Results 21 to 30 of about 52,761 (334)

Fast Transitions of X-Ray Variability in the Neutron Star Low-mass X-Ray Binary Cygnus X-2

The Astrophysical Journal
We present a spectral-timing analysis of two NICER observations of the weakly magnetized neutron star low-mass X-ray binary Cygnus X-2. During these observations, we detect a rapid transition from a narrow 50 Hz horizontal-branch oscillation (HBO) to a ...
Liang Zhang, Mariano Méndez, Hua Feng, Diego Altamirano, Zi-xu Yang, Qing-chang Zhao, Shuang-Nan Zhang, Lian Tao, Yue Huang, Xiang Ma, Shu-mei Jia, Ming-yu Ge, Li-Ming Song, Jin-Lu Qu, Shu Zhang   +14 more
doaj   +3 more sources

Polarization properties of weakly magnetized neutron stars in low-mass X-ray binaries [PDF]

Monthly Notices of the Royal Astronomical Society, 2022
ABSTRACT X-ray polarimetry missions like Imaging X-ray Polarimetry Explorer will be able to measure for the first time the polarization properties of accreting, weakly magnetized neutron stars in low-mass X-ray binaries. In this work, we present simulations of the expected X-ray polarized signal, including the coronal emission for ...
Andrea Gnarini, F. Ursini, G. Matt, S. Bianchi, Fiamma Capitanio, M. Cocchi, R. Farinelli, Wenda Zhang   +7 more
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Discovery of strongly variable X-ray polarization in the neutron star low-mass X-ray binary transient XTE J1701−462 [PDF]

Astronomy & Astrophysics, 2023
After about 16 years since its first outburst, the transient neutron star low-mass X-ray binary XTE J1701$-$462 turned on again in September 2022, allowing for the first study of its X-ray polarimetric characteristics by a dedicated observing program ...
M. Cocchi, A. Gnarini, S. Fabiani, F. Ursini, J. Poutanen, F. Capitanio, A. Bobrikova, R. Farinelli, A. Paizis, L. Sidoli, A. Veledina, S. Bianchi, A. Marco, A. Ingram, J. Kajava, F. Monaca, G. Matt, C. Malacaria, R. Mikuvsincov'a, J. Rankin, S. Zane, I. Agudo, L. A. Antonelli, M. Bachetti, L. Baldini, W. Baumgartner, R. Bellazzini, S. Bongiorno, R. Bonino, A. Brez, N. Bucciantini, S. Castellano, E. Cavazzuti, Chien-Ting J. Chen, S. Ciprini, E. Costa, A. Rosa, Ettore Del Monta, L. D. Gesu, N. D. Lalla, I. Donnarumma, Victor Doroshenko, M. Dovvciak, S. Ehlert, T. Enoto, Y. Evangelista, R. Ferrazzoli, Javier A. García, S. Gunji, K. Hayashida, J. Heyl, W. Iwakiri, S. Jorstad, P. Kaaret, V. Karas, F. Kislat, T. Kitaguchi, J. Kolodziejczak, H. Krawczynski, L. Latronico, I. Liodakis, S. Maldera, A. Manfreda, F. Marin, A. Marinucci, A. Marscher, H. Marshall, F. Massaro, I. Mitsuishi, T. Mizuno, F. Muleri, M. Negro, C. Ng, S. O’Dell, N. Omodei, C. Oppedisano, A. Papitto, G. Pavlov, A. L. Peirson, M. Perri, M. Pesce-Rollins, P. Petrucci, M. Pilia, A. Possenti, S. Puccetti, B. Ramsey, A. Ratheesh, O. Roberts, R. Romani, C. Sgro’, P. Slane, P. Soffitta, G. Spandre, D. Swartz, T. Tamagawa, F. Tavecchio, R. Taverna, Y. Tawara, A. Tennant, N. Thomas, F. Tombesi, A. Trois, S. Tsygankov, R. Turolla, J. Vink, M. Weisskopf, Kinwah Wu, F. Xie   +107 more
semanticscholar   +1 more source

Investigating the Lower Mass Gap with Low-mass X-Ray Binary Population Synthesis [PDF]

Astrophysical Journal, 2022
Mass measurements from low-mass black hole X-ray binaries (LMXBs) and radio pulsars have been used to identify a gap between the most massive neutron stars (NSs) and the least massive black holes (BHs).
Jared C. Siegel, Ilia Kiato, V. Kalogera, C. Berry, T. Maccarone, K. Breivik, J. Andrews, S. Bavera, A. Dotter, T. Fragos, K. Kovlakas, D. Misra, K. A. Rocha, Philipp M. Srivastava, Meng-jun Sun, Zepei Xing, E. Zapartas   +16 more
semanticscholar   +1 more source

Kilohertz QPOs in low-mass X-ray binaries as oscillation modes of tori around neutron stars – I [PDF]

, 2017
Márcio G. B. de Avellar, Oliver Porth, Ziri Younsi, Luciano Rezzolla   +3 more
openalex   +2 more sources

Constraining the properties of dense neutron star cores: The case of the low-mass X-ray binary HETE J1900.1–2455 [PDF]

Monthly notices of the Royal Astronomical Society, 2021
Measuring the time evolution of the effective surface temperature of neutron stars can provide invaluable information on the properties of their dense cores.
N. Degenaar, D. Page, J. Eijnden, M. Beznogov, R. Wijnands, Mark T. Reynolds   +5 more
semanticscholar   +1 more source

Accretion Disk Boundary Layers around Neutron Stars: X‐Ray Production in Low‐Mass X‐Ray Binaries [PDF]

The Astrophysical Journal, 2001
We present solutions for the structure of the boundary layer where the accretion disk meets the neutron star, which is expected to be the dominant source of high-energy radiation in low-mass X-ray binaries which contain weakly magnetized accreting neutron stars.
Robert Popham, R. Sunyaev
openalex   +4 more sources

Spectral Energy Distributions of Southern Binary X-Ray Sources

The Astrophysical Journal Supplement Series, 2023
The rapid variability of X-ray binaries (XRBs) produces a wide range of X-ray states that are linked to activity across the electromagnetic spectrum. It is particularly challenging to study a sample of sources large enough to include all types in their ...
John M. Dickey, S. D. Vrtilek, Michael McCollough, Bram Boroson, John A. Tomsick, Charles Bailyn, Jay M. Blanchard, Charlotte Johnson   +7 more
doaj   +1 more source

An Optically Discovered Outburst from XTE J1859+226

The Astrophysical Journal, 2023
Using the Zwicky Transient Facility, in 2021 February we identified the first known outburst of the black hole X-ray transient XTE J1859+226 since its discovery in 1999. The outburst was visible at X-ray, UV, and optical wavelengths for less than 20 days,
Eric C. Bellm, Yuankun Wang, Jan van Roestel, Rebecca A. Phillipson, Michael W. Coughlin, John A. Tomsick, Steven L. Groom, Brian Healy, Josiah Purdum, Ben Rusholme, Jesper Sollerman, Peter Bealo, Stefano Lora, Eddy Muyllaert, Ivo Peretto, Erik J. Schwendeman   +15 more
doaj   +1 more source

Polarization Properties of the Weakly Magnetized Neutron Star X-Ray Binary GS 1826–238 in the High Soft State

The Astrophysical Journal, 2023
The launch of the Imaging X-ray Polarimetry Explorer (IXPE) on 2021 December 9 has opened a new window in X-ray astronomy. We report here the results of the first IXPE observation of a weakly magnetized neutron star, GS 1826−238, performed on 2022 March ...
Fiamma Capitanio, Sergio Fabiani, Andrea Gnarini, Francesco Ursini, Carlo Ferrigno, Giorgio Matt, Juri Poutanen, Massimo Cocchi, Romana Mikusincova, Ruben Farinelli, Stefano Bianchi, Jari J. E. Kajava, Fabio Muleri, Celia Sanchez-Fernandez, Paolo Soffitta, Kinwah Wu, Iván Agudo, Lucio A. Antonelli, Matteo Bachetti, Luca Baldini, Wayne H. Baumgartner, Ronaldo Bellazzini, Stephen D. Bongiorno, Raffaella Bonino, Alessandro Brez, Niccolò Bucciantini, Simone Castellano, Elisabetta Cavazzuti, Stefano Ciprini, Enrico Costa, Alessandra De Rosa, Ettore Del Monte, Laura Di Gesu, Niccolò Di Lalla, Alessandro Di Marco, Immacolata Donnarumma, Victor Doroshenko, Michal Dovčiak, Steven R. Ehlert, Teruaki Enoto, Yuri Evangelista, Riccardo Ferrazzoli, Javier A. Garcia, Shuichi Gunji, Kiyoshi Hayashida, Jeremy Heyl, Wataru Iwakiri, Svetlana G. Jorstad, Vladimir Karas, Takao Kitaguchi, Jeffery J. Kolodziejczak, Henric Krawczynski, Fabio La Monaca, Luca Latronico, Ioannis Liodakis, Simone Maldera, Alberto Manfreda, Frédéric Marin, Andrea Marinucci, Alan P. Marscher, Herman L. Marshall, Ikuyuki Mitsuishi, Tsunefumi Mizuno, C.-Y. Ng, Stephen L. O’Dell, Nicola Omodei, Chiara Oppedisano, Alessandro Papitto, George G. Pavlov, Abel L. Peirson, Matteo Perri, Melissa Pesce-Rollins, Pierre-Olivier Petrucci, Maura Pilia, Andrea Possenti, Simonetta Puccetti, Brian D. Ramsey, John Rankin, Ajay Ratheesh, Roger W. Romani, Carmelo Sgrò, Patrick Slane, Gloria Spandre, Toru Tamagawa, Fabrizio Tavecchio, Roberto Taverna, Yuzuru Tawara, Allyn F. Tennant, Nicholas E. Thomas, Francesco Tombesi, Alessio Trois, Sergey S. Tsygankov, Roberto Turolla, Jacco Vink, Martin C. Weisskopf, Fei Xie, Silvia Zane   +96 more
doaj   +1 more source