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51. The Spin of a Newborn Black Hole: Swift J1728.9-3613

Author

Draghis, Paul A., primary, Balakrishnan, Mayura, additional, Miller, Jon M., additional, Cackett, Edward, additional, Fabian, Andrew C., additional, Miller-Jones, James, additional, Ng, Mason, additional, Raymond, John C., additional, Reynolds, Mark, additional, and Zoghbi, Abderahmen, additional

Published
2023
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52. Timing Analysis of the 2022 Outburst of SAX J1808.4-3658: Hints of Orbital Decay

Author

ILLIANO, GIULIA, PAPITTO, ALESSANDRO, SANNA, ANDREA, Bult, Peter, AMBROSINO, Filippo, MIRAVAL ZANON, ARIANNA, Coti Zelati, Francesco, STELLA, Luigi, Altamirano, Diego, Baglio, Maria Cristina, BOZZO , ENRICO, BURDERI, LUCIANO, DE MARTINO, Domitilla, DI MARCO, ALESSANDRO, Di Salvo, Tiziana, Ferrigno, Carlo, Loktev, Vladislav, MARINO, ALESSIO, Ng, Mason, PILIA, Maura, Poutanen, Juri, Salmi, Tuomo, and ITA

Abstract

We present a pulse timing analysis of NICER observations of the accreting millisecond X-ray pulsar SAX J1808.4−3658 during the outburst that started on 2022 August 19. Similar to previous outbursts, after decaying from a peak luminosity of ≃1 × 1036 erg s−1 in about a week, the pulsar entered a ∼1 month long reflaring stage. Comparison of the average pulsar spin frequency during the outburst with those previously measured confirmed the long-term spin derivative of ${\dot{\nu }}_{\mathrm{SD}}=-(1.15\,\pm \,0.06)\times \,{10}^{-15}$ Hz s−1, compatible with the spin-down torque of a ≈1026 G cm3 rotating magnetic dipole. For the first time in the last twenty years, the orbital phase evolution shows evidence for a decrease of the orbital period. The long-term behavior of the orbit is dominated by an ∼11 s modulation of the orbital phase epoch consistent with a ∼21 yr period. We discuss the observed evolution in terms of a coupling between the orbit and variations in the mass quadrupole of the companion star.

Published
2023

53. A Strong X-Ray Polarization Signal from the Magnetar 1RXS J170849.0-400910

Author

Zane, Silvia, primary, Taverna, Roberto, additional, González–Caniulef, Denis, additional, Muleri, Fabio, additional, Turolla, Roberto, additional, Heyl, Jeremy, additional, Uchiyama, Keisuke, additional, Ng, Mason, additional, Tamagawa, Toru, additional, Caiazzo, Ilaria, additional, Di Lalla, Niccolò, additional, Marshall, Herman L., additional, Bachetti, Matteo, additional, La Monaca, Fabio, additional, Gau, Ephraim, additional, Di Marco, Alessandro, additional, Baldini, Luca, additional, Negro, Michela, additional, Omodei, Nicola, additional, Rankin, John, additional, Matt, Giorgio, additional, Pavlov, George G., additional, Kitaguchi, Takao, additional, Krawczynski, Henric, additional, Kislat, Fabian, additional, Kelly, Ruth, additional, Agudo, Iván, additional, Antonelli, Lucio A., additional, Baumgartner, Wayne H., additional, Bellazzini, Ronaldo, additional, Bianchi, Stefano, additional, Bongiorno, Stephen D., additional, Bonino, Raffaella, additional, Brez, Alessandro, additional, Bucciantini, Niccolò, additional, Capitanio, Fiamma, additional, Castellano, Simone, additional, Cavazzuti, Elisabetta, additional, Chen, Chieng-Ting, additional, Ciprini, Stefano, additional, Costa, Enrico, additional, De Rosa, Alessandra, additional, Del Monte, Ettore, additional, Di Gesu, Laura, additional, Donnarumma, Immacolata, additional, Doroshenko, Victor, additional, Dovčiak, Michal, additional, Ehlert, Steven R., additional, Enoto, Teruaki, additional, Evangelista, Yuri, additional, Fabiani, Sergio, additional, Ferrazzoli, Riccardo, additional, Garcia, Javier A., additional, Gunji, Shuichi, additional, Hayashida, Kiyoshi, additional, Iwakiri, Wataru, additional, Jorstad, Svetlana G., additional, Kaaret, Philip, additional, Karas, Vladimir, additional, Kolodziejczak, Jeffery J., additional, Latronico, Luca, additional, Liodakis, Ioannis, additional, Maldera, Simone, additional, Manfreda, Alberto, additional, Marin, Frédéric, additional, Marinucci, Andrea, additional, Marscher, Alan P., additional, Massaro, Francesco, additional, Mitsuishi, Ikuyuki, additional, Mizuno, Tsunefumi, additional, Ng, C.-Y., additional, O’Dell, Stephen L., additional, Oppedisano, Chiara, additional, Papitto, Alessandro, additional, Peirson, Abel L., additional, Perri, Matteo, additional, Pesce-Rollins, Melissa, additional, Petrucci, Pierre-Olivier, additional, Pilia, Maura, additional, Possenti, Andrea, additional, Poutanen, Juri, additional, Puccetti, Simonetta, additional, Ramsey, Brian D., additional, Ratheesh, Ajay, additional, Roberts, Oliver J., additional, Romani, Roger W., additional, Sgró, Carmelo, additional, Slane, Patrick, additional, Soffitta, Paolo, additional, Spandre, Gloria, additional, Swartz, Douglas A., additional, Tavecchio, Fabrizio, additional, Tawara, Yuzuru, additional, Tennant, Allyn F., additional, Thomas, Nicholas E., additional, Tombesi, Francesco, additional, Trois, Alessio, additional, Tsygankov, Sergey S., additional, Vink, Jacco, additional, Weisskopf, Martin C., additional, Wu, Kinwah, additional, and Xie, Fei, additional

Published
2023
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54. Timing Analysis of the 2022 Outburst of the Accreting Millisecond X-Ray Pulsar SAX J1808.4-3658: Hints of an Orbital Shrinking

Author

Illiano, Giulia, primary, Papitto, Alessandro, additional, Sanna, Andrea, additional, Bult, Peter, additional, Ambrosino, Filippo, additional, Miraval Zanon, Arianna, additional, Coti Zelati, Francesco, additional, Stella, Luigi, additional, Altamirano, Diego, additional, Baglio, Maria Cristina, additional, Bozzo, Enrico, additional, Burderi, Luciano, additional, de Martino, Domitilla, additional, Di Marco, Alessandro, additional, di Salvo, Tiziana, additional, Ferrigno, Carlo, additional, Loktev, Vladislav, additional, Marino, Alessio, additional, Ng, Mason, additional, Pilia, Maura, additional, Poutanen, Juri, additional, and Salmi, Tuomo, additional

Published
2023
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55. The X-Ray Polarimetry View of the Accreting Pulsar Cen X-3

Author

Tsygankov, Sergey S., primary, Doroshenko, Victor, additional, Poutanen, Juri, additional, Heyl, Jeremy, additional, Mushtukov, Alexander A., additional, Caiazzo, Ilaria, additional, Di Marco, Alessandro, additional, Forsblom, Sofia V., additional, González-Caniulef, Denis, additional, Klawin, Moritz, additional, La Monaca, Fabio, additional, Malacaria, Christian, additional, Marshall, Herman L., additional, Muleri, Fabio, additional, Ng, Mason, additional, Suleimanov, Valery F., additional, Sunyaev, Rashid A., additional, Turolla, Roberto, additional, Agudo, Iván, additional, Antonelli, Lucio A., additional, Bachetti, Matteo, additional, Baldini, Luca, additional, Baumgartner, Wayne H., additional, Bellazzini, Ronaldo, additional, Bianchi, Stefano, additional, Bongiorno, Stephen D., additional, Bonino, Raffaella, additional, Brez, Alessandro, additional, Bucciantini, Niccolò, additional, Capitanio, Fiamma, additional, Castellano, Simone, additional, Cavazzuti, Elisabetta, additional, Ciprini, Stefano, additional, Costa, Enrico, additional, Rosa, Alessandra De, additional, Del Monte, Ettore, additional, Gesu, Laura Di, additional, Lalla, Niccolò Di, additional, Donnarumma, Immacolata, additional, Dovčiak, Michal, additional, Ehlert, Steven R., additional, Enoto, Teruaki, additional, Evangelista, Yuri, additional, Fabiani, Sergio, additional, Ferrazzoli, Riccardo, additional, Garcia, Javier A., additional, Gunji, Shuichi, additional, Hayashida, Kiyoshi, additional, Iwakiri, Wataru, additional, Jorstad, Svetlana G., additional, Karas, Vladimir, additional, Kitaguchi, Takao, additional, Kolodziejczak, Jeffery J., additional, Krawczynski, Henric, additional, Latronico, Luca, additional, Liodakis, Ioannis, additional, Maldera, Simone, additional, Manfreda, Alberto, additional, Marin, Frédéric, additional, Marinucci, Andrea, additional, Marscher, Alan P., additional, Matt, Giorgio, additional, Mitsuishi, Ikuyuki, additional, Mizuno, Tsunefumi, additional, Ng, Chi-Yung, additional, O’Dell, Stephen L., additional, Omodei, Nicola, additional, Oppedisano, Chiara, additional, Papitto, Alessandro, additional, Pavlov, George G., additional, Peirson, Abel L., additional, Perri, Matteo, additional, Pesce-Rollins, Melissa, additional, Petrucci, Pierre-Olivier, additional, Pilia, Maura, additional, Possenti, Andrea, additional, Puccetti, Simonetta, additional, Ramsey, Brian D., additional, Rankin, John, additional, Ratheesh, Ajay, additional, Romani, Roger W., additional, Sgrò, Carmelo, additional, Slane, Patrick, additional, Soffitta, Paolo, additional, Spandre, Gloria, additional, Tamagawa, Toru, additional, Tavecchio, Fabrizio, additional, Taverna, Roberto, additional, Tawara, Yuzuru, additional, Tennant, Allyn F., additional, Thomas, Nicholas E., additional, Tombesi, Francesco, additional, Trois, Alessio, additional, Vink, Jacco, additional, Weisskopf, Martin C., additional, Wu, Kinwah, additional, Xie, Fei, additional, and Zane, Silvia, additional

Published
2022
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56. GRO J1750-27, a super-critical X-ray neutron star that does not blink an eye

Author

Malacaria, Christian, Ducci, Lorenzo, Falanga, Maurizio, Altamirano, Diego, Bozzo, Enrico, Guillot, Sebastien, Jaisawal, Gaurava, Kretschmar, Peter, Ng, Mason, Pradhan, Pragati, Rothschild, Richard, Sanna, Andrea, Thalammer, Philipp, and Wilms, Joern

Subjects
accreting x-ray pulsars, cyclotron line, x-ray, NUSTAR, NICER, neutron stars, pulse profiles
Abstract

When accreting X-ray pulsars (XRPs) undergo bright X-ray outbursts, their luminosity-dependent spectral and timing features can be analyzed in detail. The XRP GRO J1750-27 recently underwent one of such episodes, during which it was observed with NuSTAR and monitored with NICER. Such a data set is rarely available, as it samples the outburst over more than a month at a luminosity that is always exceeding ~5x1037 erg/s. This value is larger than the typical critical luminosity value, where a radiative shock is formed above the neutron star's surface. Our data analysis of the joint spectra confirms the discovery of a deep cyclotron line at a centroid energy of about 44 keV, corresponding to a magnetic field strength of 4.7x1012 G. This value is independently supported by the best-fit physical model for spectral formation in accreting XRPs, which also favors a distance of 14 kpc, in agreement with recent findings. Contrary to theoretical expectations and observational evidence from other similar sources, the pulse profiles as observed by NICER through the outburst raise, peak and decay remain remarkably steady. The NICER spectrum, including the iron K\($\alpha$\) line best-fit parameters, also remain almost unchanged at all probed outburst stages, similar to the pulsed fraction behavior. We argue that all these phenomena are linked and interpret them as resulting from a saturation effect of the accretion column's emission, which occurs in the high-luminosity regime.

Published
2022
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58. Polarized x-rays from a magnetar

Author

Taverna, Roberto, primary, Turolla, Roberto, additional, Muleri, Fabio, additional, Heyl, Jeremy, additional, Zane, Silvia, additional, Baldini, Luca, additional, González-Caniulef, Denis, additional, Bachetti, Matteo, additional, Rankin, John, additional, Caiazzo, Ilaria, additional, Di Lalla, Niccolò, additional, Doroshenko, Victor, additional, Errando, Manel, additional, Gau, Ephraim, additional, Kırmızıbayrak, Demet, additional, Krawczynski, Henric, additional, Negro, Michela, additional, Ng, Mason, additional, Omodei, Nicola, additional, Possenti, Andrea, additional, Tamagawa, Toru, additional, Uchiyama, Keisuke, additional, Weisskopf, Martin C., additional, Agudo, Ivan, additional, Antonelli, Lucio A., additional, Baumgartner, Wayne H., additional, Bellazzini, Ronaldo, additional, Bianchi, Stefano, additional, Bongiorno, Stephen D., additional, Bonino, Raffaella, additional, Brez, Alessandro, additional, Bucciantini, Niccolò, additional, Capitanio, Fiamma, additional, Castellano, Simone, additional, Cavazzuti, Elisabetta, additional, Ciprini, Stefano, additional, Costa, Enrico, additional, De Rosa, Alessandra, additional, Del Monte, Ettore, additional, Di Gesu, Laura, additional, Di Marco, Alessandro, additional, Donnarumma, Immacolata, additional, Dovčiak, Michal, additional, Ehlert, Steven R., additional, Enoto, Teruaki, additional, Evangelista, Yuri, additional, Fabiani, Sergio, additional, Ferrazzoli, Riccardo, additional, Garcia, Javier A., additional, Gunji, Shuichi, additional, Hayashida, Kiyoshi, additional, Iwakiri, Wataru, additional, Jorstad, Svetlana G., additional, Karas, Vladimir, additional, Kitaguchi, Takao, additional, Kolodziejczak, Jeffery J., additional, La Monaca, Fabio, additional, Latronico, Luca, additional, Liodakis, Ioannis, additional, Maldera, Simone, additional, Manfreda, Alberto, additional, Marin, Frédéric, additional, Marinucci, Andrea, additional, Marscher, Alan P., additional, Marshall, Herman L., additional, Matt, Giorgio, additional, Mitsuishi, Ikuyuki, additional, Mizuno, Tsunefumi, additional, Ng, Stephen C.-Y., additional, O’Dell, Stephen L., additional, Oppedisano, Chiara, additional, Papitto, Alessandro, additional, Pavlov, George G., additional, Peirson, Abel L., additional, Perri, Matteo, additional, Pesce-Rollins, Melissa, additional, Pilia, Maura, additional, Poutanen, Juri, additional, Puccetti, Simonetta, additional, Ramsey, Brian D., additional, Ratheesh, Ajay, additional, Romani, Roger W., additional, Sgrò, Carmelo, additional, Slane, Patrick, additional, Soffitta, Paolo, additional, Spandre, Gloria, additional, Tavecchio, Fabrizio, additional, Tawara, Yuzuru, additional, Tennant, Allyn F., additional, Thomas, Nicholas E., additional, Tombesi, Francesco, additional, Trois, Alessio, additional, Tsygankov, Sergey S., additional, Vink, Jacco, additional, Wu, Kinwah, additional, and Xie, Fei, additional

Published
2022
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59. The Thermonuclear X-Ray Bursts of 4U 1730–22

Author

Bult, Peter, primary, Mancuso, Giulio C., additional, Strohmayer, Tod E., additional, Albayati, Arianna C., additional, Altamirano, Diego, additional, Buisson, Douglas J. K., additional, Chenevez, Jérôme, additional, Guillot, Sebastien, additional, Güver, Tolga, additional, Iwakiri, Wataru, additional, Jaisawal, Gaurava K., additional, Ng, Mason, additional, Sanna, Andrea, additional, and Swank, Jean H., additional

Published
2022
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60. Observations of 4U 1626–67 with the Imaging X-Ray Polarimetry Explorer

Author

Marshall, Herman L., primary, Ng, Mason, additional, Rogantini, Daniele, additional, Heyl, Jeremy, additional, Tsygankov, Sergey S., additional, Poutanen, Juri, additional, Costa, Enrico, additional, Zane, Silvia, additional, Malacaria, Christian, additional, Agudo, Iván, additional, Antonelli, Lucio A., additional, Bachetti, Matteo, additional, Baldini, Luca, additional, Baumgartner, Wayne H., additional, Bellazzini, Ronaldo, additional, Bianchi, Stefano, additional, Bongiorno, Stephen D., additional, Bonino, Raffaella, additional, Brez, Alessandro, additional, Bucciantini, Niccolò, additional, Capitanio, Fiamma, additional, Castellano, Simone, additional, Cavazzuti, Elisabetta, additional, Ciprini, Stefano, additional, De Rosa, Alessandra, additional, Monte, Ettore Del, additional, Gesu, Laura Di, additional, Lalla, Niccolò Di, additional, Marco, Alessandro Di, additional, Donnarumma, Immacolata, additional, Doroshenko, Victor, additional, Dovčiak, Michal, additional, Ehlert, Steven R., additional, Enoto, Teruaki, additional, Evangelista, Yuri, additional, Fabiani, Sergio, additional, Ferrazzoli, Riccardo, additional, Garcia, Javier A., additional, Gunji, Shuichi, additional, Hayashida, Kiyoshi, additional, Iwakiri, Wataru, additional, Jorstad, Svetlana G., additional, Karas, Vladimir, additional, Kitaguchi, Takao, additional, Kolodziejczak, Jeffery J., additional, Krawczynski, Henric, additional, Monaca, Fabio La, additional, Latronico, Luca, additional, Liodakis, Ioannis, additional, Maldera, Simone, additional, Manfreda, Alberto, additional, Marin, Frédéric, additional, Marinucci, Andrea, additional, Marscher, Alan P., additional, Matt, Giorgio, additional, Mitsuishi, Ikuyuki, additional, Mizuno, Tsunefumi, additional, Muleri, Fabio, additional, Ng, C.-Y., additional, O’Dell, Stephen L., additional, Omodei, Nicola, additional, Oppedisano, Chiara, additional, Papitto, Alessandro, additional, Pavlov, George G., additional, Peirson, Abel L., additional, Perri, Matteo, additional, Pesce-Rollins, Melissa, additional, Petrucci, Pierre-Olivier, additional, Pilia, Maura, additional, Possenti, Andrea, additional, Puccetti, Simonetta, additional, Ramsey, Brian D., additional, Rankin, John, additional, Ratheesh, Ajay, additional, Romani, Roger W., additional, Sgrò, Carmelo, additional, Slane, Patrick, additional, Soffitta, Paolo, additional, Spandre, Gloria, additional, Tamagawa, Toru, additional, Tavecchio, Fabrizio, additional, Taverna, Roberto, additional, Tawara, Yuzuru, additional, Tennant, Allyn F., additional, Thomas, Nicholas E., additional, Tombesi, Francesco, additional, Trois, Alessio, additional, Turolla, Roberto, additional, Vink, Jacco, additional, Weisskopf, Martin C., additional, Wu, Kinwah, additional, Xie, Fei, additional, Schulz, Norbert S., additional, and Chakrabarty, Deepto, additional

Published
2022
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61. The Discovery of the 528.6 Hz Accreting Millisecond X-Ray Pulsar MAXI J1816–195

Author

Bult, Peter, primary, Altamirano, Diego, additional, Arzoumanian, Zaven, additional, Chakrabarty, Deepto, additional, Chenevez, Jérôme, additional, Ferrara, Elizabeth C., additional, Gendreau, Keith C., additional, Guillot, Sebastien, additional, Güver, Tolga, additional, Iwakiri, Wataru, additional, Jaisawal, Gaurava K., additional, Mancuso, Giulio C., additional, Malacaria, Christian, additional, Ng, Mason, additional, Sanna, Andrea, additional, Strohmayer, Tod E., additional, Wadiasingh, Zorawar, additional, and Wolff, Michael T., additional

Published
2022
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62. SRGA J181414.6-225604: A New Galactic Symbiotic X-Ray Binary Outburst Triggered by an Intense Mass-loss Episode of a Heavily Obscured Mira Variable

Author

De, Kishalay, primary, Mereminskiy, Ilya, additional, Soria, Roberto, additional, Conroy, Charlie, additional, Kara, Erin, additional, Anand, Shreya, additional, Ashley, Michael C. B., additional, Boyer, Martha L., additional, Chakrabarty, Deepto, additional, Grefenstette, Brian, additional, Hankins, Matthew J., additional, Hillenbrand, Lynne A., additional, Jencson, Jacob E., additional, Karambelkar, Viraj, additional, Kasliwal, Mansi M., additional, Lau, Ryan M., additional, Lutovinov, Alexander, additional, Moore, Anna M., additional, Ng, Mason, additional, Panagiotou, Christos, additional, Pasham, Dheeraj R., additional, Semena, Andrey, additional, Simcoe, Robert, additional, Soon, Jamie, additional, Srinivasaragavan, Gokul P., additional, Travouillon, Tony, additional, and Yao, Yuhan, additional

Published
2022
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63. Burst–Disk Interaction in 4U 1636–536 as Observed by NICER

Author

Güver, Tolga, primary, Bostancı, Z. Funda, additional, Boztepe, Tuğba, additional, Göğüş, Ersin, additional, Bult, Peter, additional, Kashyap, Unnati, additional, Chakraborty, Manoneeta, additional, Ballantyne, David R., additional, Ludlam, R. M., additional, Malacaria, C., additional, Jaisawal, Gaurava K., additional, Strohmayer, Tod E., additional, Guillot, Sebastien, additional, and Ng, Mason, additional

Published
2022
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64. NICER Discovery of Millisecond X-Ray Pulsations and an Ultracompact Orbit in IGR J17494-3030

Author

MIT Kavli Institute for Astrophysics and Space Research, Ng, Mason, Ray, Paul S., Bult, Peter, Chakrabarty, Deepto, Jaisawal, Gaurava K., Malacaria, Christian, Altamirano, Diego, Arzoumanian, Zaven, Gendreau, Keith C., Güver, Tolga, Kerr, Matthew, Strohmayer, Tod E., Wadiasingh, Zorawar, Wolff, Michael T., MIT Kavli Institute for Astrophysics and Space Research, Ng, Mason, Ray, Paul S., Bult, Peter, Chakrabarty, Deepto, Jaisawal, Gaurava K., Malacaria, Christian, Altamirano, Diego, Arzoumanian, Zaven, Gendreau, Keith C., Güver, Tolga, Kerr, Matthew, Strohmayer, Tod E., Wadiasingh, Zorawar, and Wolff, Michael T.

Published
2022

65. NICER Discovery of Millisecond X-Ray Pulsations and an Ultracompact Orbit in IGR J17494-3030

Author

Ng, Mason, Ray, Paul S, Bult, Peter, Chakrabarty, Deepto, Jaisawal, Gaurava K, Malacaria, Christian, Altamirano, Diego, Arzoumanian, Zaven, Gendreau, Keith C, Güver, Tolga, Kerr, Matthew, Strohmayer, Tod E, Wadiasingh, Zorawar, Wolff, Michael T, Ng, Mason, Ray, Paul S, Bult, Peter, Chakrabarty, Deepto, Jaisawal, Gaurava K, Malacaria, Christian, Altamirano, Diego, Arzoumanian, Zaven, Gendreau, Keith C, Güver, Tolga, Kerr, Matthew, Strohmayer, Tod E, Wadiasingh, Zorawar, and Wolff, Michael T

Published
2022

66. Burst–Disk Interaction in 4U 1636–536 as Observed by NICER

Author

Güver, Tolga, Bostancı, Z. Funda, Boztepe, Tuğba, Göğüş, Ersin, Bult, Peter, Kashyap, Unnati, Chakraborty, Manoneeta, Ballantyne, David R., Ludlam, R. M., Malacaria, C., Jaisawal, Gaurava K., Strohmayer, Tod E., Guillot, Sebastien, Ng, Mason, Güver, Tolga, Bostancı, Z. Funda, Boztepe, Tuğba, Göğüş, Ersin, Bult, Peter, Kashyap, Unnati, Chakraborty, Manoneeta, Ballantyne, David R., Ludlam, R. M., Malacaria, C., Jaisawal, Gaurava K., Strohmayer, Tod E., Guillot, Sebastien, and Ng, Mason

Abstract

We present the detection of 51 thermonuclear X-ray bursts observed from 4U 1636–536 by the Neutron Star Interior Composition Explorer (NICER) over the course of a 3 yr monitoring campaign. We perform time-resolved spectroscopy for 40 of these bursts and show the existence of a strong soft excess in all the burst spectra. The excess emission can be characterized by the use of a scaling factor (the fa method) to the persistent emission of the source, which is attributed to the increased mass accretion rate onto the neutron star due to Poynting–Robertson drag. The soft excess emission can also be characterized by the use of a model taking into account the reflection of the burst emission off the accretion disk. We also present time-resolved spectral analysis of five X-ray bursts simultaneously observed by NICER and AstroSat, which confirm the main results with even greater precision. Finally, we present evidence for Compton cooling using seven X-ray bursts observed contemporaneously with NuSTAR, by means of a correlated decrease in the hard X-ray lightcurve of 4U 1636–536 as the bursts start.

Published
2022

67. The X-Ray Bursts of XTE J1739–285: A NICER Sample

Author

Bult, Peter, Altamirano, Diego, Arzoumanian, Zaven, Bilous, Anna V, Chakrabarty, Deepto, Gendreau, Keith C, Güver, Tolga, Jaisawal, Gaurava K, Kuulkers, Erik, Malacaria, Christian, Ng, Mason, Sanna, Andrea, Strohmayer, Tod E, Bult, Peter, Altamirano, Diego, Arzoumanian, Zaven, Bilous, Anna V, Chakrabarty, Deepto, Gendreau, Keith C, Güver, Tolga, Jaisawal, Gaurava K, Kuulkers, Erik, Malacaria, Christian, Ng, Mason, Sanna, Andrea, and Strohmayer, Tod E

Abstract

© 2021. The American Astronomical Society. All rights reserved.. In this work, we report on observations with the Neutron Star Interior Composition Explorer of the known neutron star X-ray transient XTE J1739-285. We observed the source in 2020 February and March, finding it in a highly active bursting state. Across a 20 day period, we detected 32 thermonuclear X-ray bursts, with an average burst recurrence time of 2.0-0.3+0.4 hr. A timing and spectral analysis of the ensemble of X-ray bursts reveals homogeneous burst properties, evidence for short-recurrence time bursts, and the detection of a 386.5 Hz burst oscillation candidate. The latter is especially notable, given that a previous study of this source claimed a 1122 Hz burst oscillation candidate. We did not find any evidence of variability near 1122 Hz and instead find that the 386.5 Hz oscillation is the more prominent signal of the two burst oscillation candidates. Hence, we conclude it is unlikely that XTE J1739-285 has a submillisecond rotation period.

Published
2022

68. Evidence for a compact object in the aftermath of the extragalactic transient AT2018cow

Author

MIT Kavli Institute for Astrophysics and Space Research, Pasham, Dheeraj R, Ho, Wynn CG, Alston, William, Remillard, Ronald, Ng, Mason, Gendreau, Keith, Metzger, Brian D, Altamirano, Diego, Chakrabarty, Deepto, Fabian, Andrew, Miller, Jon, Bult, Peter, Arzoumanian, Zaven, Steiner, James F, Strohmayer, Tod, Tombesi, Francesco, Homan, Jeroen, Cackett, Edward M, Harding, Alice, MIT Kavli Institute for Astrophysics and Space Research, Pasham, Dheeraj R, Ho, Wynn CG, Alston, William, Remillard, Ronald, Ng, Mason, Gendreau, Keith, Metzger, Brian D, Altamirano, Diego, Chakrabarty, Deepto, Fabian, Andrew, Miller, Jon, Bult, Peter, Arzoumanian, Zaven, Steiner, James F, Strohmayer, Tod, Tombesi, Francesco, Homan, Jeroen, Cackett, Edward M, and Harding, Alice

Abstract

The brightest Fast Blue Optical Transients (FBOTs) are mysterious extragalactic explosions that may represent a new class of astrophysical phenomena. Their fast time to maximum brightness of less than a week and decline over several months and atypical optical spectra and evolution are difficult to explain within the context of core-collapse of massive stars which are powered by radioactive decay of Nickel-56 and evolve more slowly. AT2018cow (at redshift of 0.014) is an extreme FBOT in terms of rapid evolution and high luminosities. Here we present evidence for a high-amplitude quasi-periodic oscillation (QPO) of AT2018cow's soft X-rays with a frequency of 224 Hz (at 3.7$\sigma$ significance level or false alarm probability of 0.02%) and fractional root-mean-squared amplitude of >30%. This signal is found in the average power density spectrum taken over the entire 60-day outburst and suggests a highly persistent signal that lasts for a billion cycles. The high frequency (rapid timescale) of 224 Hz (4.4 ms) argues for a compact object in AT2018cow, which can be a neutron star or black hole with a mass less than 850 solar masses. If the QPO is the spin period of a neutron star, we can set limits on the star's magnetic field strength. Our work highlights a new way of using high time-resolution X-ray observations to study FBOTs.

Published
2022

69. The X-Ray Bursts of XTE J1739–285: A NICER Sample

Author

MIT Kavli Institute for Astrophysics and Space Research, Bult, Peter, Altamirano, Diego, Arzoumanian, Zaven, Bilous, Anna V., Chakrabarty, Deepto, Gendreau, Keith C., Güver, Tolga, Jaisawal, Gaurava K., Kuulkers, Erik, Malacaria, Christian, Ng, Mason, Sanna, Andrea, Strohmayer, Tod E., MIT Kavli Institute for Astrophysics and Space Research, Bult, Peter, Altamirano, Diego, Arzoumanian, Zaven, Bilous, Anna V., Chakrabarty, Deepto, Gendreau, Keith C., Güver, Tolga, Jaisawal, Gaurava K., Kuulkers, Erik, Malacaria, Christian, Ng, Mason, Sanna, Andrea, and Strohmayer, Tod E.

Abstract

© 2021. The American Astronomical Society. All rights reserved.. In this work, we report on observations with the Neutron Star Interior Composition Explorer of the known neutron star X-ray transient XTE J1739-285. We observed the source in 2020 February and March, finding it in a highly active bursting state. Across a 20 day period, we detected 32 thermonuclear X-ray bursts, with an average burst recurrence time of 2.0-0.3+0.4 hr. A timing and spectral analysis of the ensemble of X-ray bursts reveals homogeneous burst properties, evidence for short-recurrence time bursts, and the detection of a 386.5 Hz burst oscillation candidate. The latter is especially notable, given that a previous study of this source claimed a 1122 Hz burst oscillation candidate. We did not find any evidence of variability near 1122 Hz and instead find that the 386.5 Hz oscillation is the more prominent signal of the two burst oscillation candidates. Hence, we conclude it is unlikely that XTE J1739-285 has a submillisecond rotation period.

Published
2022

70. A Month of Monitoring the New Magnetar Swift J1555.2−5402 during an X-Ray Outburst

Author

MIT Kavli Institute for Astrophysics and Space Research, Enoto, Teruaki, Ng, Mason, Hu, Chin-Ping, Güver, Tolga, Jaisawal, Gaurava K, O’Connor, Brendan, Göğüş, Ersin, Lien, Amy, Kisaka, Shota, Wadiasingh, Zorawar, Majid, Walid A, Pearlman, Aaron B, Arzoumanian, Zaven, Bansal, Karishma, Blumer, Harsha, Chakrabarty, Deepto, Gendreau, Keith, Ho, Wynn CG, Kouveliotou, Chryssa, Ray, Paul S, Strohmayer, Tod E, Younes, George, Palmer, David M, Sakamoto, Takanori, Akahori, Takuya, Eie, Sujin, MIT Kavli Institute for Astrophysics and Space Research, Enoto, Teruaki, Ng, Mason, Hu, Chin-Ping, Güver, Tolga, Jaisawal, Gaurava K, O’Connor, Brendan, Göğüş, Ersin, Lien, Amy, Kisaka, Shota, Wadiasingh, Zorawar, Majid, Walid A, Pearlman, Aaron B, Arzoumanian, Zaven, Bansal, Karishma, Blumer, Harsha, Chakrabarty, Deepto, Gendreau, Keith, Ho, Wynn CG, Kouveliotou, Chryssa, Ray, Paul S, Strohmayer, Tod E, Younes, George, Palmer, David M, Sakamoto, Takanori, Akahori, Takuya, and Eie, Sujin

Published
2022

71. Evidence for a compact object in the aftermath of the extragalactic transient AT2018cow

Author

Pasham, Dheeraj R., primary, Ho, Wynn C. G., additional, Alston, William, additional, Remillard, Ronald, additional, Ng, Mason, additional, Gendreau, Keith, additional, Metzger, Brian D., additional, Altamirano, Diego, additional, Chakrabarty, Deepto, additional, Fabian, Andrew, additional, Miller, Jon, additional, Bult, Peter, additional, Arzoumanian, Zaven, additional, Steiner, James F., additional, Strohmayer, Tod, additional, Tombesi, Francesco, additional, Homan, Jeroen, additional, Cackett, Edward M., additional, and Harding, Alice, additional

Published
2021
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72. A Month of Monitoring the New Magnetar Swift J1555.2−5402 during an X-Ray Outburst

Author

Enoto, Teruaki, primary, Ng, Mason, additional, Hu, Chin-Ping, additional, Güver, Tolga, additional, Jaisawal, Gaurava K., additional, O’Connor, Brendan, additional, Göğüş, Ersin, additional, Lien, Amy, additional, Kisaka, Shota, additional, Wadiasingh, Zorawar, additional, Majid, Walid A., additional, Pearlman, Aaron B., additional, Arzoumanian, Zaven, additional, Bansal, Karishma, additional, Blumer, Harsha, additional, Chakrabarty, Deepto, additional, Gendreau, Keith, additional, Ho, Wynn C. G., additional, Kouveliotou, Chryssa, additional, Ray, Paul S., additional, Strohmayer, Tod E., additional, Younes, George, additional, Palmer, David M., additional, Sakamoto, Takanori, additional, Akahori, Takuya, additional, and Eie, Sujin, additional

Published
2021
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73. A Comprehensive X-Ray Report on AT2019wey

Author

Yao, Yuhan, primary, Kulkarni, S. R., additional, Gendreau, K. C., additional, Jaisawal, Gaurava K., additional, Enoto, Teruaki, additional, Grefenstette, Brian W., additional, Marshall, Herman L., additional, García, Javier A., additional, Ludlam, R. M., additional, Pike, Sean N., additional, Ng, Mason, additional, Zhang, Liang, additional, Altamirano, Diego, additional, Jaodand, Amruta, additional, Cenko, S. Bradley, additional, Remillard, Ronald A., additional, Steiner, James F., additional, Negoro, Hitoshi, additional, Brightman, Murray, additional, Lien, Amy, additional, Wolff, Michael T., additional, Ray, Paul S., additional, Mukai, Koji, additional, Wadiasingh, Zorawar, additional, Arzoumanian, Zaven, additional, Kawai, Nobuyki, additional, Mihara, Tatehiro, additional, and Strohmayer, Tod E., additional

Published
2021
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74. A Comprehensive X-Ray Report on AT2019wey

Author

Yao, Yuhan, Kulkarni, S. R., Gendreau, K. C., Jaisawal, Gaurava K., Enoto, Teruaki, Grefenstette, Brian W., Marshall, Herman L., García, Javier A., Ludlam, R. M., Pike, Sean N., Ng, Mason, Zhang, Liang, Altamirano, Diego, Jaodand, Amruta, Cenko, S. Bradley, Remillard, Ronald A., Steiner, James F., Negoro, Hitoshi, Brightman, Murray, Lien, Amy, Wolff, Michael T., Ray, Paul S., Mukai, Koji, Wadiasingh, Zorawar, Arzoumanian, Zaven, Kawai, Nobuyki, Mihara, Tatehiro, Strohmayer, Tod E., Yao, Yuhan, Kulkarni, S. R., Gendreau, K. C., Jaisawal, Gaurava K., Enoto, Teruaki, Grefenstette, Brian W., Marshall, Herman L., García, Javier A., Ludlam, R. M., Pike, Sean N., Ng, Mason, Zhang, Liang, Altamirano, Diego, Jaodand, Amruta, Cenko, S. Bradley, Remillard, Ronald A., Steiner, James F., Negoro, Hitoshi, Brightman, Murray, Lien, Amy, Wolff, Michael T., Ray, Paul S., Mukai, Koji, Wadiasingh, Zorawar, Arzoumanian, Zaven, Kawai, Nobuyki, Mihara, Tatehiro, and Strohmayer, Tod E.

Published
2021

75. Initial results of a NICER X-ray monitoring of the magnetar, Swift J1555.2-5402

Author

Enoto, Teruaki, Ng, Mason, Hu, Chin-Ping, Bansal, Karishma, Gendreau, Keith, Arzoumanian, Zaven, Strohmayer, Tod, Wadiasingh , Zorawar, Guver, Tolga, B. Pearlman, Aaron, Majid, Walid A., Kouveliotou, Chryssa, Coti Zelati, Francesco, Borghese, Alice, Rea , Nanda, Luca Israel, Gian, Esposito, Paolo, Jaisawal, Gaurava K., Enoto, Teruaki, Ng, Mason, Hu, Chin-Ping, Bansal, Karishma, Gendreau, Keith, Arzoumanian, Zaven, Strohmayer, Tod, Wadiasingh , Zorawar, Guver, Tolga, B. Pearlman, Aaron, Majid, Walid A., Kouveliotou, Chryssa, Coti Zelati, Francesco, Borghese, Alice, Rea , Nanda, Luca Israel, Gian, Esposito, Paolo, and Jaisawal, Gaurava K.

Abstract

Following Swift’s discovery of a new magnetar candidate, Swift J1555.2-5402, on June 3, 2021 (GCN circular 30120, 30124), NICER discovered a 3.86-sec periodicity from this source (GCN 30121). NICER has been monitoring Swift J1555.2-5402 since 13:43 UT on June 3 with a total 4.2 ks exposure as of 11:48 UT June 4. Here we report refined timing analyses after barycentric correction, as well as on the X-ray spectral and bursting properties of this source. The background-subtracted average source count rate is 3.69 cps in the 1-10 keV band. After barycentric correction of the event data at the reported coordinates (RA: 15:55:08.66s, Dec: -54:03:41.1) in GCN 30122, we found a coherent periodicity at 0.2590004(17) Hz with a significance of approximately 30 sigma. The X-ray pulse profile has a single peak. Its period derivative has yet to be measured. The NICER 1-10 keV spectrum can be approximated by an absorbed blackbody model, with best fit spectral parameters N_H=(7.7 +/- 0.3)e+22 cm-2, kT=1.24 +/- 0.03 keV, with an apparent emitting radius at 10 kpc of R=1.8 +/- 0.1 km. The absorbed and unabsorbed X-ray fluxes of the source in the same energy range are (4.4 +/- 0.1)e-11 and (6.94 +/- 0.12)e-11 ergs/s/cm2, respectively. Errors represent 1 sigma uncertainties. These parameters are in the range of known magnetars in outburst. We detected four short burst (< 1 s) candidates with significance > 5 sigma during the observation. The source is still active, and multiwavelength coordinated observations are encouraged. All these results confirm that Swift J1555.2-5402 is a new magnetar in outburst. The NICER team is planning to monitor this target to measure its spin-down rate and flux decay. NICER is a 0.2-12 keV X-ray telescope operating on the International Space Station. The NICER mission and portions of the NICER science team activities are funded by NASA.

Published
2021

76. The X-Ray Bursts of XTE J1739–285: A NICER Sample

Author

Bult, Peter, Altamirano, Diego, Arzoumanian, Zaven, Bilous, Anna V., Chakrabarty, Deepto, Gendreau, Keith C., Güver, Tolga, Jaisawal, Gaurava K., Kuulkers, Erik, Malacaria, Christian, Ng, Mason, Sanna, Andrea, Strohmayer, Tod E., Bult, Peter, Altamirano, Diego, Arzoumanian, Zaven, Bilous, Anna V., Chakrabarty, Deepto, Gendreau, Keith C., Güver, Tolga, Jaisawal, Gaurava K., Kuulkers, Erik, Malacaria, Christian, Ng, Mason, Sanna, Andrea, and Strohmayer, Tod E.

Abstract

In this work, we report on observations with the Neutron Star Interior Composition Explorer of the known neutron star X-ray transient XTE J1739–285. We observed the source in 2020 February and March, finding it in a highly active bursting state. Across a 20 day period, we detected 32 thermonuclear X-ray bursts, with an average burst recurrence time of . A timing and spectral analysis of the ensemble of X-ray bursts reveals homogeneous burst properties, evidence for short-recurrence time bursts, and the detection of a 386.5 Hz burst oscillation candidate. The latter is especially notable, given that a previous study of this source claimed a 1122 Hz burst oscillation candidate. We did not find any evidence of variability near 1122 Hz and instead find that the 386.5 Hz oscillation is the more prominent signal of the two burst oscillation candidates. Hence, we conclude it is unlikely that XTE J1739–285 has a submillisecond rotation period.

Published
2021

77. Evidence for a Compact Object in the Aftermath of the Extra-Galactic Transient AT2018cow

Author

Pasham, Dheeraj, primary, Ho, Wynn, additional, Alston, William, additional, Remillard, Ronald, additional, Ng, Mason, additional, Gendreau, Keith, additional, Metzger, Brian, additional, Altamirano, Diego, additional, Chakrabarty, Deepto, additional, Fabian, Andrew, additional, Miller, Jon, additional, Bult, Peter, additional, Arzoumanian, Zaven, additional, Steiner, James, additional, Strohmayer, Tod, additional, Tombesi, Francesco, additional, Homan, Jeroen, additional, Cackett, Edward, additional, and Harding, Alice, additional

Published
2021
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79. NICER Discovery of Millisecond X-Ray Pulsations and an Ultracompact Orbit in IGR J17494-3030

Author

Ng, Mason, primary, Ray, Paul S., additional, Bult, Peter, additional, Chakrabarty, Deepto, additional, Jaisawal, Gaurava K., additional, Malacaria, Christian, additional, Altamirano, Diego, additional, Arzoumanian, Zaven, additional, Gendreau, Keith C., additional, Güver, Tolga, additional, Kerr, Matthew, additional, Strohmayer, Tod E., additional, Wadiasingh, Zorawar, additional, and Wolff, Michael T., additional

Published
2021
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80. The X-Ray Bursts of XTE J1739–285: A NICER Sample

Author

Bult, Peter, primary, Altamirano, Diego, additional, Arzoumanian, Zaven, additional, Bilous, Anna V., additional, Chakrabarty, Deepto, additional, Gendreau, Keith C., additional, Güver, Tolga, additional, Jaisawal, Gaurava K., additional, Kuulkers, Erik, additional, Malacaria, Christian, additional, Ng, Mason, additional, Sanna, Andrea, additional, and Strohmayer, Tod E., additional

Published
2021
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82. A Review of Recent Advances in Automated Guided Vehicle Technologies: Integration Challenges and Research Areas for 5G-Based Smart Manufacturing Applications

Author

Oyekanlu, Emmanuel A., primary, Smith, Alexander C., additional, Thomas, Windsor P., additional, Mulroy, Grethel, additional, Hitesh, Dave, additional, Ramsey, Matthew, additional, Kuhn, David J., additional, Mcghinnis, Jason D., additional, Buonavita, Steven C., additional, Looper, Nickolus A., additional, Ng, Mason, additional, Ng'oma, Anthony, additional, Liu, Weimin, additional, Mcbride, Patrick G., additional, Shultz, Michael G., additional, Cerasi, Craig, additional, and Sun, Dan, additional

Published
2020
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84. The sommelier suggests... We invite a leading sommelier to pick a go-to, personal favourite grape variety or wine style.

Author

Ng, Mason

Subjects
GRAPE varieties, PINOT noir, BURGUNDY wines, CLIMATE change, WINE industry
Abstract

The article highlights the wines of Jura in eastern France, particularly the red wines made from native grape varieties like Pinot Noir, Ploussard, and Trousseau. It emphasizes that these red wines provide an elegant and lighter alternative, especially in the context of rising prices and changing styles in Burgundy due to climate change.

Published
2023

85. A polarimetrically oriented X-ray stare at the accreting pulsar EXO 2030+375

Author

Christian Malacaria, Jeremy Heyl, Victor Doroshenko, Sergey S. Tsygankov, Juri Poutanen, Sofia V. Forsblom, Fiamma Capitanio, Alessandro Di Marco, Yujia Du, Lorenzo Ducci, Fabio La Monaca, Alexander A. Lutovinov, Herman L. Marshall, Ilya A. Mereminskiy, Sergey V. Molkov, Alexander A. Mushtukov, Mason Ng, Pierre-Olivier Petrucci, Andrea Santangelo, Andrey E. Shtykovsky, Valery F. Suleimanov, Iv??n Agudo, Lucio A. Antonelli, Matteo Bachetti, Luca Baldini, Wayne H. Baumgartner, Ronaldo Bellazzini, Stefano Bianchi, Stephen D. Bongiorno, Raffaella Bonino, Alessandro Brez, Niccol?? Bucciantini, Simone Castellano, Elisabetta Cavazzuti, Chien-Ting Chen, Stefano Ciprini, Enrico Costa, Alessandra De Rosa, Ettore Del Monte, Laura Di Gesu, Niccol?? Di Lalla, Immacolata Donnarumma, Michal Dov??iak, Steven R. Ehlert, Teruaki Enoto, Yuri Evangelista, Sergio Fabiani, Riccardo Ferrazzoli, Javier A. Garcia, Shuichi Gunji, Kiyoshi Hayashida, Wataru Iwakiri, Svetlana G. Jorstad, Philip Kaaret, Vladimir Karas, Fabian Kislat, Takao Kitaguchi, Jeffery J. Kolodziejczak, Henric Krawczynski, Luca Latronico, Ioannis Liodakis, Simone Maldera, Alberto Manfreda, Fr??d??ric Marin, Andrea Marinucci, Alan P. Marscher, Francesco Massaro, Giorgio Matt, Ikuyuki Mitsuishi, Tsunefumi Mizuno, Fabio Muleri, Michela Negro, Chi-Yung Ng, Stephen L. O???Dell, Nicola Omodei, Chiara Oppedisano, Alessandro Papitto, George G. Pavlov, Abel L. Peirson, Matteo Perri, Melissa Pesce-Rollins, Maura Pilia, Andrea Possenti, Simonetta Puccetti, Brian D. Ramsey, John Rankin, Ajay Ratheesh, Oliver J. Roberts, Roger W. Romani, Carmelo Sgr??, Patrick Slane, Paolo Soffitta, Gloria Spandre, Douglas A. Swartz, Toru Tamagawa, Fabrizio Tavecchio, Roberto Taverna, Yuzuru Tawara, Allyn F. Tennant, Nicholas E. Thomas, Francesco Tombesi, Alessio Trois, Roberto Turolla, Jacco Vink, Martin C. Weisskopf, Kinwah Wu, Fei Xie, Silvia Zane, Malacaria, Christian, Heyl, Jeremy, Doroshenko, Victor, Tsygankov, Sergey S., Poutanen, Juri, Forsblom, Sofia V., Capitanio, Fiamma, Di Marco, Alessandro, Du, Yujia, Ducci, Lorenzo, La Monaca, Fabio, Lutovinov, Alexander A., Marshall, Herman L., Mereminskiy, Ilya A., Molkov, Sergey V., Mushtukov, Alexander A., Ng, Mason, Petrucci, PIERRE-OLIVIER, Santangelo, Andrea, Shtykovsky, Andrey E., Suleimanov, Valery F., Agudo, Iv??n, Antonelli, Lucio A., Bachetti, Matteo, Baldini, Luca, Baumgartner, Wayne H., Bellazzini, Ronaldo, Bianchi, Stefano, Bongiorno, Stephen D., Bonino, Raffaella, Brez, Alessandro, Bucciantini, Niccol??, Castellano, Simone, Cavazzuti, Elisabetta, Chen, Chien-Ting, Ciprini, Stefano, Costa, Enrico, DE ROSA, Alessandra, Del Monte, Ettore, Di Gesu, Laura, Di Lalla, Niccol??, Donnarumma, Immacolata, Dov??iak, Michal, Ehlert, Steven R., Enoto, Teruaki, Evangelista, Yuri, Fabiani, Sergio, Ferrazzoli, Riccardo, Garcia, Javier A., Gunji, Shuichi, Hayashida, Kiyoshi, Iwakiri, Wataru, Jorstad, Svetlana G., Kaaret, Philip, Karas, Vladimir, Kislat, Fabian, Kitaguchi, Takao, Kolodziejczak, Jeffery J., Krawczynski, Henric, Latronico, Luca, Liodakis, Ioanni, Maldera, Simone, Manfreda, Alberto, Marin, Fr??d??ric, Marinucci, Andrea, Marscher, Alan P., Massaro, Francesco, Matt, Giorgio, Mitsuishi, Ikuyuki, Mizuno, Tsunefumi, Muleri, Fabio, Negro, Michela, Ng, Chi-Yung, O???dell, Stephen L., Omodei, Nicola, Oppedisano, Chiara, Papitto, Alessandro, Pavlov, George G., Peirson, Abel L., Perri, Matteo, Pesce-Rollins, Melissa, Pilia, Maura, Possenti, Andrea, Puccetti, Simonetta, Ramsey, Brian D., Rankin, John, Ratheesh, Ajay, Roberts, Oliver J., Romani, Roger W., Sgr??, Carmelo, Slane, Patrick, Soffitta, Paolo, Spandre, Gloria, Swartz, Douglas A., Tamagawa, Toru, Tavecchio, Fabrizio, Taverna, Roberto, Tawara, Yuzuru, Tennant, Allyn F., Thomas, Nicholas E., Tombesi, Francesco, Trois, Alessio, Turolla, Roberto, Vink, Jacco, Weisskopf, Martin C., Wu, Kinwah, Xie, Fei, and Zane, Silvia

Published
2023

86. Polarized x-rays from a magnetar

Author

Roberto Taverna, Roberto Turolla, Fabio Muleri, Jeremy Heyl, Silvia Zane, Luca Baldini, Denis González-Caniulef, Matteo Bachetti, John Rankin, Ilaria Caiazzo, Niccolò Di Lalla, Victor Doroshenko, Manel Errando, Ephraim Gau, Demet Kırmızıbayrak, Henric Krawczynski, Michela Negro, Mason Ng, Nicola Omodei, Andrea Possenti, Toru Tamagawa, Keisuke Uchiyama, Martin C. Weisskopf, Ivan Agudo, Lucio A. Antonelli, Wayne H. Baumgartner, Ronaldo Bellazzini, Stefano Bianchi, Stephen D. Bongiorno, Raffaella Bonino, Alessandro Brez, Niccolò Bucciantini, Fiamma Capitanio, Simone Castellano, Elisabetta Cavazzuti, Stefano Ciprini, Enrico Costa, Alessandra De Rosa, Ettore Del Monte, Laura Di Gesu, Alessandro Di Marco, Immacolata Donnarumma, Michal Dovčiak, Steven R. Ehlert, Teruaki Enoto, Yuri Evangelista, Sergio Fabiani, Riccardo Ferrazzoli, Javier A. Garcia, Shuichi Gunji, Kiyoshi Hayashida, Wataru Iwakiri, Svetlana G. Jorstad, Vladimir Karas, Takao Kitaguchi, Jeffery J. Kolodziejczak, Fabio La Monaca, Luca Latronico, Ioannis Liodakis, Simone Maldera, Alberto Manfreda, Frédéric Marin, Andrea Marinucci, Alan P. Marscher, Herman L. Marshall, Giorgio Matt, Ikuyuki Mitsuishi, Tsunefumi Mizuno, Stephen C.-Y. Ng, Stephen L. O’Dell, Chiara Oppedisano, Alessandro Papitto, George G. Pavlov, Abel L. Peirson, Matteo Perri, Melissa Pesce-Rollins, Maura Pilia, Juri Poutanen, Simonetta Puccetti, Brian D. Ramsey, Ajay Ratheesh, Roger W. Romani, Carmelo Sgrò, Patrick Slane, Paolo Soffitta, Gloria Spandre, Fabrizio Tavecchio, Yuzuru Tawara, Allyn F. Tennant, Nicholas E. Thomas, Francesco Tombesi, Alessio Trois, Sergey S. Tsygankov, Jacco Vink, Kinwah Wu, Fei Xie, Taverna, Roberto, Turolla, Roberto, Muleri, Fabio, Heyl, Jeremy, Zane, Silvia, Baldini, Luca, González-Caniulef, Deni, Bachetti, Matteo, Rankin, John, Caiazzo, Ilaria, Di Lalla, Niccolò, Doroshenko, Victor, Errando, Manel, Gau, Ephraim, Kırmızıbayrak, Demet, Krawczynski, Henric, Negro, Michela, Ng, Mason, Omodei, Nicola, Possenti, Andrea, Tamagawa, Toru, Uchiyama, Keisuke, Weisskopf, Martin C., Agudo, Ivan, Antonelli, Lucio A., Baumgartner, Wayne H., Bellazzini, Ronaldo, Bianchi, Stefano, Bongiorno, Stephen D., Bonino, Raffaella, Brez, Alessandro, Bucciantini, Niccolò, Capitanio, Fiamma, Castellano, Simone, Cavazzuti, Elisabetta, Ciprini, Stefano, Costa, Enrico, De Rosa, Alessandra, Del Monte, Ettore, Di Gesu, Laura, Di Marco, Alessandro, Donnarumma, Immacolata, Dovčiak, Michal, Ehlert, Steven R., Enoto, Teruaki, Evangelista, Yuri, Fabiani, Sergio, Ferrazzoli, Riccardo, Garcia, Javier A., Gunji, Shuichi, Hayashida, Kiyoshi, Iwakiri, Wataru, Jorstad, Svetlana G., Karas, Vladimir, Kitaguchi, Takao, Kolodziejczak, Jeffery J., La Monaca, Fabio, Latronico, Luca, Liodakis, Ioanni, Maldera, Simone, Manfreda, Alberto, Marin, Frédéric, Marinucci, Andrea, Marscher, Alan P., Marshall, Herman L., Matt, Giorgio, Mitsuishi, Ikuyuki, Mizuno, Tsunefumi, Ng, Stephen C. -Y., O’Dell, Stephen L., Oppedisano, Chiara, Papitto, Alessandro, Pavlov, George G., Peirson, Abel L., Perri, Matteo, Pesce-Rollins, Melissa, Pilia, Maura, Poutanen, Juri, Puccetti, Simonetta, Ramsey, Brian D., Ratheesh, Ajay, Romani, Roger W., Sgrò, Carmelo, Slane, Patrick, Soffitta, Paolo, Spandre, Gloria, Tavecchio, Fabrizio, Tawara, Yuzuru, Tennant, Allyn F., Thomas, Nicholas E., Tombesi, Francesco, Trois, Alessio, Tsygankov, Sergey S., Vink, Jacco, Wu, Kinwah, Xie, Fei, High Energy Astrophys. & Astropart. Phys (API, FNWI), Ministerio de Ciencia e Innovación (España), and Natural Sciences and Engineering Research Council of Canada

Subjects
High Energy Astrophysical Phenomena (astro-ph.HE), Multidisciplinary, Settore FIS/05, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Astrophysics - High Energy Astrophysical Phenomena
Abstract

Full list of authors: Taverna, Roberto; Turolla, Roberto; Muleri, Fabio; Heyl, Jeremy; Zane, Silvia; Baldini, Luca; Gonzalez-Caniulef, Denis; Bachetti, Matteo; Rankin, John; Caiazzo, Ilaria; Di Lalla, Niccolo; Doroshenko, Victor; Errando, Manel; Gau, Ephraim; Kirmizibayrak, Demet; Krawczynski, Henric; Negro, Michela; Ng, Mason; Omodei, Nicola; Possenti, Andrea; Tamagawa, Toru; Uchiyama, Keisuke; Weisskopf, Martin C.; Agudo, Ivan; Antonelli, Lucio A.; Baumgartner, Wayne H.; Bellazzini, Ronaldo; Bianchi, Stefano; Bongiorno, Stephen D.; Bonino, Raffaella; Brez, Alessandro; Bucciantini, Niccolo; Capitanio, Fiamma; Castellano, Simone; Cavazzuti, Elisabetta; Ciprini, Stefano; Costa, Enrico; De Rosa, Alessandra; Del Monte, Ettore; Di Gesu, Laura; Di Marco, Alessandro; Donnarumma, Immacolata; Doviak, Michal; Ehlert, Steven R.; Enoto, Teruaki; Evangelista, Yuri; Fabiani, Sergio; Ferrazzoli, Riccardo; Garcia, Javier A.; Gunji, Shuichi; Hayashida, Kiyoshi; Iwakiri, Wataru; Jorstad, Svetlana G.; Karas, Vladimir; Kitaguchi, Takao; Kolodziejczak, Jeffery J.; La Monaca, Fabio; Latronico, Luca; Liodakis, Ioannis; Maldera, Simone; Manfreda, Alberto; Marin, Frederic; Marinucci, Andrea; Marscher, Alan P.; Marshall, Herman L.; Matt, Giorgio; Mitsuishi, Ikuyuki; Mizuno, Tsunefumi; Ng, Stephen C-Y; O'Dell, Stephen L.; Oppedisano, Chiara; Papitto, Alessandro; Pavlov, George G.; Peirson, Abel L.; Perri, Matteo; Pesce-Rollins, Melissa; Pilia, Maura; Poutanen, Juri; Puccetti, Simonetta; Ramsey, Brian D.; Ratheesh, Ajay; Romani, Roger W.; Sgro, Carmelo; Slane, Patrick; Soffitta, Paolo; Spandre, Gloria; Tavecchio, Fabrizio; Tawara, Yuzuru; Tennant, Allyn F.; Thomas, Nicolas E.; Tombesi, Francesco; Trois, Alessio; Tsygankov, Sergey; Vink, Jacco; Wu, Kinwah; Xie, Fei., Magnetars are neutron stars with ultrastrong magnetic fields, which can be observed in x-rays. Polarization measurements could provide information on their magnetic fields and surface properties. We observed polarized x-rays from the magnetar 4U 0142+61 using the Imaging X-ray Polarimetry Explorer and found a linear polarization degree of 13.5 ± 0.8% averaged over the 2– to 8–kilo–electron volt band. The polarization changes with energy: The degree is 15.0 ± 1.0% at 2 to 4 kilo–electron volts, drops below the instrumental sensitivity ~4 to 5 kilo–electron volts, and rises to 35.2 ± 7.1% at 5.5 to 8 kilo–electron volts. The polarization angle also changes by 90° at ~4 to 5 kilo–electron volts. These results are consistent with a model in which thermal radiation from the magnetar surface is reprocessed by scattering off charged particles in the magnetosphere. © 2022 The Authors., R.Ta. and R.Tu. acknowledge financial support from the Italian MUR through grant PRIN 2017LJ39LM. J.H., D.G.-C., I.C., and D.K. acknowledge the support of the Natural Sciences and Engineering Research Council of Canada (NSERC), funding reference number 5007110, and the Canadian Space Agency. D.G.-C. is a Canadian Institute for Theoretical Astrophysical (CITA) National Fellow (grant no. CITA 490888-16). E.G. and H.K. acknowledge NASA support under grants 80NSSC18K0264, 80NSSC22K1291, 80NSSC21K1817, and NNX16AC24G. M.Ne. acknowledges support from NASA under award 80GSFC21M0002. T.T. was supported by grant JSPS KAKENHI JP19H05609. F.Mu., J.R., S.B., E.Co., E.D.M., A.D.M., Y.E., S.F., R.F., F.L.M., G.M., M.Pe., A.R., P.So., and A.T. were supported by ASI and INAF under grants ASI-INAF-2017-12-H0 and ASI-INAF-2022-14-HH.0. L.B., L.L., R.Be., R.Bo., A.B., S.Ca., S.M., A.Mar., C.O., M.P.-R., C.S., and G.S. were supported by ASI and INFN under grants ASI-INFN-2017.13-H0 and ASI-INFN-2021-43-HH.0., With funding from the Spanish government through the Severo Ochoa Centre of Excellence accreditation SEV-2017-0709.

Published
2022

88. Molecular epidemiology of erythropoietic protoporphyria in the U.K.

Author

Whatley SD, Mason NG, Holme SA, Anstey AV, Elder GH, and Badminton MN

Subjects
5-Aminolevulinate Synthetase metabolism, Cross-Sectional Studies, DNA Mutational Analysis methods, Ferrochelatase metabolism, Genetic Predisposition to Disease genetics, Humans, Pedigree, Prevalence, Protoporphyria, Erythropoietic epidemiology, Sequence Analysis, DNA, Statistics as Topic, United Kingdom epidemiology, 5-Aminolevulinate Synthetase genetics, Ferrochelatase genetics, Mutation genetics, Protoporphyria, Erythropoietic genetics
Abstract

Background: Erythropoietic protoporphyria (EPP) is a cutaneous porphyria caused by mutations in the ferrochelatase (FECH) or, less frequently, the delta-aminolaevulinate synthase 2 (ALAS2) gene. Predictive genetic counselling requires accurate molecular diagnosis and knowledge of patterns of inheritance., Objectives: To investigate the molecular epidemiology of EPP in the U.K., Methods: DNA samples from 191 unrelated patients resident in the U.K. were analysed for mutations in the FECH and ALAS2 genes and for the FECH IVS3-48 dimorphism., Results: Mutations were identified in 179 (94%) patients. Most (169; 94%) had a FECH mutation on one allele and were classified as having pseudodominant EPP (psdEPP); seven (4%) patients had FECH mutations on both alleles (autosomal recessive EPP) and three (2%) patients had ALAS2 mutations (X-linked dominant protoporphyria). The FECH IVS3-48C allele was strongly associated with psdEPP and with the absence of mutations at the FECH or ALAS2 loci. Fifty-six FECH mutations were identified, 19 being previously unreported. Missense mutations were predominant in autosomal recessive EPP (82%) but not in psdEPP (32%). One mutation (c.314 + 2T>G) was present in 41 (24%) of EPP families, most of whom appeared to be descended from a common ancestor resident in the north of England., Conclusions: These data define the prevalence and molecular epidemiology of each type of EPP in the U.K.

Published
2010
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89. Diagnostic strategies for autosomal dominant acute porphyrias: retrospective analysis of 467 unrelated patients referred for mutational analysis of the HMBS, CPOX, or PPOX gene.

Author

Whatley SD, Mason NG, Woolf JR, Newcombe RG, Elder GH, and Badminton MN

Subjects
Acute Disease, Adolescent, Adult, Aged, Aged, 80 and over, Base Sequence, Child, DNA Primers, Diagnosis, Differential, Humans, Middle Aged, Porphyrias genetics, Retrospective Studies, Sensitivity and Specificity, Young Adult, Coproporphyrinogen Oxidase genetics, DNA Mutational Analysis, Genes, Dominant, Hydroxymethylbilane Synthase genetics, Mutation, Porphyrias diagnosis, Protoporphyrinogen Oxidase genetics
Abstract

Background: Clinically indistinguishable attacks of acute porphyria occur in acute intermittent porphyria (AIP), hereditary coproporphyria (HCP), and variegate porphyria (VP). There are few evidence-based diagnostic strategies for these disorders., Methods: The diagnostic sensitivity of mutation detection was determined by sequencing and gene-dosage analysis to search for mutations in 467 sequentially referred, unrelated patients. The diagnostic accuracy of plasma fluorescence scanning, fecal porphyrin analysis, and porphobilinogen deaminase (PBGD) assay was assessed in mutation-positive patients (AIP, 260 patients; VP, 152 patients; HCP, 31 patients)., Results: Sensitivities (95% CI) for mutation detection were as follows: AIP, 98.1% (95.6%-99.2%); HCP, 96.9% (84.3%-99.5%); VP, 100% (95.7%-100%). We identified 5 large deletions in the HMBS gene (hydroxymethylbilane synthase) and one in the CPOX gene (coproporphyrinogen oxidase). The plasma fluorescence scan was positive more often in VP (99% of patients) than in AIP (68%) or HCP (29%). The wavelength of the fluorescence emission peak and the fecal coproporphyrin isomer ratio had high diagnostic specificity and sensitivity for differentiating between AIP, HCP, and VP. DNA analysis followed by PBGD assay in mutation-negative patients had greater diagnostic accuracy for AIP than either test alone., Conclusions: When PBG excretion is increased, 2 investigations (plasma fluorescence scanning, the coproporphyrin isomer ratio) are sufficient, with rare exceptions, to identify the type of acute porphyria. When the results of PBG, 5-aminolevulinate, and porphyrin analyses are within reference intervals and clinical suspicion that a past illness was caused by an acute porphyria remains high, mutation analysis of the HMBS gene followed by PBGD assay is an effective strategy for diagnosis or exclusion of AIP.

Published
2009
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90. Gene dosage analysis identifies large deletions of the FECH gene in 10% of families with erythropoietic protoporphyria.

Author

Whatley SD, Mason NG, Holme SA, Anstey AV, Elder GH, and Badminton MN

Subjects
DNA Mutational Analysis, Exons, Family Health, Haplotypes, Humans, Microsatellite Repeats, Mutation, Polymerase Chain Reaction, Protoporphyrins metabolism, Sensitivity and Specificity, Sequence Analysis, DNA, Ferrochelatase genetics, Ferrochelatase physiology, Gene Deletion, Gene Dosage, Protoporphyria, Erythropoietic genetics
Abstract

Erythropoietic protoporphyria (EPP) is an inherited cutaneous porphyria characterized by partial deficiency of ferrochelatase (FECH), accumulation of protoporphyrin IX in erythrocytes, skin, and liver, and acute photosensitivity. Genetic counseling in EPP requires identification of FECH mutations, but current sequencing-based procedures fail to detect mutations in about one in six families. We have used gene dosage analysis by quantitative PCR to identify large deletions of the FECH gene in 19 (58%) of 33 unrelated UK patients with EPP in whom mutations could not be detected by sequencing. Seven deletions were identified, six of which were previously unreported. Breakpoints were identified for six deletions (c.1-7887-IVS1+2425insTTCA; c.1-9629-IVS1+2437; IVS2-1987-IVS4+352del; c.768-IVS7+244del; IVS7+2784-IVS9+108del; IVS6+2350-TGA+95del). Five breakpoints were in intronic repeat sequences (AluSc, AluSq, AluSx, L1MC4). The remaining deletion (Del Ex3-4) is likely to be a large insertion-deletion. Combining quantitative PCR with routine sequencing increased the sensitivity of mutation detection in 189 unrelated UK patients with EPP from 83% (95% CI: 76-87%) to 93% (CI: 88-96%) (P=0.003). Our findings show that large deletions of the FECH gene are an important cause of EPP. Gene dosage analysis should be incorporated into routine procedures for mutation detection in EPP.

Published
2007
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91. Autosomal recessive erythropoietic protoporphyria in the United Kingdom: prevalence and relationship to liver disease.

Author

Whatley SD, Mason NG, Khan M, Zamiri M, Badminton MN, Missaoui WN, Dailey TA, Dailey HA, Douglas WS, Wainwright NJ, and Elder GH

Subjects
Adolescent, Adult, Aged, Alleles, Child, Child, Preschool, Female, Ferrochelatase genetics, Humans, Infant, Liver Diseases genetics, Male, Middle Aged, Prevalence, Protoporphyria, Erythropoietic enzymology, United Kingdom, Genes, Recessive genetics, Liver Diseases epidemiology, Protoporphyria, Erythropoietic epidemiology, Protoporphyria, Erythropoietic genetics
Published
2004
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92. Ferrochelatase gene polymorphism analysis for accurate genetic counselling in erythropoietic protoporphyria.

Author

Morris SD, Mason NG, Elder GH, Hawk JL, and Sarkany RP

Subjects
Adult, Alleles, Humans, Male, Ferrochelatase genetics, Genetic Counseling, Polymorphism, Genetic, Porphyria, Hepatoerythropoietic genetics
Abstract

It has recently been shown that most cases of clinically overt erythropoietic protoporphyria (EPP) result from coinheritance of a mutated ferrochelatase gene and a commonly occurring low-expression normal variant allele. The identification of two polymorphic variant sequences associated with this low-expression allele now enables improved predictive counselling for couples where one partner has EPP. We describe a patient and his spouse in whom we have used such genetic analysis to provide an accurate estimate of the chance that their future offspring may suffer from EPP.

Published
2002
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