahashi, T, Tamura, H, Watts, A, Wilms, J, Zane, S, Zhang, S. -N, Bhattacharyya, S, Agudo, I, Ahangarianabhari, M, Albertus, C, Alford, M, Alpar, A, Altamirano, D, Alvarez, L, Amati, L, Amoros, C, Andersson, N, Antonelli, A, Argan, A, Artigue, R, Artigues, B, Atteia, J. -L, Azzarello, P, Bakala, P, Ballantyne, D. R, Baldazzi, G, Baldo, M, Balman, S, Barbera, M, van Baren, C, Barret, D, Baykal, A, Begelman, M, Behar, E, Behar, O, Belloni, T, Belluti, P, Bernardini, F, Bertuccio, G, Bianchini, A, Binko, P, Blay, P, Bocchino, P, Bode, M, Bodin, P, Bombaci, I, Bonnet Bidaud, J. -M, Schnittman, Jeremy David, Borghi, G, Boutloukos, N, Bouyjou, F, Bradley, L, Braga, J, Briggs, M. S, Brown, E, Buballa, M, Bucciantini, N, Burderi, L, Burgay, M, Bursa, M, Budtz-Jorgensen, C, Cackett, E, Cadoux, F. R, Cais, P, Caliandro, G. A, Campana, R, Campana, S, Cao, X, Capitanio, F, Casares, J, Casella, P, Castro-Tirado, A. J, Cavazzuti, E, Cavechi, Y, Celestin, S, Cerda-Duran, P, Chakrabarty, D, Chamel, N, Chateau, F, Chen, C, Chen, Y, Chenevez, J, Chernyakova, M, Coker, J, Cole, R, Collura, A, Coriat, M, Cornelisse, R, Costamante, L, Cros, A, Cui, W, Cumming, A, Cusumano, G, Czerny, B, D'Ai, A, D'Ammando, J. P. C, D'Elia, V, Dai, Z, Del Monte, E, De Luca, A, De Martino, D, Dercksen, J. P. C, De Pasquale, M, De Rosa, A, Del Santo, M, Di Cosimo, S, Degenaar, N, den Herder, J. W, Diebold, S, Di Salvo, T, Dong, Y, Donnarumma, I, Doroshenko, V, Doyle, G, Drake, S. A, Durant, M, Emmanoulopoulos, D, Enoto, T, Erkut, M. H, Esposito, P, Evangelista, Y, Fabian, A, Falanga, M, Favre, Y, Feldman, C, Fender, R, Feng, H, Ferrari, V, Ferrigno, C, Ficorella, F, Finger, M, Finger, M. H, Fraser, G. W, Frericks, N, Fullekrug, M, Fuschino, F, Gabler, M, Galloway, D. K, Galvez Sanchez, J. L, Gandhi, P, Gao, Z, Garcia-Berro, E, Gendre, B, Gevin, O, Gezari, S, Giles, A. B, Gilfanov, M, Giommi, P, Giovannini, G, Giroletti, M, Gogus, E, Goldwurm, A, Goluchova, K, Gotz, D, Gou, L, Gouiffes, C, Grandi, P, Grassi, M, Greiner, J, Grinberg, V, Groot, P, Gschwender, M, Gualtieri, L, Guedel, M, Guidorzi, C, Guy, L, Haas, D, Haensel, P, Hailey, M, Hamuguchi, K, Hansen, F, Hartmann, D. H, Haswell, C. A, Hebeler, K, Heger, A, Hempel, M, Hermsen, W, Homan, J, Hornstrup, A, Hudec, R, Huovelin, J, Huppenkothen, A, Inam, S. C, Ingram, A, in't Zand, J. J. M, Israel, G, Iwasawa, K, Izzo, L, Jacobs, H. M, Jetter, F, Johannsen, T, Jenke, P. A, Jonker, P, Jose, J, Kaaret, P, Kalamkar, M, Kalemci, E, Kanbach, G, Karas, V, Karelin, D, Kataria, D, Keek, L, Kennedy, T, Klochkov, D, Kluzniak, W, Koerding, E, Kokkotas, K, Komossa, S, Korpela, S, Kouveliotou, C, Kowalski, A. F, Kreykenbohm, I, Kuiper, L. M, Kunneriath, D, Kurkela, A, Kuvvetli, I, La Franca, F, Labanti, C, Lai, D, Lamb, F. K, Lachaud, C, Laubert, P. P, Lebrun, F, Li, X, Liang, E, Limousin, O, Lin, D, Linares, M, Linder, D, Lodato, G, Longo, F, Lu, F, Lund, N, Maccarone, T. J, Macera, D, Maestre, S, Mahmoodifar, S, Maier, D, Malcovati, P, Malzac, J, Malone, C, Mandel, D, Mangano, V, Manousakis, A, Marelli, M, Margueron, J, Marisaldi, M, Markoff, S. B, Markowitz, A, Marinucci, A, Martindale, A, Martinez, G, McHardy, I. M, Medina-Tanco, G, Mehdipour, M, Melatos, A, Mendez, M, Mereghetti, S, Migliari, S, Mignani, R, Michalska, M, Mihara, T, Miller, M. C, Miller, J. M, Mineo, T, Miniutti, G, Morsink, S, Motch, C, Motta, S, Mouchet, M, Mouret, G, Mulacova, J, Muleri, F, Munoz-Darias, T, Negueruela, I, Neilsen, J, Neubert, T, Norton, A. J, Nowak, M, Nucita, A, O'Brien, P, Oertel, M, Olsen, P. E. H, Orienti, M, Orio, M, Orlandini, M, Osborne, J. P, Osten, R, Ozel, F, Pacciani, L, Paerels, F, Paltini, S, Paolillo, M, Papadakis, I, Papitto, A, Paragi, Z, Paredes, J. M, Patruno, A, Paul, B, Pederiva, F, Perinati, E, Pellizzoni, A, Penacchioni, A. V, Peretz, U, Perez, M. A, Perez-Torres, M, Petersen, B. M, Petracek, V, Picciotto, A, Piemonte, C, Pittori, C, Pons, J, Portell, J, Possenti, A, Postnov, K, Poutanen, J, Prakash, M, Prandoni, I, Provost, H. Le, Psaltis, D, Pye, J, Qu, J, Rambaud, D, Ramon, P, Ramsay, G, Rapisarda, M, Rachevski, A, Rashevskaya, I, Ray, P. S, Rea, N, Reddy, S, Reig, P, Reina, M. Aranda, Remillard, R, Reynolds, C, Rezzolla, L, Ribo, M, Rie, R. de la, Riggio, A, Rios, A, Rischke, D. H, Rodríguez-Gil, P, Rodriguez, J, Rohlfs, R, Romano, P, Rossi, E. M .R, Rozanska, A, Rousseau, A, Rudak, B, Russell, D. M, Ryde, F, Sabau-Graziati, L, Sakamoto, T, Sala, G, Salvaterra, R, Salvetti, D, Sanna, A, Sandberg, J, Savolainen, T, Scaringi, S, Schaffner-Bielich, J, Schatz, H, Schee, J, Schmid, C, Serino, M, Shakura, N, Shore, S, Schnittman, J. D, Schneider, R, Schwenk, A, Schwope, A. D, Sedrakian, A, Seyler, J.-Y, Shearer, A, Slowikowska, A, Sims, M, Smith, A, Smith, D. M, Smith, P. J, Sobolewska, M, Sochora, V, Soffitta, P, Soleri, P, Song, L, Spencer, A, Stamerra, A, Stappers, B, Staubert, R, Steiner, A. W, Stergioulas, N, Stevens, A. L, Stratta, G, Strohmayer, T. E, Stuchlik, Z, Suchy, S, Suleimanov, V, Tamburini, F, Tauris, T, Tavecchio, F, Tenzer, C, Thielemann, F. K, Tiengo, A, Tolos, L, Tombesi, F, Tomsick, J, Torok, G, Torrejon, J. M, Torres, D. F, Torresi, E, Tramacere, A, Traulsen, I, Trois, A, Turolla, R, Turriziani, S, Typel, S, Uter, P, Uttley, P, Vacchi, A, Varniere, P, Vaughan, S, Vercellone, S, Vietri, M, Vincent, F. H, Vrba, V, Walton, D, Wang, J, Wang, Z, Watanabe, S, Wawrzaszek, R, Webb, N, Weinberg, N, Wende, H, Wheatley, P, Wijers, R, Wijnands, R, Wille, M, Wilson-Hodge, C. A, Winter, B, Walk, S. J, Wood, K, Woosley, S. E, Wu, X, Xiao, L, Xu, R, Yu, W, Yuan, F, Yuan, W, Yuan, Y, Zampa, G, Zampa, N, Zampieri, L, Zdunik, L, Zdziarski, A, Zech, A, Zhang, B, Zhang, C, Zhang, S, Zingale, M, Zorzi, N, and Zwart, F

Subjects
Astrophysics
Abstract

The Large Observatory For x-ray Timing (LOFT) is a mission concept which was proposed to ESA as M3 and M4 candidate in the framework of the Cosmic Vision 2015-2025 program. Thanks to the unprecedented combination of effective area and spectral resolution of its main instrument and the uniquely large field of view of its wide field monitor, LOFT will be able to study the behaviour of matter in extreme conditions such as the strong gravitational field in the innermost regions close to black holes and neutron stars and the supra-nuclear densities in the interiors of neutron stars. The science payload is based on a Large Area Detector (LAD, is greater than 8m2 effective area, 2-30 keV, 240 eV spectral resolution, 1 degree collimated field of view) and a Wide Field Monitor (WFM, 2-50 keV, 4 steradian field of view, 1 arcmin source location accuracy, 300 eV spectral resolution). The WFM is equipped with an on-board system for bright events (e.g., GRB) localization. The trigger time and position of these events are broadcast to the ground within 30 s from discovery. In this paper we present the current technical and programmatic status of the mission.

Published
2016
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23. Flares from a candidate Galactic magnetar suggest a missing link to dim isolated neutron stars

Author

Castro-Tirado, A.J., de Ugarte Postigol, A., Gorosabel, J., Jelinek, M., Fatkhullin, T.A., Sokolov, V.V., Ferrero, P., Kann, D.A., Klose, S., Sluse, D., Bremer, M., Winters, J.M., Nuernberger, D., Perez-Ramirez, D., Guerrero, M.A., French, J., Melady, G., Hanlon, L., McBreen, B., Leventis, K., Markoff, S.B., Leon, S., Kraus, A., Aceituno, F.J., Cunniffe, R., Kubanek, P., Vitek, S., Schulze, S., Wilson, A.C., Hudec, R., Durant, M., Gonzalez-Perez, J.M., Shahbaz, T., Guziy, S., Pandey, S.B., Pavlenko, L., Sonbas, E., Trushkin, S.A., Bursov, N.N., Nizhelskij, N.A., Sanchez-Fernandez, C., and Sabau-Graziati, L.

Subjects
Solar flares -- Observations -- Properties, Neutron stars -- Observations -- Natural history -- Properties, Stars -- Magnetic fields, Environmental issues, Science and technology, Zoology and wildlife conservation, Observations, Properties, Natural history
Abstract

Magnetars (1) are young neutron stars with very strong magnetic fields of the order of [10.sup.14]-[10.sup.15]G. They are detected in our Galaxy either as soft γ-ray repeaters or anomalous X-ray [...]

Published
2008

24. EFFECTS OF SOIL-PILE-STRUCTURE INTERACTION ON SEISMIC RESPONSE OF STRUCTURES

Author

Durant M. G, Di Sarno L, Simonelli A. L, Mylonakis G, Taylor C. A., Durant, M. G., Di Sarno, L, Simonelli, A. L., Mylonakis, G, and Taylor, C. A.

Subjects
modelling, seismic engineering, soil-structure interaction
Abstract

The interaction between soil, foundation and structure is a complex phenomenon in which several mechanisms are involved. Usually the soil structure interaction (SSI) is considered formed by two main mechanisms: the kinematic and the inertial interaction. Theoretical studies on the subject abound in the literature show that the effects of SSI on the earthquake response of structures included primarily the period elongation and the increase of equivalent viscous damping. Nonetheless, the experimental validations of such studies are still scarce. Such validations can be efficiently investigated with physical scaled model in 1-g or n-g devices. In the present paper the SSI is investigated by utilizing the set of data selected from a comprehensive experimental test program carried out on 1-g shaking table tests. The scaled model adopted in the shaking table tests comprises a group of five piles embedded in a by-layer deposit with or without a single degree of freedom connected to the piles with and without a rigid connection between them. The present work focused on the response of the scaled model when subjected to the strong motion recorded at Tolmezzo Station during the 1976 Friuli (Italy) earthquake. The experimental outcomes are compared with analytical results derived from well-established theoretical formulations existing in the literature for both the period elongation and the variation of the damping ratios. It is found that: (i) the SSI effect are, as expected, more evident in the system without connection between piles and (ii) the theoretical formula are not able to predict in an accurate manner these quantities due to the hypotheses at their base.

Published
2017

26. The LOFT mission concept: a status update

Author

den Herder, Jan-Willem A., Takahashi, Tadayuki, Bautz, Marshall, Feroci, M., Bozzo, E., Brandt, Søren, Hernanz, M., van der Klis, M., Liu, L.-P., Orleanski, P., Pohl, M., Santangelo, A., Schanne, S., Stella, L., Takahashi, T., Tamura, H., Watts, A., Wilms, J., Zane, S., Bhattacharyya, S., Agudo, I., Ahangarianabhari, M., Albertus, C., Alford, M., Alpar, A., Altamirano, D., Alvarez, L., Amati, L., Amoros, C., Andersson, Niclas, Antonelli, A., Argan, A., Artigue, R., Artigues, B., Atteia, J.-L., Azzarello, P., Bakala, P., Ballantyne, D., Baldazzi, G., Baldo, M., Balman, S., Barbera, M., van Baren, C., Barret, D., Baykal, A., Begelman, M., Behar, O., Belloni, T., Bernardini, F., Bertuccio, G., Bianchi, S., Bianchini, A., Binko, P., Blay, P., Bocchino, F., Bode, M., Bodin, Peter, Bombaci, I., Bonnet Bidaud, J.-M., Boutloukos, S., Bouyjou, F., Bradley, L., Braga, J., Briggs, M. S., Brown, Elliot John, Buballa, M., Bucciantini, N., Burderi, L., Burgay, M., Bursa, M., Budtz-Jørgensen, Carl, Cackett, E., Cadoux, F., Cais, P., Caliandro, G. A., Campana, S., Cao, Xianyi, Capitanio, F., Casares, J., Casella, P., Castro-Tirado, A. J., Cavazzuti, E., Cavechi, Y., Celestin, S., Cerda-Duran, P., Chakrabarty, D., Chamel, N., Château, F., Chen, Y., Chenevez, Jérôme, Chernyakova, M., Coker, J., Cole, R., Collura, A., Coriat, M., Cornelisse, R., Costamante, L., Cros, A., Cui, W., Cumming, A., Cusumano, G., Czerny, B., D'Aì, A., D'Ammando, F., D'Elia, V., Dai, Zhuojun, Del Monte, E., De Luca, A., De Martino, D., Dercksen, J. P. C., De Pasquale, M., De Rosa, A., Del Santo, M., Di Cosimo, S., Degenaar, N., den Herder, J. W., Diebold, S., Di Salvo, T., Dong, Y., Donnarumma, I., Doroshenko, V., Doyle, G., Drake, S. A., Durant, M., Emmanoulopoulos, D., Enoto, T., Erkut, M. H., Esposito, P., Evangelista, Y., Fabian, A., Falanga, M., Favre, Y., Feldman, C., Fender, R., Feng, Huan, Ferrari, V., Ferrigno, C., Finger, M. H., Fraser, G. W., Frericks, M., Fullekrug, M., Fuschino, F., Gabler, M., Galloway, D. K., Gálvez Sanchez, J. L., Gandhi, P., Gao, Z., Garcia-Berro, E., Gendre, B., Gevin, O., Gezari, S., Giles, A. B., Gilfanov, M., Giommi, P., Giovannini, G., Giroletti, M., Gogus, E., Goldwurm, A., Goluchová, K., Götz, D., Gou, L., Gouiffes, C., Grandi, P., Grassi, M., Greiner, J., Grinberg, V., Groot, P., Gschwender, M., Gualtieri, L., Guedel, M., Guidorzi, C., Guy, L., Haas, D., Haensel, P., Hailey, M., Hamuguchi, K., Hansen, Flemming, Hartmann, D. H., Haswell, C. A., Hebeler, K., Heger, A., Hempel, M., Hermsen, W., Homan, J., Hornstrup, Allan, Hudec, R., Huovelin, J., Huppenkothen, D., Inam, S. C., Ingram, A., In't Zand, J. J. M., Israel, G., Iwasawa, K., Izzo, L., Jacobs, H. M., Jetter, F., Johannsen, T., Jenke, P. A., Jonker, P., Josè, J., Kaaret, P., Kalamkar, K., Kalemci, E., Kanbach, G., Karas, V., Karelin, D., Kataria, D., Keek, L., Kennedy, T., Klochkov, D., Kluzniak, W., Koerding, E., Kokkotas, K., Komossa, S., Korpela, S., Kouveliotou, C., Kowalski, A. F., Kreykenbohm, I., Kuiper, L. M., Kunneriath, D., Kurkela, A., Kuvvetli, Irfan, La Franca, F., Labanti, C., Lai, D., Lamb, F. K., Lachaud, C., Laubert, P. P., Lebrun, F., Li, X., Liang, E., Limousin, O., Lin, D., Linares, M., Linder, D., Lodato, G., Longo, F., Lu, F., Lund, Niels, Maccarone, T. J., Macera, D., Maestre, S., Mahmoodifar, S., Maier, D., Malcovati, P., Malzac, J., Malone, C., Mandel, I., Mangano, V., Manousakis, A., Marelli, M., Margueron, J., Marisaldi, M., Markoff, S. B., Markowitz, A., Marinucci, A., Martindale, A., Martínez, G., McHardy, I. M., Medina-Tanco, G., Mehdipour, M., Melatos, A., Mendez, M., Mereghetti, S., Migliari, S., Mignani, R., Michalska, M., Mihara, T., Miller, J. M., Mineo, T., Miniutti, G., Morsink, S., Motch, C., Motta, S., Mouchet, M., Mouret, G., Mulacova, Jana Hanis, Muleri, F., Muñoz-Darias, T., Negueruela, I., Neilsen, J., Neubert, Torsten, Norton, A. J., Nowak, M., Nucita, A., O'Brien, P., Oertel, M., Olsen, Poul Erik Holmdahl, Orienti, M., Orio, M., Orlandini, M., Osborne, J. P., Osten, R., Ozel, F., Pacciani, L., Paerels, F., Paltani, S., Paolillo, M., Papadakis, I., Papitto, A., Paragi, Z., Paredes, J. M., Patruno, A., Paul, B., Pederiva, F., Perinati, E., Pellizzoni, A., Penacchioni, A. V., Peretz, U., Perez, M. A., Perez-Torres, M., Peterson, B. M., Petracek, V., Pittori, C., Pons, J., Portell, J., Possenti, A., Postnov, K., Poutanen, J., Prakash, M., Prandoni, I., Le Provost, H., Psaltis, D., Pye, J., Qu, Jing, Rambaud, D., Ramon, P., Ramsay, G., Rapisarda, M., Rashevski, A., Rashevskaya, I., Ray, P. S., Rea, N., Reddy, S., Reig, P., Reina Aranda, M., Remillard, R., Reynolds, C., Rezzolla, L., Ribo, M., de la Rie, R., Riggio, A., Rios, A., Rischke, D. H., Rodríguez-Gil, P., Rodriguez, J., Rohlfs, R., Romano, P., Rossi, E. M. R., Rozanska, A., Rousseau, A., Rudak, B., Russell, D. M., Ryde, F., Sabau-Graziati, L., Sakamoto, T., Sala, G., Salvaterra, R., Salvetti, D., Sanna, A., Sandberg, J., Savolainen, T., Scaringi, S., Schaffner-Bielich, J., Schatz, H., Schee, J., Schmid, C., Serino, M., Shakura, N., Shore, S., Schnittman, J. D., Schneider, Raphael, Schwenk, A., Schwope, A. D., Sedrakian, A., Seyler, J.-Y., Shearer, A., Slowikowska, A., Sims, M., Smith, P. J., Sobolewska, M., Sochora, V., Soffitta, P., Soleri, P., Song, L., Spencer, A., Stamerra, A., Stappers, B., Staubert, R., Steiner, A. W., Stergioulas, N., Stevens, A. L., Stratta, G., Strohmayer, T. E., Stuchlik, Z., Suchy, S., Suleimanov, V., Tamburini, F., Tauris, T., Tavecchio, F., Tenzer, C., Thielemann, F. K., Tiengo, A., Tolos, L., Tombesi, F., Tomsick, J., Torok, G., Torrejon, J. M., Torres, D. F., Torresi, Elena, Tramacere, A., Traulsen, I., Trois, A., Turolla, R., Turriziani, S., Typel, S., Uter, P., Uttley, P., Vacchi, A., Varniere, P., Vaughan, S., Vercellone, S., Vietri, M., Vincent, F. H., Vrba, V., Walton, D., Wang, Z., Watanabe, Shigeki, Wawrzaszek, R., Webb, N., Weinberg, N., Wende, H., Wheatley, P., Wijers, R., Wijnands, R., Wille, Mads, Wilson-Hodge, C. A., Winter, B., Walk, S. J., Wood, K., Woosley, S. E., Wu, X., Xu, Ruichao, Yu, Wenye, Yuan, Y., Zampa, N., Zampieri, L., Zdunik, L., Zdziarski, A., Zech, A., Zhang, S., Zingale, M., Zwart, F., den Herder, Jan-Willem A., Takahashi, Tadayuki, Bautz, Marshall, Feroci, M., Bozzo, E., Brandt, Søren, Hernanz, M., van der Klis, M., Liu, L.-P., Orleanski, P., Pohl, M., Santangelo, A., Schanne, S., Stella, L., Takahashi, T., Tamura, H., Watts, A., Wilms, J., Zane, S., Bhattacharyya, S., Agudo, I., Ahangarianabhari, M., Albertus, C., Alford, M., Alpar, A., Altamirano, D., Alvarez, L., Amati, L., Amoros, C., Andersson, Niclas, Antonelli, A., Argan, A., Artigue, R., Artigues, B., Atteia, J.-L., Azzarello, P., Bakala, P., Ballantyne, D., Baldazzi, G., Baldo, M., Balman, S., Barbera, M., van Baren, C., Barret, D., Baykal, A., Begelman, M., Behar, O., Belloni, T., Bernardini, F., Bertuccio, G., Bianchi, S., Bianchini, A., Binko, P., Blay, P., Bocchino, F., Bode, M., Bodin, Peter, Bombaci, I., Bonnet Bidaud, J.-M., Boutloukos, S., Bouyjou, F., Bradley, L., Braga, J., Briggs, M. S., Brown, Elliot John, Buballa, M., Bucciantini, N., Burderi, L., Burgay, M., Bursa, M., Budtz-Jørgensen, Carl, Cackett, E., Cadoux, F., Cais, P., Caliandro, G. A., Campana, S., Cao, Xianyi, Capitanio, F., Casares, J., Casella, P., Castro-Tirado, A. J., Cavazzuti, E., Cavechi, Y., Celestin, S., Cerda-Duran, P., Chakrabarty, D., Chamel, N., Château, F., Chen, Y., Chenevez, Jérôme, Chernyakova, M., Coker, J., Cole, R., Collura, A., Coriat, M., Cornelisse, R., Costamante, L., Cros, A., Cui, W., Cumming, A., Cusumano, G., Czerny, B., D'Aì, A., D'Ammando, F., D'Elia, V., Dai, Zhuojun, Del Monte, E., De Luca, A., De Martino, D., Dercksen, J. P. C., De Pasquale, M., De Rosa, A., Del Santo, M., Di Cosimo, S., Degenaar, N., den Herder, J. W., Diebold, S., Di Salvo, T., Dong, Y., Donnarumma, I., Doroshenko, V., Doyle, G., Drake, S. A., Durant, M., Emmanoulopoulos, D., Enoto, T., Erkut, M. H., Esposito, P., Evangelista, Y., Fabian, A., Falanga, M., Favre, Y., Feldman, C., Fender, R., Feng, Huan, Ferrari, V., Ferrigno, C., Finger, M. H., Fraser, G. W., Frericks, M., Fullekrug, M., Fuschino, F., Gabler, M., Galloway, D. K., Gálvez Sanchez, J. L., Gandhi, P., Gao, Z., Garcia-Berro, E., Gendre, B., Gevin, O., Gezari, S., Giles, A. B., Gilfanov, M., Giommi, P., Giovannini, G., Giroletti, M., Gogus, E., Goldwurm, A., Goluchová, K., Götz, D., Gou, L., Gouiffes, C., Grandi, P., Grassi, M., Greiner, J., Grinberg, V., Groot, P., Gschwender, M., Gualtieri, L., Guedel, M., Guidorzi, C., Guy, L., Haas, D., Haensel, P., Hailey, M., Hamuguchi, K., Hansen, Flemming, Hartmann, D. H., Haswell, C. A., Hebeler, K., Heger, A., Hempel, M., Hermsen, W., Homan, J., Hornstrup, Allan, Hudec, R., Huovelin, J., Huppenkothen, D., Inam, S. C., Ingram, A., In't Zand, J. J. M., Israel, G., Iwasawa, K., Izzo, L., Jacobs, H. M., Jetter, F., Johannsen, T., Jenke, P. A., Jonker, P., Josè, J., Kaaret, P., Kalamkar, K., Kalemci, E., Kanbach, G., Karas, V., Karelin, D., Kataria, D., Keek, L., Kennedy, T., Klochkov, D., Kluzniak, W., Koerding, E., Kokkotas, K., Komossa, S., Korpela, S., Kouveliotou, C., Kowalski, A. F., Kreykenbohm, I., Kuiper, L. M., Kunneriath, D., Kurkela, A., Kuvvetli, Irfan, La Franca, F., Labanti, C., Lai, D., Lamb, F. K., Lachaud, C., Laubert, P. P., Lebrun, F., Li, X., Liang, E., Limousin, O., Lin, D., Linares, M., Linder, D., Lodato, G., Longo, F., Lu, F., Lund, Niels, Maccarone, T. J., Macera, D., Maestre, S., Mahmoodifar, S., Maier, D., Malcovati, P., Malzac, J., Malone, C., Mandel, I., Mangano, V., Manousakis, A., Marelli, M., Margueron, J., Marisaldi, M., Markoff, S. B., Markowitz, A., Marinucci, A., Martindale, A., Martínez, G., McHardy, I. M., Medina-Tanco, G., Mehdipour, M., Melatos, A., Mendez, M., Mereghetti, S., Migliari, S., Mignani, R., Michalska, M., Mihara, T., Miller, J. M., Mineo, T., Miniutti, G., Morsink, S., Motch, C., Motta, S., Mouchet, M., Mouret, G., Mulacova, Jana Hanis, Muleri, F., Muñoz-Darias, T., Negueruela, I., Neilsen, J., Neubert, Torsten, Norton, A. J., Nowak, M., Nucita, A., O'Brien, P., Oertel, M., Olsen, Poul Erik Holmdahl, Orienti, M., Orio, M., Orlandini, M., Osborne, J. P., Osten, R., Ozel, F., Pacciani, L., Paerels, F., Paltani, S., Paolillo, M., Papadakis, I., Papitto, A., Paragi, Z., Paredes, J. M., Patruno, A., Paul, B., Pederiva, F., Perinati, E., Pellizzoni, A., Penacchioni, A. V., Peretz, U., Perez, M. A., Perez-Torres, M., Peterson, B. M., Petracek, V., Pittori, C., Pons, J., Portell, J., Possenti, A., Postnov, K., Poutanen, J., Prakash, M., Prandoni, I., Le Provost, H., Psaltis, D., Pye, J., Qu, Jing, Rambaud, D., Ramon, P., Ramsay, G., Rapisarda, M., Rashevski, A., Rashevskaya, I., Ray, P. S., Rea, N., Reddy, S., Reig, P., Reina Aranda, M., Remillard, R., Reynolds, C., Rezzolla, L., Ribo, M., de la Rie, R., Riggio, A., Rios, A., Rischke, D. H., Rodríguez-Gil, P., Rodriguez, J., Rohlfs, R., Romano, P., Rossi, E. M. R., Rozanska, A., Rousseau, A., Rudak, B., Russell, D. M., Ryde, F., Sabau-Graziati, L., Sakamoto, T., Sala, G., Salvaterra, R., Salvetti, D., Sanna, A., Sandberg, J., Savolainen, T., Scaringi, S., Schaffner-Bielich, J., Schatz, H., Schee, J., Schmid, C., Serino, M., Shakura, N., Shore, S., Schnittman, J. D., Schneider, Raphael, Schwenk, A., Schwope, A. D., Sedrakian, A., Seyler, J.-Y., Shearer, A., Slowikowska, A., Sims, M., Smith, P. J., Sobolewska, M., Sochora, V., Soffitta, P., Soleri, P., Song, L., Spencer, A., Stamerra, A., Stappers, B., Staubert, R., Steiner, A. W., Stergioulas, N., Stevens, A. L., Stratta, G., Strohmayer, T. E., Stuchlik, Z., Suchy, S., Suleimanov, V., Tamburini, F., Tauris, T., Tavecchio, F., Tenzer, C., Thielemann, F. K., Tiengo, A., Tolos, L., Tombesi, F., Tomsick, J., Torok, G., Torrejon, J. M., Torres, D. F., Torresi, Elena, Tramacere, A., Traulsen, I., Trois, A., Turolla, R., Turriziani, S., Typel, S., Uter, P., Uttley, P., Vacchi, A., Varniere, P., Vaughan, S., Vercellone, S., Vietri, M., Vincent, F. H., Vrba, V., Walton, D., Wang, Z., Watanabe, Shigeki, Wawrzaszek, R., Webb, N., Weinberg, N., Wende, H., Wheatley, P., Wijers, R., Wijnands, R., Wille, Mads, Wilson-Hodge, C. A., Winter, B., Walk, S. J., Wood, K., Woosley, S. E., Wu, X., Xu, Ruichao, Yu, Wenye, Yuan, Y., Zampa, N., Zampieri, L., Zdunik, L., Zdziarski, A., Zech, A., Zhang, S., Zingale, M., and Zwart, F.

Published
2016

27. The Large Observatory for x-ray timingSpace Telescopes and Instrumentation 2014: Ultraviolet to Gamma Ray

Author

Tadayuki, Takahashi, den Herder, Jan Willem A., Mark, Bautz, Feroci, M., den Herder, J. W., Bozzo, E., Barret, D., Brandt, S., Hernanz, M., van der Klis, M., Pohl, M., Santangelo, A., Stella, L., Watts, A., Wilms, J., Zane, S., Ahangarianabhari, M., Albertus, C., Alford, M., Alpar, A., Altamirano, D., Alvarez, L., Amati, L., Amoros, C., Andersson, N., Antonelli, A., Argan, A., Artigue, R., Artigues, B., Atteia, J. L., Azzarello, P., Bakala, P., Baldazzi, G., Balman, S., Barbera, M., van Baren, C., Bhattacharyya, S., Baykal, A., Belloni, T., Bernardini, F., Bertuccio, G., Bianchi, S., Bianchini, A., Binko, P., Blay, P., Bocchino, F., Bodin, P., Bombaci, I., Bonnet Bidaud, J. M., Boutloukos, S., Bradley, L., Braga, J., Brown, E., Bucciantini, N., Burderi, L., Burgay, M., Bursa, M., Budtz Jørgensen, C., Cackett, E., Cadoux, F. R., Caïs, P., Caliandro, G. A., Campana, R., Campana, S., Capitanio, F., Casares, J., Casella, P., Castro Tirado, A. J., Cavazzuti, E., Cerda Duran, P., Chakrabarty, D., Château, F., Chenevez, J., Coker, J., Cole, R., Collura, A., Cornelisse, R., Courvoisier, T., Cros, A., Cumming, A., Cusumano, G., D'Ai, A., D'Elia, V., Del Monte, E., de Luca, A., de Martino, D., Dercksen, J. P. C., de Pasquale, M., De Rosa, A., Del Santo, M., Di Cosimo, S., Diebold, S., Di Salvo, T., Donnarumma, I., Drago, A., Durant, M., Emmanoulopoulos, D., Erkut, M. H., Esposito, P., Evangelista, Y., Fabian, A., Falanga, M., Favre, Y., Feldman, C., Ferrari, Valeria, Ferrigno, C., Finger, M., Finger, M. H., Fraser, G. W., Frericks, M., Fuschino, F., Gabler, M., Galloway, D. K., Galvez Sanchez, J. L., Garcia Berro, E., Gendre, B., Gezari, S., Giles, A. B., Gilfanov, M., Giommi, P., Giovannini, G., Giroletti, M., Gogus, E., Goldwurm, A., Goluchová, K., Götz, D., Gouiffes, C., Grassi, M., Groot, P., Gschwender, M., Gualtieri, Leonardo, Guidorzi, C., Guy, L., Haas, D., Haensel, P., Hailey, M., Hansen, F., Hartmann, D. H., Haswell, C. A., Hebeler, K., Heger, A., Hermsen, W., Homan, J., Hornstrup, A., Hudec, R., Huovelin, J., Ingram, A., Zand, J. J. M. In't., Israel, G., Iwasawa, K., Izzo, L., Jacobs, H. M., Jetter, F., Johannsen, T., Jonker, P., Josè, J., Kaaret, P., Kanbach, G., Karas, V., Karelin, D., Kataria, D., Keek, L., Kennedy, T., Klochkov, D., Kluzniak, W., Kokkotas, K., Korpela, S., Kouveliotou, C., Kreykenbohm, I., Kuiper, L. M., Kuvvetli, I., Labanti, C., Lai, D., Lamb, F. K., Laubert, P. P., Lebrun, F., Lin, D., Linder, D., Lodato, G., Longo, F., Lund, N., Maccarone, T. J., Macera, D., Maestre, S., Mahmoodifar, S., Maier, D., Malcovati, P., Mandel, I., Mangano, V., Manousakis, A., Marisaldi, M., Markowitz, A., Martindale, A., Matt, G., Mchardy, I. M., Melatos, A., Mendez, M., Mereghetti, S., Michalska, M., Migliari, S., Mignani, R., Miller, M. C., Miller, J. M., Mineo, T., Miniutti, G., Morsink, S., Motch, C., Motta, S., Mouchet, M., Mouret, G., Mulačová, J., Muleri, F., Muñoz Darias, T., Negueruela, I., Neilsen, J., Norton, A. J., Nowak, M., O'Brien, P., Olsen, P. E. H., Orienti, M., Orio, M., Orlandini, M., Orleański, P., Osborne, J. P., Osten, R., Ozel, F., Pacciani, L., Paolillo, M., Papitto, A., Paredes, J. M., Patruno, A., Paul, B., Perinati, E., Pellizzoni, A., Penacchioni, A. V., Perez, M. A., Petracek, V., Pittori, C., Pons, J., Portell, J., Possenti, A., Poutanen, J., Prakash, M., Le Provost, P., Psaltis, D., Rambaud, D., Ramon, P., Ramsay, G., Rapisarda, M., Rachevski, A., Rashevskaya, I., Ray, P. S., Rea, N., Reddy, S., Reig, P., Reina Aranda, M., Remillard, R., Reynolds, C., Rezzolla, L., Ribo, M., de la Rie, R., Riggio, A., Rios, A., Rodríguez Gil, P., Rodriguez, J., Rohlfs, R., Romano, P., Rossi, E. M. R., Rozanska, A., Rousseau, A., Ryde, F., Sabau Graziati, L., Sala, G., Salvaterra, R., Sanna, A., Sandberg, J., Scaringi, S., Schanne, S., Schee, J., Schmid, C., Shore, S., Schneider, Raffaella, Schwenk, A., Schwope, A. D., Seyler, J. Y., Shearer, A., Smith, A., Smith, D. M., Smith, P. J., Sochora, V., Soffitta, P., Soleri, P., Spencer, A., Stappers, B., Steiner, A. W., Stergioulas, N., Stratta, G., Strohmayer, T. E., Stuchlik, Z., Suchy, S., Sulemainov, V., Takahashi, T., Tamburini, F., Tauris, T., Tenzer, C., Tolos, L., Tombesi, F., Tomsick, J., Torok, G., Torrejon, J. M., Torres, D. F., Tramacere, A., Trois, A., Turolla, R., Turriziani, S., Uter, P., Uttley, P., Vacchi, A., Varniere, P., Vaughan, S., Vercellone, S., Vrba, V., Walton, D., Watanabe, S., Wawrzaszek, R., Webb, N., Weinberg, N., Wende, H., Wheatley, P., Wijers, R., Wijnands, R., Wille, M., Wilson Hodge, C. A., Winter, B., Wood, K., Zampa, G., Zampa, N., Zampieri, L., Zdunik, L., Zdziarski, A., Zhang, B., Zwart, F., Ayre, M., Boenke, T., Corral van Damme, C., Erik, Kuulkers, and Lumb, D.

Published
2014

28. Description of groundwater droughts in the UK: 1890 to 2015

Author

Durant, M. and Durant, M.

Abstract

Droughts pose a threat to lives and livelihoods in many parts of the world and may also cause significant problems in temperate areas, including in the UK; a humid country, but one marked by significant regional and temporal/inter-annual variations in rainfall. For example, the recent UK drought of 2010-2012 (Kendon et al., 2013) exemplified many of these challenges. Despite its unusually abrupt termination, the drought had major impacts on agriculture, the environment and recreation, and was the focus of extensive media and public debate. As part of a NERC directed programme on Drought and Water Scarcity in the UK (http://www.nerc.ac.uk/research/funded/programmes/droughts/), a project to investigate and characterise episodes of historic drought and water scarcity in the UK using a systems-based study of drivers and impacts was awarded to a consortium led by the Centre for Ecology and Hydrolgy (CEH) and including the BGS. The project started in 2014 and will run until 2018. One of the aims of the study is to develop an inventory of droughts, including groundwater droughts, in the UK. This BGS report is the first contribution to the development of such an inventory and builds on the work of Bloomfield and Marchant (2013) who through development of the Standardised Groundwater level Index (SGI) were the first to systematically document groundwater droughts in the UK using groundwater level time series since the late 19th C. In this report groundwater drought events identified in those time series are explored further by placing them in the hydrometeorological context and by describing their impacts as recorded in the literature of the time and subsequently. The work described in this report was undertaken by Mason Durant in January 2015 as part of Research Assistant placement with BGS Groundwater Science Directorate, Wallingford.

Published
2015

29. Regulation of Postjatal Intestinal Maturation by Growth Hormone: Studies in Rats with Isolated Growth Hormone Deficiency

Author

Durant M, Dahlstrom Ka, Sharron E. Gargosky, Hellman Bh, and Ricardo O. Castillo

Subjects
medicine.medical_specialty, Hydrolases, medicine.medical_treatment, Dwarfism, Genes, Recessive, Weaning, Biology, Rats, Mutant Strains, Rats, Sprague-Dawley, Sucrase, Internal medicine, Intestine, Small, medicine, Animals, Dwarfism, Pituitary, Microvilli, Lactase, medicine.disease, Hypoplasia, Epithelium, Small intestine, Animals, Suckling, Rats, medicine.anatomical_structure, Endocrinology, Growth Hormone, Pediatrics, Perinatology and Child Health, Homeostasis
Abstract

During the 3rd wk of postnatal life in the rat, dramatic maturational changes occur in the structure and function of the small intestine, enabling the animal to make the transition from milk to solid food. To investigate the role of GH in the regulation of this complex process, we studied postnatal intestinal maturation in the spontaneous dwarf rat, a strain of Sprague-Dawley rats with an autosomal recessive mutation in the GH gene resulting in complete but isolated GH deficiency. GH-deficient and GH-normal littermates were studied at d 7 and 14 (suckling) and d 23 (postweaned). The body weight of GH-deficient animals was inhibited by 60% at each age. Longitudinal growth of the small intestine was not inhibited, suggesting that longitudinal small bowel growth is independent of GH regulation. Mucosal cell mass was significantly lower in GH deficiency at all ages studied, and digestive hydrolase capacity per cm of intestine was significantly lower in GH-deficient postweaned animals. However, epithelial cell mass increased markedly in association with weaning and the maturation of lactase, sucrase, and aminooligopeptidase proceeded normally in GH deficiency. These data suggest that, although GH is not required for normal postnatal intestinal maturation, the mucosal epithelial hypoplasia found in GH-deficient animals suggests that GH or GH-dependent factors act as an intestinal mucosal growth factor whose function is to promote the homeostatic or steady-state regulation of mucosal epithelial growth.

Published
1996
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30. Optical observations of PSR J2021+3651 with the GTC

Author

Ryspaeva, E B, primary, Kirichenko, A Yu, additional, Shibanov, Yu A, additional, Shternin, P S, additional, Danilenko, A A, additional, Zyuzin, D A, additional, Durant, M, additional, Kargaltsev, O Yu, additional, Pavlov, G G, additional, and Cabrera-Lavers, A, additional

Published
2015
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31. High time resolution optical/X-ray cross-correlations for X-ray binaries: anti-correlations and rapid variability

Author

Durant, M., Shahbaz, T., Gandhi, P., Cornelisse, R., Munoz-Darias, T., Casares, J., Dhillon, V., Marsh, T., Spruit, H., O'Brien, K., Steeghs, D., and Hynes, R.

Subjects
High Energy Astrophysical Phenomena (astro-ph.HE), FOS: Physical sciences, Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Instrumentation and Methods for Astrophysics, Instrumentation and Methods for Astrophysics (astro-ph.IM), QB
Abstract

Using simultaneous observations in X-rays and optical, we have performed a homogeneous analysis of the cross-correlation behaviours of four X-ray binaries: SWIFT J1753.5-0127, GX 339-4, Sco X-1, and Cyg X-2. With high time-resolution observations using ULTRACAM and RXTE, we concentrate on the short time-scale, dt, 46 pages. Accepted for publication in MNRAS

Published
2010
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33. The Large Observatory for x-ray timing

Author

Feroci, M., additional, den Herder, J. W., additional, Bozzo, E., additional, Barret, D., additional, Brandt, S., additional, Hernanz, M., additional, van der Klis, M., additional, Pohl, M., additional, Santangelo, A., additional, Stella, L., additional, Watts, A., additional, Wilms, J., additional, Zane, S., additional, Ahangarianabhari, M., additional, Albertus, C., additional, Alford, M., additional, Alpar, A., additional, Altamirano, D., additional, Alvarez, L., additional, Amati, L., additional, Amoros, C., additional, Andersson, N., additional, Antonelli, A., additional, Argan, A., additional, Artigue, R., additional, Artigues, B., additional, Atteia, J.-L., additional, Azzarello, P., additional, Bakala, P., additional, Baldazzi, G., additional, Balman, S., additional, Barbera, M., additional, van Baren, C., additional, Bhattacharyya, S., additional, Baykal, A., additional, Belloni, T., additional, Bernardini, F., additional, Bertuccio, G., additional, Bianchi, S., additional, Bianchini, A., additional, Binko, P., additional, Blay, P., additional, Bocchino, F., additional, Bodin, P., additional, Bombaci, I., additional, Bonnet Bidaud, J.-M., additional, Boutloukos, S., additional, Bradley, L., additional, Braga, J., additional, Brown, E., additional, Bucciantini, N., additional, Burderi, L., additional, Burgay, M., additional, Bursa, M., additional, Budtz-Jørgensen, C., additional, Cackett, E., additional, Cadoux, F. R., additional, Caïs, P., additional, Caliandro, G. A., additional, Campana, R., additional, Campana, S., additional, Capitanio, F., additional, Casares, J., additional, Casella, P., additional, Castro-Tirado, A. J., additional, Cavazzuti, E., additional, Cerda-Duran, P., additional, Chakrabarty, D., additional, Château, F., additional, Chenevez, J., additional, Coker, J., additional, Cole, R., additional, Collura, A., additional, Cornelisse, R., additional, Courvoisier, T., additional, Cros, A., additional, Cumming, A., additional, Cusumano, G., additional, D'Ai, A., additional, D'Elia, V., additional, Del Monte, E., additional, de Luca, A., additional, de Martino, D., additional, Dercksen, J. P. C., additional, de Pasquale, M., additional, De Rosa, A., additional, Del Santo, M., additional, Di Cosimo, S., additional, Diebold, S., additional, Di Salvo, T., additional, Donnarumma, I., additional, Drago, A., additional, Durant, M., additional, Emmanoulopoulos, D., additional, Erkut, M. H., additional, Esposito, P., additional, Evangelista, Y., additional, Fabian, A., additional, Falanga, M., additional, Favre, Y., additional, Feldman, C., additional, Ferrari, V., additional, Ferrigno, C., additional, Finger, M., additional, Finger, M. H., additional, Fraser, G. W., additional, Frericks, M., additional, Fuschino, F., additional, Gabler, M., additional, Galloway, D. K., additional, Galvez Sanchez, J. L., additional, Garcia-Berro, E., additional, Gendre, B., additional, Gezari, S., additional, Giles, A. B., additional, Gilfanov, M., additional, Giommi, P., additional, Giovannini, G., additional, Giroletti, M., additional, Gogus, E., additional, Goldwurm, A., additional, Goluchová, K., additional, Götz, D., additional, Gouiffes, C., additional, Grassi, M., additional, Groot, P., additional, Gschwender, M., additional, Gualtieri, L., additional, Guidorzi, C., additional, Guy, L., additional, Haas, D., additional, Haensel, P., additional, Hailey, M., additional, Hansen, F., additional, Hartmann, D. H., additional, Haswell, C. A., additional, Hebeler, K., additional, Heger, A., additional, Hermsen, W., additional, Homan, J., additional, Hornstrup, A., additional, Hudec, R., additional, Huovelin, J., additional, Ingram, A., additional, In't Zand, J. J. M., additional, Israel, G., additional, Iwasawa, K., additional, Izzo, L., additional, Jacobs, H. M., additional, Jetter, F., additional, Johannsen, T., additional, Jonker, P., additional, Josè, J., additional, Kaaret, P., additional, Kanbach, G., additional, Karas, V., additional, Karelin, D., additional, Kataria, D., additional, Keek, L., additional, Kennedy, T., additional, Klochkov, D., additional, Kluzniak, W., additional, Kokkotas, K., additional, Korpela, S., additional, Kouveliotou, C., additional, Kreykenbohm, I., additional, Kuiper, L. M., additional, Kuvvetli, I., additional, Labanti, C., additional, Lai, D., additional, Lamb, F. K., additional, Laubert, P. P., additional, Lebrun, F., additional, Lin, D., additional, Linder, D., additional, Lodato, G., additional, Longo, F., additional, Lund, N., additional, Maccarone, T. J., additional, Macera, D., additional, Maestre, S., additional, Mahmoodifar, S., additional, Maier, D., additional, Malcovati, P., additional, Mandel, I., additional, Mangano, V., additional, Manousakis, A., additional, Marisaldi, M., additional, Markowitz, A., additional, Martindale, A., additional, Matt, G., additional, McHardy, I. M., additional, Melatos, A., additional, Mendez, M., additional, Mereghetti, S., additional, Michalska, M., additional, Migliari, S., additional, Mignani, R., additional, Miller, M. C., additional, Miller, J. M., additional, Mineo, T., additional, Miniutti, G., additional, Morsink, S., additional, Motch, C., additional, Motta, S., additional, Mouchet, M., additional, Mouret, G., additional, Mulačová, J., additional, Muleri, F., additional, Muñoz-Darias, T., additional, Negueruela, I., additional, Neilsen, J., additional, Norton, A. J., additional, Nowak, M., additional, O'Brien, P., additional, Olsen, P. E. H., additional, Orienti, M., additional, Orio, M., additional, Orlandini, M., additional, Orleański, P., additional, Osborne, J. P., additional, Osten, R., additional, Ozel, F., additional, Pacciani, L., additional, Paolillo, M., additional, Papitto, A., additional, Paredes, J. M., additional, Patruno, A., additional, Paul, B., additional, Perinati, E., additional, Pellizzoni, A., additional, Penacchioni, A. V., additional, Perez, M. A., additional, Petracek, V., additional, Pittori, C., additional, Pons, J., additional, Portell, J., additional, Possenti, A., additional, Poutanen, J., additional, Prakash, M., additional, Le Provost, P., additional, Psaltis, D., additional, Rambaud, D., additional, Ramon, P., additional, Ramsay, G., additional, Rapisarda, M., additional, Rachevski, A., additional, Rashevskaya, I., additional, Ray, P. S., additional, Rea, N., additional, Reddy, S., additional, Reig, P., additional, Reina Aranda, M., additional, Remillard, R., additional, Reynolds, C., additional, Rezzolla, L., additional, Ribo, M., additional, de la Rie, R., additional, Riggio, A., additional, Rios, A., additional, Rodríguez-Gil, P., additional, Rodriguez, J., additional, Rohlfs, R., additional, Romano, P., additional, Rossi, E. M. R., additional, Rozanska, A., additional, Rousseau, A., additional, Ryde, F., additional, Sabau-Graziati, L., additional, Sala, G., additional, Salvaterra, R., additional, Sanna, A., additional, Sandberg, J., additional, Scaringi, S., additional, Schanne, S., additional, Schee, J., additional, Schmid, C., additional, Shore, S., additional, Schneider, R., additional, Schwenk, A., additional, Schwope, A. D., additional, Seyler, J.-Y., additional, Shearer, A., additional, Smith, A., additional, Smith, D. M., additional, Smith, P. J., additional, Sochora, V., additional, Soffitta, P., additional, Soleri, P., additional, Spencer, A., additional, Stappers, B., additional, Steiner, A. W., additional, Stergioulas, N., additional, Stratta, G., additional, Strohmayer, T. E., additional, Stuchlik, Z., additional, Suchy, S., additional, Sulemainov, V., additional, Takahashi, T., additional, Tamburini, F., additional, Tauris, T., additional, Tenzer, C., additional, Tolos, L., additional, Tombesi, F., additional, Tomsick, J., additional, Torok, G., additional, Torrejon, J. M., additional, Torres, D. F., additional, Tramacere, A., additional, Trois, A., additional, Turolla, R., additional, Turriziani, S., additional, Uter, P., additional, Uttley, P., additional, Vacchi, A., additional, Varniere, P., additional, Vaughan, S., additional, Vercellone, S., additional, Vrba, V., additional, Walton, D., additional, Watanabe, S., additional, Wawrzaszek, R., additional, Webb, N., additional, Weinberg, N., additional, Wende, H., additional, Wheatley, P., additional, Wijers, R., additional, Wijnands, R., additional, Wille, M., additional, Wilson-Hodge, C. A., additional, Winter, B., additional, Wood, K., additional, Zampa, G., additional, Zampa, N., additional, Zampieri, L., additional, Zdunik, L., additional, Zdziarski, A., additional, Zhang, B., additional, Zwart, F., additional, Ayre, M., additional, Boenke, T., additional, Corral van Damme, C., additional, Kuulkers, Erik, additional, and Lumb, D., additional

Published
2014
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34. LOFT: the Large Observatory For X-ray Timing

Author

Feroci, M., primary, den Herder, J. W., additional, Bozzo, E., additional, Barret, D., additional, Brandt, S., additional, Hernanz, M., additional, van der Klis, M., additional, Pohl, M., additional, Santangelo, A., additional, Stella, L., additional, Watts, A., additional, Wilms, J., additional, Zane, S., additional, Ahangarianabhari, M., additional, Alpar, A., additional, Altamirano, D., additional, Alvarez, L., additional, Amati, L., additional, Amoros, C., additional, Andersson, N., additional, Antonelli, A., additional, Argan, A., additional, Artigue, R., additional, Azzarello, P., additional, Baldazzi, G., additional, Balman, S., additional, Barbera, M., additional, Belloni, T., additional, Bertuccio, G., additional, Bianchi, S., additional, Bianchini, A., additional, Bodin, P., additional, Bonnet Bidaud, J.-M., additional, Boutloukos, S., additional, Braga, J., additional, Brown, E., additional, Bucciantini, N., additional, Burderi, L., additional, Bursa, M., additional, Budtz-Jørgensen, C., additional, Cackett, E., additional, Cadoux, F. R., additional, Cais, P., additional, Caliandro, G. A., additional, Campana, R., additional, Campana, S., additional, Casella, P., additional, Chakrabarty, D., additional, Chenevez, J., additional, Coker, J., additional, Cole, R., additional, Collura, A., additional, Courvoisier, T., additional, Cros, A., additional, Cumming, A., additional, Cusumano, G., additional, D'Ai, A., additional, D'Elia, V., additional, Del Monte, E., additional, de Martino, D., additional, De Rosa, A., additional, Di Cosimo, S., additional, Diebold, S., additional, Di Salvo, T., additional, Donnarumma, I., additional, Drago, A., additional, Durant, M., additional, Emmanoulopoulos, D., additional, Evangelista, Y., additional, Fabian, A., additional, Falanga, M., additional, Favre, Y., additional, Feldman, C., additional, Ferrigno, C., additional, Finger, M. H., additional, Fraser, G. W., additional, Fuschino, F., additional, Galloway, D. K., additional, Galvez Sanchez, J. L., additional, Garcia-Berro, E., additional, Gendre, B., additional, Gezari, S., additional, Giles, A. B., additional, Gilfanov, M., additional, Giommi, P., additional, Giovannini, G., additional, Giroletti, M., additional, Goldwurm, A., additional, Götz, D., additional, Gouiffes, C., additional, Grassi, M., additional, Groot, P., additional, Guidorzi, C., additional, Haas, D., additional, Hansen, F., additional, Hartmann, D. H., additional, Haswell, C. A., additional, Heger, A., additional, Homan, J., additional, Hornstrup, A., additional, Hudec, R., additional, Huovelin, J., additional, Ingram, A., additional, In't Zand, J. J. M., additional, Isern, J., additional, Israel, G., additional, Izzo, L., additional, Jonker, P., additional, Kaaret, P., additional, Karas, V., additional, Karelin, D., additional, Kataria, D., additional, Keek, L., additional, Kennedy, T., additional, Klochkov, D., additional, Kluzniak, W., additional, Kokkotas, K., additional, Korpela, S., additional, Kouveliotou, C., additional, Kreykenbohm, I., additional, Kuiper, L. M., additional, Kuvvetli, I., additional, Labanti, C., additional, Lai, D., additional, Lamb, F. K., additional, Lebrun, F., additional, Lin, D., additional, Linder, D., additional, Lodato, G., additional, Longo, F., additional, Lund, N., additional, Maccarone, T. J., additional, Macera, D., additional, Maier, D., additional, Malcovati, P., additional, Mangano, V., additional, Manousakis, A., additional, Marisaldi, M., additional, Markowitz, A., additional, Martindale, A., additional, Matt, G., additional, McHardy, I. M., additional, Melatos, A., additional, Mendez, M., additional, Migliari, S., additional, Mignani, R., additional, Miller, M. C., additional, Miller, J. M., additional, Mineo, T., additional, Miniutti, G., additional, Morsink, S., additional, Motch, C., additional, Motta, S., additional, Mouchet, M., additional, Muleri, F., additional, Norton, A. J., additional, Nowak, M., additional, O'Brien, P., additional, Orienti, M., additional, Orio, M., additional, Orlandini, M., additional, Orleanski, P., additional, Osborne, J. P., additional, Osten, R., additional, Ozel, F., additional, Pacciani, L., additional, Papitto, A., additional, Paul, B., additional, Perinati, E., additional, Petracek, V., additional, Portell, J., additional, Poutanen, J., additional, Psaltis, D., additional, Rambaud, D., additional, Ramsay, G., additional, Rapisarda, M., additional, Rachevski, A., additional, Ray, P. S., additional, Rea, N., additional, Reddy, S., additional, Reig, P., additional, Reina Aranda, M., additional, Remillard, R., additional, Reynolds, C., additional, Rodríguez-Gil, P., additional, Rodriguez, J., additional, Romano, P., additional, Rossi, E. M. R., additional, Ryde, F., additional, Sabau-Graziati, L., additional, Sala, G., additional, Salvaterra, R., additional, Sanna, A., additional, Schanne, S., additional, Schee, J., additional, Schmid, C., additional, Schwenk, A., additional, Schwope, A. D., additional, Seyler, J.-Y., additional, Shearer, A., additional, Smith, A., additional, Smith, D. M., additional, Smith, P. J., additional, Sochora, V., additional, Soffitta, P., additional, Soleri, P., additional, Stappers, B., additional, Steltzer, B., additional, Stergioulas, N., additional, Stratta, G., additional, Strohmayer, T. E., additional, Stuchlik, Z., additional, Suchy, S., additional, Sulemainov, V., additional, Takahashi, T., additional, Tamburini, F., additional, Tenzer, C., additional, Tolos, L., additional, Torok, G., additional, Torrejon, J. M., additional, Torres, D. F., additional, Tramacere, A., additional, Trois, A., additional, Turriziani, S., additional, Uter, P., additional, Uttley, P., additional, Vacchi, A., additional, Varniere, P., additional, Vaughan, S., additional, Vercellone, S., additional, Vrba, V., additional, Walton, D., additional, Watanabe, S., additional, Wawrzaszek, R., additional, Webb, N., additional, Weinberg, N., additional, Wende, H., additional, Wheatley, P., additional, Wijers, R., additional, Wijnands, R., additional, Wille, M., additional, Wilson-Hodge, C. A., additional, Winter, B., additional, Wood, K., additional, Zampa, G., additional, Zampa, N., additional, Zampieri, L., additional, Zdziarski, A., additional, and Zhang, B., additional

Published
2012
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45. PSR J1744–3922: Hint of a New Binary Pulsar Class

Author

Breton, R. P., primary, Robert, M. S. E., additional, Ransom, S. M., additional, Kaspi, V. M., additional, Durant, M., additional, Bergeron, P., additional, Faulkner, A. J., additional, Bassa, C., additional, Wang, Z., additional, and Cumming, A., additional

Published
2008
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