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1. The Recurrent Eclipsing Nova U Sco: A Short Review

Author

R. González-Riestra

Subjects
Engineering (General). Civil engineering (General), TA1-2040
Abstract

U Scorpii is the recurrent nova with the shortest inter-outburst period, only ten years. The last active phase took place at the beginning of 2010, and it provided a large amount of data from both ground-based and space observatories. This paper reviews some of the more relevant recent findings and points out some, still unanswered, questions.

Published
2015
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2. The changing-look AGN NGC 1566 in quiescence with XMM-Newton: a nuclear starburst and an AGN competing in power?

Author

L Tomás, G A Matzeu, E Jiménez Bailón, E Kalfountzou, M Santos-Lleó, M L Parker, L Ballo, N Loiseau, M Ehle, P Rodríguez-Pascual, and R González-Riestra

Subjects
Space and Planetary Science, Astronomy and Astrophysics
Abstract

Star formation accretion on to the super massive black holes (SMBHs) and feedback processes link the evolution of galaxies with their SMBHs. X-ray observations in the imaging and spectral regime have revealed to be an important tool to study the connection between nuclear activity and circumnuclear star formation in nearby active galactic nuclei (AGN). X-ray spectral diagnostics can lead to disentangle, which is the ionization mechanism in the central kiloparsecs of nearby AGN. In this paper, we investigate, by means of XMM-Newton observations, the nuclear X-ray emission of the changing-look AGN NGC 1566 during its quiescent state. European Photon Imaging Camera (EPIC) soft X-ray images show an extended arm-like morphology. A detailed analysis of the high-resolution Reflection Grating Spectrometer (RGS) and medium resolution EPIC spectra shows that the material concentrated in the central kiloparsecs region is not in the photoionization-dominated regime while the presence of collisionally ionized plasma is needed to explain the observed spectral features. In the inner region (∼1.5 kpc), the brightness of the collisionally ionized gas is comparable to the brightness of the photoionized gas: the inner region hosts a luminous starburst whose ionized gas shows up bright in the X-rays when the AGN is in quiescence.

Published
2022
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3. The origin of the supersoft X-ray-optical/UV flux anticorrelation in the symbiotic binary AG Draconis

Author

Roberto Viotti, M. Sekeráš, A. Skopal, and R. González-Riestra

Subjects
High Energy Astrophysical Phenomena (astro-ph.HE), Physics, Brightness, Photosphere, Astrophysics::High Energy Astrophysical Phenomena, X-ray binary, FOS: Physical sciences, White dwarf, Astronomy and Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, Radiation, Spectral line, Space and Planetary Science, Astrophysics::Solar and Stellar Astrophysics, Spectral energy distribution, Astrophysics - High Energy Astrophysical Phenomena, Spectroscopy, Astrophysics::Galaxy Astrophysics
Abstract

AG Draconis produces a strong supersoft X-ray emission.The X-ray and optical/UV fluxes are in a strict anticorrelation throughout the active and quiescent phases. The aim of this contribution is to identify the source of the X-ray emission and reveal the nature of the observed flux anticorrelation. For this purpose we model the X-ray and UV observations with XMM-Newton, far-UV spectroscopy from FUSE, low- and high-resolution IUE spectra and optical/near-IR spectroscopic and/or photometric observations. Our analysis showed that the supersoft X-ray emission is produced by the white dwarf photosphere. The X-ray and far-UV fluxes make it possible to determine its temperature unambiguously. The supersoft X-ray--optical/UV flux anticorrelation is caused by the variable wind from the hot star. The enhanced hot star wind gives rise to the optical bursts by reprocessing high-energy photons from the Lyman continuum to the optical/UV., 9 pages, 2 figures, 3 tables. Submitted to AA on 25/11/2008, revised on 27/05/2009

Published
2009
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4. XMM-Newton detection of relativistic Fe emission in the X-ray spectrum of SAX J1711.6–3808

Author

Bruno Altieri, R. González-Riestra, Celia Sanchez-Fernandez, R. Saxton, Maria Santos-Lleo, A. J. Castro-Tirado, and J. J. M. in 't Zand

Subjects
Black hole, Physics, Space and Planetary Science, Bulge, Astrophysics::High Energy Astrophysical Phenomena, X-ray, Astrophysics::Solar and Stellar Astrophysics, Astronomy, Astronomy and Astrophysics, Astrophysics, Emission spectrum, Spin (physics), Luminosity
Abstract

The transient system SAX J1711.6–3808 was observed by XMM-Newton during its 2001 outburst, when the source was close to its maximum outburst luminosity. Our observations show that the broad Fe emission line detected in this outburst by In' t Zand et al. (2002) has indeed a relativistic nature, suggesting that SAX J1711.6–3808 harbors a black hole with a high spin parameter. (© 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

Published
2006
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5. Planck Intermediate Results. IV. The XMM-Newton validation programme for new Planck clusters

Author

P. A. R. Ade, N. Aghanim, M. Arnaud, M. Ashdown, J. Aumont, C. Baccigalupi, A. Balbi, A. J. Banday, R. B. Barreiro, J. G. Bartlett, E. Battaner, K. Benabed, A. Benoît, J. P. Bernard, M. Bersanelli, I. Bikmaev, H. Böhringer, A. Bonaldi, J. R. Bond, J. Borrill, F. R. Bouchet, M. L. Brown, C. Burigana, R. C. Butler, P. Cabella, P. Carvalho, A. Catalano, L. Cayón, A. Chamballu, R. R. Chary, L. Y. Chiang, G. Chon, P. R. Christensen, D. L. Clements, S. Colafrancesco, S. Colombi, A. Coulais, B. P. Crill, F. Cuttaia, A. Da Silva, H. Dahle, R. J. Davis, P. de Bernardis, G. de Gasperis, G. de Zotti, J. Delabrouille, J. Démoclès, F. X. Désert, J. M. Diego, K. Dolag, H. Dole, S. Donzelli, O. Doré, M. Douspis, X. Dupac, T. A. Enßlin, H. K. Eriksen, F. Finelli, I. Flores Cacho, O. Forni, M. Frailis, E. Franceschi, M. Frommert, S. Galeotta, K. Ganga, R. T. Génova Santos, Y. Giraud Héraud, J. González Nuevo, R. González Riestra, K. M. Górski, A. Gruppuso, F. K. Hansen, D. Harrison, A. Hempel, S. Henrot Versillé, C. Hernández Monteagudo, D. Herranz, S. R. Hildebrandt, E. Hivon, M. Hobson, W. A. Holmes, A. Hornstrup, W. Hovest, K. M. Huffenberger, G. Hurier, A. H. Jaffe, T. Jagemann, W. C. Jones, M. Juvela, R. Kneissl, J. Knoche, L. Knox, M. Kunz, H. Kurki Suonio, G. Lagache, J. M. Lamarre, A. Lasenby, C. R. Lawrence, M. Le Jeune, S. Leach, R. Leonardi, A. Liddle, P. B. Lilje, M. Linden Vørnle, M. López Caniego, G. Luzzi, J. F. Macías Pérez, D. Maino, N. Mandolesi, R. Mann, M. Maris, F. Marleau, D. J. Marshall, E. Martínez González, S. Masi, M. Massardi, S. Matarrese, P. Mazzotta, S. Mei, P. R. Meinhold, A. Melchiorri, J. B. Melin, L. Mendes, A. Mennella, S. Mitra, M. A. Miville Deschênes, A. Moneti, G. Morgante, D. Mortlock, D. Munshi, P. Naselsky, F. Nati, P. Natoli, H. U. Nørgaard Nielsen, F. Noviello, S. Osborne, F. Pajot, D. Paoletti, O. Perdereau, F. Perrotta, F. Piacentini, M. Piat, E. Pierpaoli, R. Piffaretti, S. Plaszczynski, P. Platania, E. Pointecouteau, G. Polenta, L. Popa, T. Poutanen, G. W. Pratt, S. Prunet, J. L. Puget, M. Reinecke, M. Remazeilles, C. Renault, S. Ricciardi, G. Rocha, C. Rosset, M. Rossetti, J. A. Rubiño Martín, B. Rusholme, M. Sandri, G. Savini, D. Scott, G. F. Smoot, A. Stanford, F. Stivoli, R. Sudiwala, R. Sunyaev, D. Sutton, A. S. Suur Uski, J. F. Sygnet, J. A. Tauber, L. Terenzi, L. Toffolatti, M. Tomasi, M. Tristram, L. Valenziano, B. Van Tent, P. Vielva, F. Villa, N. Vittorio, L. A. Wade, B. D. Wandelt, N. Welikala, J. Weller, S. D. M. White, D. Yvon, A. Zacchei, A. Zonca, BORGANI, STEFANO, GREGORIO, ANNA, P. A. R., Ade, N., Aghanim, M., Arnaud, M., Ashdown, J., Aumont, C., Baccigalupi, A., Balbi, A. J., Banday, R. B., Barreiro, J. G., Bartlett, E., Battaner, K., Benabed, A., Benoît, J. P., Bernard, M., Bersanelli, I., Bikmaev, H., Böhringer, A., Bonaldi, J. R., Bond, Borgani, Stefano, J., Borrill, F. R., Bouchet, M. L., Brown, C., Burigana, R. C., Butler, P., Cabella, P., Carvalho, A., Catalano, L., Cayón, A., Chamballu, R. R., Chary, L. Y., Chiang, G., Chon, P. R., Christensen, D. L., Clement, S., Colafrancesco, S., Colombi, A., Coulai, B. P., Crill, F., Cuttaia, A., Da Silva, H., Dahle, R. J., Davi, P., de Bernardi, G., de Gasperi, G., de Zotti, J., Delabrouille, J., Démoclè, F. X., Désert, J. M., Diego, K., Dolag, H., Dole, S., Donzelli, O., Doré, M., Douspi, X., Dupac, T. A., Enßlin, H. K., Eriksen, F., Finelli, I., Flores Cacho, O., Forni, M., Fraili, E., Franceschi, M., Frommert, S., Galeotta, K., Ganga, R. T., Génova Santo, Y., Giraud Héraud, J., González Nuevo, R., González Riestra, K. M., Górski, Gregorio, Anna, A., Gruppuso, F. K., Hansen, D., Harrison, A., Hempel, S., Henrot Versillé, C., Hernández Monteagudo, D., Herranz, S. R., Hildebrandt, E., Hivon, M., Hobson, W. A., Holme, A., Hornstrup, W., Hovest, K. M., Huffenberger, G., Hurier, A. H., Jaffe, T., Jagemann, W. C., Jone, M., Juvela, R., Kneissl, J., Knoche, L., Knox, M., Kunz, H., Kurki Suonio, G., Lagache, J. M., Lamarre, A., Lasenby, C. R., Lawrence, M., Le Jeune, S., Leach, R., Leonardi, A., Liddle, P. B., Lilje, M., Linden Vørnle, M., López Caniego, G., Luzzi, J. F., Macías Pérez, D., Maino, N., Mandolesi, R., Mann, M., Mari, F., Marleau, D. J., Marshall, E., Martínez González, S., Masi, M., Massardi, S., Matarrese, P., Mazzotta, S., Mei, P. R., Meinhold, A., Melchiorri, J. B., Melin, L., Mende, A., Mennella, S., Mitra, M. A., Miville Deschêne, A., Moneti, G., Morgante, D., Mortlock, D., Munshi, P., Naselsky, F., Nati, P., Natoli, H. U., Nørgaard Nielsen, F., Noviello, S., Osborne, F., Pajot, D., Paoletti, O., Perdereau, F., Perrotta, F., Piacentini, M., Piat, E., Pierpaoli, R., Piffaretti, S., Plaszczynski, P., Platania, E., Pointecouteau, G., Polenta, L., Popa, T., Poutanen, G. W., Pratt, S., Prunet, J. L., Puget, M., Reinecke, M., Remazeille, C., Renault, S., Ricciardi, G., Rocha, C., Rosset, M., Rossetti, J. A., Rubiño Martín, B., Rusholme, M., Sandri, G., Savini, D., Scott, G. F., Smoot, A., Stanford, F., Stivoli, R., Sudiwala, R., Sunyaev, D., Sutton, A. S., Suur Uski, J. F., Sygnet, J. A., Tauber, L., Terenzi, L., Toffolatti, M., Tomasi, M., Tristram, L., Valenziano, B., Van Tent, P., Vielva, F., Villa, N., Vittorio, L. A., Wade, B. D., Wandelt, N., Welikala, J., Weller, S. D. M., White, D., Yvon, A., Zacchei, and A., Zonca

Subjects
galaxies: clusters: intracluster medium, clusters: intracluster medium [galaxies], galaxies: clusters: general, cosmology: observations, X-rays: galaxies: clusters, clusters: general [galaxies], galaxies: clusters [X-rays], cosmic background radiation, observation [cosmology]
Abstract

We present the final results from the XMM-Newton validation follow-up of new Planck galaxy cluster candidates. We observed 15 new candidates, detected with signal-to-noise ratios between 4.0 and 6.1 in the 15.5-month nominal Planck survey. The candidates were selected using ancillary data flags derived from the ROSAT All Sky Survey (RASS) and Digitized Sky Survey all-sky maps, with the aim of pushing into the low SZ flux, high-z regime and testing RASS flags as indicators of candidate reliability. Fourteen new clusters were detected by XMM-Newton, ten single clusters and two double systems. Redshifts from X-ray spectroscopy lie in the range 0.2 to 0.9, with six clusters at z > 0.5. Estimated masses (M500) range from 2.5 × 1014 to 8 × 1014 M⊙. We discuss our results in the context of the full XMM-Newton validation programme, in which 51 new clusters have been detected. This includes four double and two triple systems, some of which are chance projections on the sky of clusters at different redshifts. We find thatassociation with a source from the RASS-Bright Source Catalogue is a robust indicator of the reliability of a candidate, whereas association with a source from the RASS-Faint Source Catalogue does not guarantee that the SZ candidate is a bona fide cluster. Nevertheless, most Planck clusters appear in RASS maps, with a significance greater than 2σ being a good indication that the candidate is a real cluster. Candidate validation from association with SDSS galaxy overdensity at z > 0.5 is also discussed. The full sample gives a Planck sensitivity threshold of Y500 ~ 4 × 10-4 arcmin2, with indication for Malmquist bias in the YX-Y500 relation below this threshold. The corresponding mass threshold depends on redshift. Systems with M500 > 5 × 1014 M⊙ at z > 0.5 are easily detectable with Planck. The newly-detected clusters follow the YX-Y500 relation derived from X-ray selected samples. Compared to X-ray selected clusters, the new SZ clusters have a lower X-ray luminosity on average for their mass. There is no indication of departure from standard self-similar evolution in the X-ray versus SZ scaling properties. In particular, there is no significant evolution of the YX / Y500 ratio.

Published
2013

6. Optical and X-Ray Observations of the Symbiotic System Ag Draconis During Quiescence and Outburst

Author

M. Friedjung, Roberto Viotti, R. González-Riestra, V. F. Polcaro, Corinne Rossi, T. Iijima, Stefano Bernabei, Riccardo Claudi, and Jochen Greiner

Subjects
Physics, Energy distribution, Space and Planetary Science, Astrophysics::High Energy Astrophysical Phenomena, X-ray, Astrophysics::Solar and Stellar Astrophysics, Astronomy, Astronomy and Astrophysics, ag dra, optical spectroscopy, outburst, symbiotic binaries, x-rays, Astrophysics, Spectroscopy, Cosmology
Abstract

We review the main characteristics of the symbiotic system AG Draconis, with special emphasis on its optical and X-ray variations. We also discuss the X-ray to visual energy distribution during quiescence and outburst and describe our spectroscopic and X-ray observations during the 2003 outburst.

Published
2005
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7. Fifteen years of experience with the Reflection Grating Spectrometer on XMM-Newton

Author

F. B. S. Paerels, R. González-Riestra, Jelle Kaastra, A. M. T. Pollock, I. Ibarra, A. J. J. Raassen, C. Gabriel, C. P. de Vries, and J. W. den Herder

Subjects
Spectrometer, business.industry, Computer science, Detector, Grating, Radiation, Optics, Radiation damage, Calibration, Satellite, Grating spectrometer, Spectroscopy, business, Reflection (computer graphics), Remote sensing
Abstract

The RGS instrument is the X–ray spectrometer on board the XMM-Newton satellite, launched December 1999, and still fully operational. It consists of a reflection grating to disperse the incoming X–rays and a CCD camera as detector. In the past fifteen years a lot of experience has been gained in operating and calibrating this instrument. In this presentation we report on the calibration methods and status, new instrumental modes and detector performance, which were acquired and developed based on the in-flight experiences with the instrument. Selecting the proper operating modes, combined with careful data processing based on target characteristics and science goals, allows detection of weak spectral features, despite slowly degrading detectors due to radiation damage and contamination. At present the instrument has excellent health status and performance, and will be one of the few major instruments for X–ray spectroscopy in the coming years, until supplemented by new missions like ASTRO-H and, in particular, Athena.

Published
2014
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8. UV turn–off times of classical novae

Author

M. Orio, J. Gallagher, and R. González–Riestra

Subjects
Physics, Astrophysics::High Energy Astrophysical Phenomena, General Physics and Astronomy, Astronomy, Cataclysmic variable star, White dwarf, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, Spectral line, Luminosity, Turn off, Astrophysics::Solar and Stellar Astrophysics, Chemical composition, Astrophysics::Galaxy Astrophysics
Abstract

We present IUE spectra of classical novae obtained at least one year after the outburst. The UV luminosities are compared with the ROSAT observations and significant parameters of the systems. The turn–off times derived from the IUE data are in agreement with the ROSAT results, showing that most novae decline in bolometric luminosity $1{-}5$ years after the outburst. This is a signal of the exhaustion of the fuel in the hydrogen–burning layer on top of the white dwarf. There is not any clear dependence of the turn–off time on the speed class, the chemical composition or other parameters of the system. Data indicate that only a small fraction of the accreted layer is left on the white dwarf after the outburst.

Published
1998
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9. First Results of Continuous IUE Observations of Algol

Author

R. González-Riestra, A. Gimènez, and E. F. Guinan

Abstract

We present the first results of a continuous monitoring of Algol with IUE along 1.5 orbital period (4 1/3 days). A total of 32 high resolution spectra were obtained. Algol represents the final slow stage of mass transfer. The spectra show the presence of high ionization lines (NV, SiIV, CIV) due to the heating of the gas that impacts the accreting star. The depth of the primary eclipse is larger at shorter wavelengths and the shape of the continuum out of the eclipse is compatible with a B star, ruling out the presence of an extra light source at these wavelengths.

Published
1992
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10. AG Draconis observed with XMM-Newton

Author

Roberto Viotti, F. Montagni, T. Iijima, R. González-Riestra, Corinne Rossi, Antonio Frasca, S. Bernabei, and A. Skopal

Subjects
Physics, Astrophysics::High Energy Astrophysical Phenomena, X-ray binary, Astronomy, Astronomy and Astrophysics, Context (language use), Astrophysics, Spectral component, Luminosity, Space and Planetary Science, Symbiotic star, ROSAT, Astrophysics::Solar and Stellar Astrophysics, Light emission, Binary system, x-rays : binaries, x-rays : individuals : ag draconis, x-rays: binaries, x-rays: individuals: ag draconis
Abstract

Context. AG Draconis is the brightest symbiotic star in X-rays and one of the prototypes of the supersoft X-ray source class. Aims. Study of the X-ray spectrum of this peculiar binary system, covering both quiescence and activity periods, is necessary to investigate the physics of the high temperature spectral component, and to unveil the origin of the outbursts. Methods. X-ray and UV observations with XMM-Newton during 2003–2005 and coordinated optical spectrophotometric monitoring, together with archive data, are employed to derive the behaviour of the high energy source of the AG Dra system during different orbital and activity phases. Results. During quiescence the X-ray emission is very soft and is close in strength to the previous ROSAT observations, with an

Published
2008

11. Multiwavelength observations of the symbiotic star AG dra during 1979–1995

Author

J. A. Mattei, F. Montagni, Roberto Viotti, M. Friedjung, R. González-Riestra, M. Maesano, Aldo Altamore, Jochen Greiner, Jochen Greiner, Viotti, R, González Riestra, R, Montagni, F, Mattei, J, Maesano, M, Greiner, J, Friedjung, M, and Altamore, Aldo

Subjects
Physics, Symbiotic star, High velocity, medicine, Astronomy, Satellite, Astrophysics, Star (graph theory), medicine.disease_cause, Light curve, Ultraviolet
Abstract

Since 1980 the high velocity symbiotic system AG Dra has undergone three phases of activity (or “outbursts”) which were extensively observed in optical, ultraviolet and X-ray bands. We describe the historical light curve of the star, and summarize 17 years of UV monitoring with the IUE satellite.

Published
2007
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12. Classical novae in outburst: evolution of the ultraviolet emission lines in CO novae

Author

R. González-Riestra, Aldo Altamore, Angelo Cassatella, Cassatella, A, Altamore, Aldo, and Gonzalez Riestra, R.

Subjects
Physics, Range (particle radiation), Astronomy, Cataclysmic variable star, Astronomy and Astrophysics, Astrophysics, Optical decay, Nova (laser), medicine.disease_cause, Space and Planetary Science, Ionization, medicine, Emission spectrum, Ionization energy, Ultraviolet
Abstract

A comparative study is made of the temporal changes of the ionization level in seven CO novae well monitored with the IUE satellite at low resolution. The investigation is based on the evolution of the fluxes in eight strong ultraviolet emission lines covering a wide range of ionization potentials, from Mg II (7.6 eV) to N V (77.5 eV). We find that the rate of increase of the ionization conditions in the emitting regions is uniform in the sample of novae considered, provided the time scale is normalized to the optical decay time t(3). The implications of this result for the nova ejected masses and for the nuclear turnoff time are discussed.

Published
2005

13. First far-UV observations of KQ Puppis with FUSE

Author

R. González-Riestra, Roberto Viotti, and Corinne Rossi

Subjects
Physics, Line-of-sight, Gas interstellare, Flux, Astronomy and Astrophysics, Venti stellari, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Orbital period, Spectral line, symbols.namesake, Space and Planetary Science, Ionization, symbols, Astrophysics::Solar and Stellar Astrophysics, Satellite FUSE (NASA), Emission spectrum, Radiazione nel lontano ultravioletto, Rayleigh scattering, Astrophysics::Galaxy Astrophysics, Line (formation), Analisi dati
Abstract

We report the first far–ultraviolet spectrum of the emission line spectroscopic binary KQ Pup (M2Iab+B0Ve), obtained with FUSE shortly after conjunction at orbital phase $\Phi =0.13$. The spectrum presents a sharp flux cutoff at 1040 A; longwards, it is dominated by a large amount of resonant and low excitation transitions of neutral and singly ionized species, probably mostly of circumsystem origin, and by the Lyman absorption bands of H 2 , whose strength corresponds to an interstellar H 2 column density of ~$2\times 10^{20}$ cm -2 , indicating a fraction of molecular hydrogen 2 N (H 2 )/[ N (Hi)+2 N (H 2 )] of ~0.4. An N (Hi)/ E B-V ratio of $4.3\times 10^{21}$ is derived from the IUE spectra. The long–term UV monitoring of KQ Pup with IUE, HST and FUSE reveals a large decrease of the far–UV flux since orbital phase 0.82 and occupying more than 0.3 of the orbital period. This “shell” episode is attributed to line absorption and to Ly α Rayleigh scattering due to an extended dense cool envelope in the line of sight of the B star.

Published
2003

14. Calibration and in-orbit performance of the reflection grating spectrometer onboardXMM-Newton

Author

Jelle Kaastra, A. J. J. Raassen, A. Ibarra, A. M. T. Pollock, Frits Paerels, R. González-Riestra, J. W. den Herder, C. Gabriel, and C. P. de Vries

Subjects
Computer science, Astrophysics::High Energy Astrophysical Phenomena, Antenna aperture, Detector, Astrophysics::Instrumentation and Methods for Astrophysics, FOS: Physical sciences, Astronomy and Astrophysics, Context (language use), Grating, Space and Planetary Science, Calibration, Reflection (physics), Range (statistics), Orbit (dynamics), Astrophysics - Instrumentation and Methods for Astrophysics, Instrumentation and Methods for Astrophysics (astro-ph.IM), Remote sensing
Abstract

Context: XMM-Newton was launched on 10 December 1999 and has been operational since early 2000. One of the instruments onboard XMM-Newton is the reflection grating spectrometer (RGS). Two identical RGS instruments are available, with each RGS combining a reflection grating assembly (RGA) and a camera with CCDs to record the spectra. Aims: We describe the calibration and in-orbit performance of the RGS instrument. By combining the preflight calibration with appropriate inflight calibration data including the changes in detector performance over time, we aim at profound knowledge about the accuracy in the calibration. This will be crucial for any correct scientific interpretation of spectral features for a wide variety of objects. Methods: Ground calibrations alone are not able to fully characterize the instrument. Dedicated inflight measurements and constant monitoring are essential for a full understanding of the instrument and the variations of the instrument response over time. Physical models of the instrument are tuned to agree with calibration measurements and are the basis from which the actual instrument response can be interpolated over the full parameter space. Results: Uncertainties in the instrument response have been reduced to < 10% for the effective area and < 6 mA for the wavelength scale (in the range from 8 A to 34 A. The remaining systematic uncertainty in the detection of weak absorption features has been estimated to be 1.5%. Conclusions: Based on a large set of inflight calibration data and comparison with other instruments onboard XMM-Newton, the calibration accuracy of the RGS instrument has been improved considerably over the preflight calibrations., Accepted for publication in Astronomy and Astrophysics, Astronomical instrumentation section

Published
2015
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15. The INES Guide for Classical Novae

Author

R. González‐Riestra and A. Cassatella

Subjects
Physics, Astronomical Objects, Astronomy, Astrophysics, Light curve
Abstract

IUE ULDA/INES Access Guides have been published by ESA since 1989 with the purpose of facilitating the use of IUE data to scientists interested in a specific class of astronomical objects. We present here the “INES Guide for Classical Novae”, in which we shall collect all the available IUE data for a total of 36 novae in outburst and 20 old novae. The Guide will include basic information about each object, observing logs, visual light curves, and representative high and low dispersion spectra.

Published
2002
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16. Classical novae in outburst: The early evolution of the ultraviolet continuum

Author

R. González-Riestra, Angelo Cassatella, Aldo Altamore, Cassatella, A, Altamore, Aldo, and Gonzalez Riestra, R.

Subjects
Physics, Linear function (calculus), Astrophysics::High Energy Astrophysical Phenomena, Continuum (design consultancy), Phase (waves), Cataclysmic variable star, Astronomy, Flux, Astronomy and Astrophysics, Astrophysics, medicine.disease_cause, Space and Planetary Science, medicine, Range (statistics), Astrophysics::Solar and Stellar Astrophysics, Ultraviolet, Line (formation)
Abstract

In the framework of a phenomenological study of the ultraviolet properties of classical novae in outburst, we have selected 12 objects among the best monitored at low resolution with the IUE satellite, and studied the temporal evolution of the ultraviolet continuum and of the O I 1300 Angstrom line flux during the early post-outburst phase. We confirm that the UV flux maximum takes place systematically after the visual maximum and that its time delay is a linear function of t(3). A linear dependence on t3 is also found for the duration of the UV outburst and for the time the O I line flux reaches a maximum. This latter time marks the start of the transition phase to nebular conditions. Within the uncertainties imposed by the sample of objects used and by the observational errors, these results suggest a quite homogeneous behaviour of classical novae in the ultraviolet range.

Published
2002

18. Detection of a stellar flare at extreme ultraviolet wavelengths

Author

M. Denby, G. E. Bromage, John P. Pye, Martin A. Barstow, R. González-Riestra, and G. S. Pankiewicz

Subjects
Physics, Multidisciplinary, Astrophysics::High Energy Astrophysical Phenomena, Stellar rotation, Flare star, Astronomy, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, law.invention, Luminosity, Ultraviolet astronomy, law, Extreme ultraviolet, Physics::Space Physics, Binary star, ROSAT, Astrophysics::Solar and Stellar Astrophysics, Astrophysics::Galaxy Astrophysics, Flare
Abstract

During the all-sky survey conducted by the Rosat Wide Field Camera, the binary flare star system BY Draconis was monitored with coverage by the IUE satellite far-UV and optical observations and by the Rosat X-ray telescope for part of the time. A stellar flare was detected in all four wavebands. This is the first unambiguous EUV detection of a flare and one of the widest simultaneous wavelength-range coverages obtained. The peak luminosity and total energy of this flare in the photon energy range 0.08-0.18 keV are comparable with the values obtained for a number of flares integrated over a larger energy range by Exosat satellite observations in 1983-86. It is concluded that radiation in the EUV carries away a substantial fraction of the total flare energy.

Published
1991
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19. The peculiar X-ray behaviour of the outbursting symbiotic star AG draconis

Author

R. Viotti, J. Greiner, and R. González Riestra

Subjects
Physics, Nuclear and High Energy Physics, High energy, Extreme ultraviolet lithography, Astrophysics::High Energy Astrophysical Phenomena, X-ray, Astronomy, Flux, Rayos X, Radius, Astrophysics, medicine.disease_cause, Atomic and Molecular Physics, and Optics, Symbiotic star, ROSAT, medicine, Astrophysics::Solar and Stellar Astrophysics, Física nuclear, Ultraviolet
Abstract

The symbiotic system AG Dra is one of the best representatives of the category of the supersoft X-ray sources. The system was subject in recent times to a sequence of visual outbursts which were monitored in X-rays with the EXOSAT and ROSAT satellites, and in the ultraviolet with the IUE satellite. We find that during all the outbursts so far monitored, the visual brightening was associated with an increase of the UV flux, while the X-ray countrate largely faded. This systematic optical/UV and X-ray anticorrelation is explained, rather than by a quencing of the high energy source, by the increase of the accretor radius during outburst, and by the consequent decrease of its surface temperature which moves the maximum emission from soft X-rays to EUV. Sin financiación No data (1999) UEM

Published
1999

20. The IUE Final Archive: Conception to Completion

Author

A. Talavera, M. D. de La Pena, Jeffrey L. Linsky, R. González-Riestra, W. Wamsteker, J. Nichols-Bohlin, Yoji Kondo, D. Ponz, and A. Michalitsianos

Subjects
Computer science, Calibration, Extraction methods, Image processing, Satellite, Spectral resolution, Spectral data, Data science, Remote sensing
Abstract

The end product of the IUE mission will be a Final Archive containing all scientific and calibration data acquired with the satellite, uniformly processed with enhanced techniques and calibrations. This product is unique in that the development of the specifications for the IUE Final Archive has been guided to a large degree by input from the astronomical community. IUE is a collaborative project between NASA, ESA, and SERC. All three agencies have made important contributions to the development and implementation of the IUE Final Archive processing system. These new image processing techniques exploit the two-dimensional fixed pattern inherent in raw IUE data as a registration fiducial for photometric correction, utilize a single, flux-conserving resampling algorithm and a signal-weighted extraction method for the spectral data. The absolute flux calibration has also been redefined, with the relative fluxes based on models of white dwarf stars. These improvements result in increased signal-to-noise ratio and spectral resolution for many IUE images and render the dataset fully intercomparable. To maximize further the utility of the Final Archive, all fundamental observational and processing information about each image acquired with IUE has been verified and transcribed into the processed output files. Spectral data processed for the IUE Final Archive will begin to be available during 1993.

Published
1994
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22. Planck early results. XXVI. Detection with Planck and confirmation by XMM-Newton of PLCK G266.6-27.3, an exceptionally X-ray luminous and massive galaxy cluster at z~1

Author

Lähteenmäki, A., Poutanen, T., Natoli, P., Polenta, G., Bartlett, J.G., Catalano, A., Delabrouille, J., Fromenteau, S., Ganga, K., Le Jeune, M., Patanchon, G., Smoot, G.F., Ashdown, M., Brown, M.L., Carvalho, P., Chon, G., Hobson, M., Lasenby, A., Bhatia, R., Kneissl, R., Bond, J.R., Miville-Deschênes, M.-A., Banday, A.J., Bernard, J.-P., Forni, O., Giard, M., Leroy, C., Montier, L., Pointecouteau, E., Ristorcelli, I., Doré, O., Hildebrandt, S.R., Pearson, T.J., Prézeau, G., Rocha, G., Dahle, H., Lilje, P.B., Da Silva, A., Hernández-Monteagudo, C., Melin, J.-B., Piffaretti, R., Starck, J.-L., Yvon, D., Nørgaard-Nielsen, Hans Ulrik, Atrio-Barandela, F., Toffolatti, L., Marleau, F., Scott, D., Pierpaoli, E., Liddle, A., Juvela, M., Keihänen, E., Keskitalo, R., Kurki-Suonio, H., Nevalainen, J., Chiang, C., Jones, W.C., Cayón, L., White, M., Meinhold, P.R., Zonca, A., Wandelt, B.D., Matarrese, S., De Bernardis, P., Masi, S., Melchiorri, A., Piacentini, F., Bersanelli, M., Maino, D., Mennella, A., Tomasi, M., Borgani, S., Gregorio, A., Balbi, A., Cabella, P., De Gasperis, G., Mazzotta, P., Vittorio, N., Christensen, P.R., Naselsky, P., Flores-Cacho, I., Génova-Santos, R.T., Rebolo, R., Rubiño-Martín, J.A., González-Riestra, R., Dupac, X., Leonardi, R., Mendes, L., Tauber, J.A., De Zotti, G., Colafrancesco, S., Frailis, M., Galeotta, S., Pasian, F., Zacchei, A., Burigana, C., Cuttaia, F., Finelli, F., Franceschi, E., Gruppuso, A., Mandolesi, N., Morgante, G., Ricciardi, S., Sandri, M., Terenzi, L., Valenziano, L., Villa, F., Cappellini, B., Donzelli, S., Désert, F.-X., Türler, M., Clements, D.L., Jaffe, A.H., Mortlock, D., Novikov, D., Paladini, R., Benoît, A., Aghanim, N., Aumont, J., Dole, H., Douspis, M., Lagache, G., Noviello, F., Ponthieu, N., Puget, J.-L., Benabed, K., Bouchet, F.R., Colombi, S., Delouis, J.-M., Hivon, E., Moneti, A., Prunet, S., Sygnet, J.-F., Fosalba, P., Popa, L., Chiang, L.-Y., Efstathiou, G., Harrison, D., Munshi, D., Sutton, D., Eriksen, H.K., Hansen, F.K., Barreiro, R.B., Diego, J.M., López-Caniego, M., Martínez-González, E., Vielva, P., 'Arcangelo, O.D., Platania, P., Crill, B.P., Górski, K.M., Lawrence, C.R., O'Dwyer, I.J., Wade, L.A., Bonaldi, A., Davis, R.J., Dickinson, C., Lamarre, J.-M., Arnaud, M., Démoclès, J., Pratt, G.W., Hurier, G., MacÍas-Pérez, J.F., Perotto, L., Renault, C., Luzzi, G., Perdereau, O., Tristram, M., Borrill, J., Cantalupo, C.M., Kisner, T.S., Churazov, E., Enßlin, T.A., Rachen, J.P., Reinecke, M., Riller, T., White, S.D.M., Böhringer, H., Novikov, I., Savini, G., Baccigalupi, C., Danese, L., González-Nuevo, J., Leach, S., Perrotta, F., Osborne, S., Saar, E., Heinämäki, P., Schaefer, B.M., Weller, J., Battaner, E., N., Aghanim, M., Arnaud, M., Ashdown, F., Atrio Barandela, J., Aumont, C., Baccigalupi, A., Balbi, A. J., Banday, R. B., Barreiro, J. G., Bartlett, E., Battaner, K., Benabed, A., Benoît, J. P., Bernard, M., Bersanelli, R., Bhatia, H., Böhringer, A., Bonaldi, J. R., Bond, Borgani, Stefano, J., Borrill, F. R., Bouchet, M. L., Brown, C., Burigana, P., Cabella, C. M., Cantalupo, B., Cappellini, P., Carvalho, A., Catalano, L., Cayón, L. Y., Chiang, C., Chiang, G., Chon, P. R., Christensen, E., Churazov, D. L., Clement, S., Colafrancesco, S., Colombi, B. P., Crill, F., Cuttaia, A., Da Silva, H., Dahle, L., Danese, O. D., ’Arcangelo, R. J., Davi, P., de Bernardi, G., de Gasperi, G., de Zotti, J., Delabrouille, J. M., Deloui, J., Démoclè, F. X., Désert, C., Dickinson, J. M., Diego, H., Dole, S., Donzelli, O., Doré, M., Douspi, X., Dupac, G., Efstathiou, T. A., Enßlin, H. K., Eriksen, F., Finelli, I., Flores Cacho, O., Forni, P., Fosalba, M., Fraili, E., Franceschi, S., Fromenteau, S., Galeotta, K., Ganga, R. T., Génova Santo, M., Giard, J., González Nuevo, R., González Riestra, K. M., Górski, Gregorio, Anna, A., Gruppuso, F. K., Hansen, D., Harrison, P., Heinämäki, C., Hernández Monteagudo, S. R., Hildebrandt, E., Hivon, M., Hobson, G., Hurier, A. H., Jaffe, W. C., Jone, M., Juvela, E., Keihänen, R., Keskitalo, T. S., Kisner, R., Kneissl, H., Kurki Suonio, G., Lagache, A., Lähteenmäki, J. M., Lamarre, A., Lasenby, C. R., Lawrence, M., Le Jeune, S., Leach, R., Leonardi, C., Leroy, A., Liddle, P. B., Lilje, M., López Caniego, G., Luzzi, J. F., Macías Pérez, D., Maino, N., Mandolesi, F., Marleau, E., Martínez González, S., Masi, S., Matarrese, P., Mazzotta, P. R., Meinhold, A., Melchiorri, J. B., Melin, L., Mende, A., Mennella, M. A., Miville Deschêne, A., Moneti, L., Montier, G., Morgante, D., Mortlock, D., Munshi, P., Naselsky, P., Natoli, J., Nevalainen, H. U., Nørgaard Nielsen, F., Noviello, D., Novikov, I., Novikov, I. J., O’Dwyer, S., Osborne, R., Paladini, F., Pasian, G., Patanchon, T. J., Pearson, O., Perdereau, L., Perotto, F., Perrotta, F., Piacentini, E., Pierpaoli, R., Piffaretti, P., Platania, E., Pointecouteau, G., Polenta, N., Ponthieu, L., Popa, T., Poutanen, G. W., Pratt, G., Prézeau, S., Prunet, J. L., Puget, J. P., Rachen, R., Rebolo, M., Reinecke, C., Renault, S., Ricciardi, T., Riller, I., Ristorcelli, G., Rocha, J. A., Rubiño Martín, E., Saar, M., Sandri, G., Savini, B. M., Schaefer, D., Scott, G. F., Smoot, J. L., Starck, D., Sutton, J. F., Sygnet, J. A., Tauber, L., Terenzi, L., Toffolatti, M., Tomasi, M., Tristram, M., Türler, L., Valenziano, P., Vielva, F., Villa, N., Vittorio, L. A., Wade, B. D., Wandelt, J., Weller, S. D. M., White, M., White, D., Yvon, A., Zacchei, A., Zonca, Department of Physics, Helsinki Institute of Physics, APC - Cosmologie, Physique Corpusculaire et Cosmologie - Collège de France (PCC), Collège de France (CdF)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Collège de France (CdF)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-AstroParticule et Cosmologie (APC (UMR_7164)), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7), HELFA - Hélium : du fondamental aux applications, Institut Néel (NEEL), Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF), AstroParticule et Cosmologie (APC (UMR_7164)), APC - Gravitation (APC-Gravitation), PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Max-Planck-Institut für Gravitationsphysik ( Albert-Einstein-Institut ) (AEI), Max-Planck-Gesellschaft-Max-Planck-Gesellschaft, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), PLANCK, Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Hélium : du fondamental aux applications (HELFA), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Max-Planck-Institut für Gravitationsphysik ( Albert-Einstein-Institut ) (AEI), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Hélium : du fondamental aux applications (NEEL - HELFA), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Max-Planck-Institut für Gravitationsphysik ( Albert-Einstein-Institut ) (AEI), and Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SDU.ASTR.CO]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], Astrophysics, cosmic background radiation, x-rays, Cosmic background radiation, 01 natural sciences, 7. Clean energy, Luminosity, intracluster medium [clusters], galaxies, clusters: general [galaxies], clusters, observations [Cosmology], intracluster medium, 010303 astronomy & astrophysics, media_common, Physics, Solar mass, galaxies: cluster [X-rays], cosmic, observations, galaxies: clusters: general, symbols, Astrophysics - Cosmology and Nongalactic Astrophysics, observation [cosmology], Cosmology and Nongalactic Astrophysics (astro-ph.CO), galaxies: clusters: intracluster medium, media_common.quotation_subject, cosmology, general, education, FOS: Physical sciences, clusters: intracluster medium [Galaxies], Astrophysics::Cosmology and Extragalactic Astrophysics, clusters: intracluster medium, [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], background radiation, symbols.namesake, cosmology: observations, X-rays: galaxies: clusters, Settore FIS/05 - Astronomia e Astrofisica, 0103 physical sciences, Cluster (physics), Planck, [galaxies], Astrophysics::Galaxy Astrophysics, Galaxy cluster, 010308 nuclear & particles physics, Astronomy and Astrophysics, 115 Astronomy, Space science, Universe, Redshift, Space and Planetary Science, Sky, galaxies: clusters [X-rays]
Abstract

7 páginas, 3 figuras, 2 tablas.-- Planck Collaboration: et al., We present first results on PLCKG266.6−27.3, a galaxy cluster candidate detected at a signal-to-noise ratio of 5 in the Planck All Sky survey. An XMM-Newton validation observation has allowed us to confirm that the candidate isa bona fide galaxy cluster. With these X-ray data we measure an accurate redshift, z = 0.94 ± 0.02, and estimate the cluster mass to be M500 = (7.8 ± 0.8) × 1014 M⊙. PLCKG266.6−27.3 is an exceptional system: its luminosity of LX [0.5−2.0 keV] = (1.4 ± 0.05) × 1045 erg s-1 equals that of the two most luminous known clusters in the z > 0.5 universe, and it is one of the most massive clusters at z ~ 1. Moreover, unlike the majority of high-redshift clusters, PLCKG266.6−27.3 appears to be highly relaxed. This observation confirms Planck’s capability of detecting high-redshift, high-mass clusters, and opens the way to the systematic study of population evolution in the exponential tail of the mass function., The Planck Collaboration acknowledges the support of: ESA; CNES and CNRS/INSU-IN2P3-INP (France); ASI, CNR, and INAF (Italy); NASA and DoE (USA); STFC and UKSA (UK); CSIC, MICINN and JA (Spain); Tekes, AoF and CSC (Finland); DLR and MPG (Germany); CSA (Canada); DTU Space (Denmark); SER/SSO (Switzerland); RCN (Norway); SFI (Ireland); FCT/MCTES (Portugal); and DEISA (EU).

Published
2011
Full Text
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