Results 1 to 10 of about 9,734,716 (302)

Absorption of Gamma-Ray Burst X-Ray Afterglows by the Missing Baryons: Confronting Observations with Cosmological Simulations

The Astrophysical Journal, 2023
A large fraction of the baryons at low redshift are undetected and likely reside in the tenuous, hot intergalactic medium (IGM). One way to probe the missing baryons is through their absorption of bright sources.
Matan Grauer, Ehud Behar
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Transient X-Ray Sources in the Magellanic-type Galaxy NGC 4449 [PDF]

The Astrophysical Journal, 2017
Abstract We report the identification of seven transient X-ray sources in the nearby Magellanic-type galaxy NGC 4449 using archival multi-epoch X-ray observations conducted with the Chandra, XMM-Newton, and Swift telescopes over the years 2001–2013. Among them, two sources are classified as supersoft X-ray sources (SSSs) because of their
V. Jithesh, Zhongxiang Wang
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The Radio Counterpart to the Fast X-Ray Transient EP240414a

The Astrophysical Journal
Despite being operational for only a short time, the Einstein Probe mission, with its large field of view and rapid localization capabilities, has already significantly advanced the study of rapid variability in the soft X-ray sky.
Joe S. Bright, Francesco Carotenuto, Rob Fender, Carmen Choza, Andrew Mummery, Peter G. Jonker, Stephen J. Smartt, David R. DeBoer, Wael Farah, James Matthews, Alexander W. Pollak, Lauren Rhodes, Andrew Siemion   +12 more
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The Formation Rate and Luminosity Function of Fast X-Ray Transients from Einstein Probe

The Astrophysical Journal Letters
Following its launch on 2024 January 9, the Einstein Probe (EP) telescope has detected hundreds of fast X-ray transients (FXTs), yet their physical origins remain elusive.
Yizhou Guo, Houdun Zeng, Junjie Wei, Hao Zhou, Zhiping Jin, Xuefeng Wu, Daming Wei   +6 more
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The Redshift Distribution of Einstein Probe Transients Supports Their Relation to Gamma-Ray Bursts

The Astrophysical Journal Letters
The launch of the Einstein Probe unleashed a new era of high-energy transient discovery in the largely unexplored soft X-ray band. The Einstein Probe has detected a significant number of fast X-ray transients that display no gamma-ray emission ...
Brendan O’Connor, Paz Beniamini, Eleonora Troja, Malte Busmann, Simone Dichiara, Ramandeep Gill, Jonathan Granot, Michael J. Moss, Xander J. Hall, Antonella Palmese, Niccolò Passaleva, Yu-Han Yang   +11 more
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Triggering the Untriggered: The First Einstein Probe-detected Gamma-Ray Burst 240219A and Its Implications

The Astrophysical Journal Letters
The Einstein Probe (EP) achieved its first detection and localization of a bright X-ray flare, EP240219a, on 2024 February 19, during its commissioning phase.
Yi-Han Iris Yin, Bin-Bin Zhang, Jun Yang, Hui Sun, Chen Zhang, Yi-Xuan Shao, You-Dong Hu, Zi-Pei Zhu, Dong Xu, Li An, He Gao, Xue-Feng Wu, Bing Zhang, Alberto Javier Castro-Tirado, Shashi B. Pandey, Arne Rau, Weihua Lei, Wei Xie, Giancarlo Ghirlanda, Luigi Piro, Paul O’Brien, Eleonora Troja, Peter Jonker, Yun-Wei Yu, Jie An, Run-Chao Chen, Yi-Jing Chen, Xiao-Fei Dong, Rob Eyles-Ferris, Zhou Fan, Shao-Yu Fu, Johan P. U. Fynbo, Xing Gao, Yong-Feng Huang, Shuai-Qing Jiang, Ya-Hui Jiang, Yashaswi Julakanti, Erik Kuulkers, Qing-Hui Lao, Dongyue Li, Zhi-Xing Ling, Xing Liu, Yuan Liu, Jia-Yu Mou, Xin Pan, Varun, Daming Wei, Qinyu Wu, Muskan Yadav, Yu-Han Yang, Weimin Yuan, Shuang-Nan Zhang   +51 more
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Spectral Hardening Reveals Afterglow Emergence in Long-duration Fast X-Ray Transients: A Case Study of GRB 250404A/EP250404a

The Astrophysical Journal Letters
The prompt emission and afterglow phases of gamma-ray bursts (GRBs) have been extensively studied, yet the transition between these two phases remains inadequately characterized due to limited multiwavelength observational coverage.
Yi-Han Iris Yin, Yuan Fang, Bin-Bin Zhang, Chen Deng, Jun Yang, Run-Chao Chen, Yuan Liu, Yehao Cheng, Dong Xu, Xiaofeng Wang, Rongfeng Shen, Rui-Zhi Li, Jirong Mao, Wen-Xiong Li, Alberto Javier Castro-Tirado, Weihua Lei, Shao-Yu Fu, Yuan-Pei Yang, Shuai-Qing Jiang, Jie An, Chun Chen, Zhong-Nan Dong, Guowang Du, Ali Esamdin, Zhou Fan, Haicheng Feng, Lu Feng, Emilio Fernández-García, Xing Gao, Maria Gritsevich, Wei-Jian Guo, Jingwei Hu, You-Dong Hu, Yanlong Hua, Abdusamatjan Iskandar, Junjie Jin, Niu Li, Xia Li, Ziwei Li, Jia-Qi Lin, Dezi Liu, Jinzhong Liu, Qichun Liu, Xiaowei Liu, Xing Liu, Daniele B. Malesani, Ignacio Pérez-García, Hui Sun, Xue-Feng Wu, Yun-Ao Xiao, Ding-Rong Xiong, Shengyu Yan, Beibei Zhang, Jinghua Zhang, Haichang Zhu, Zipei Zhu, Hu Zou, Weimin Yuan, Bing Zhang   +58 more
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Eight Years of Light from ASASSN-15oi: Toward Understanding the Late-time Evolution of TDEs

The Astrophysical Journal
We present results from an extensive follow-up campaign of the tidal disruption event (TDE) ASASSN-15oi spanning δt  ∼ 10–3000 days, offering an unprecedented window into the multiwavelength properties of a TDE during its first ≈8 yr of evolution. ASASSN-
A. Hajela, K. D. Alexander, R. Margutti, R. Chornock, M. Bietenholz, C. T. Christy, M. Stroh, G. Terreran, R. Saxton, S. Komossa, J. S. Bright, E. Ramirez-Ruiz, D. L. Coppejans, J. K. Leung, Y. Cendes, E. Wiston, T. Laskar, A. Horesh, G. Schroeder, Nayana A. J., M. H. Wieringa, N. Velez, E. Berger, P. K. Blanchard, T. Eftekhari, S. Gomez, M. Nicholl, H. Sears, B. A. Zauderer   +28 more
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Dinosaur in a Haystack: X-Ray View of the Entrails of SN 2023ixf and the Radio Afterglow of Its Interaction with the Medium Spawned by the Progenitor Star (Paper I)

The Astrophysical Journal
We present the results from our extensive hard-to-soft X-ray (NuSTAR, Swift-XRT, XMM-Newton, Chandra) and meter-to-millimeter-wave radio (Giant Metrewave Radio Telescope, Very Large Array, NOEMA) monitoring campaign of the very nearby ( d  = 6.9 Mpc ...
Nayana A. J., Raffaella Margutti, Eli Wiston, Ryan Chornock, Sergio Campana, Tanmoy Laskar, Kohta Murase, Melanie Krips, Giulia Migliori, Daichi Tsuna, Kate D. Alexander, Poonam Chandra, Michael Bietenholz, Edo Berger, Roger A. Chevalier, Fabio De Colle, Luc Dessart, Rebecca Diesing, Brian W. Grefenstette, Wynn V. Jacobson-Galán, Keiichi Maeda, Benito Marcote, Daisy Matthews, Dan Milisavljevic, Alak K. Ray, Andrea Reguitti, Ava Polzin   +26 more
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Supergiant Fast X-ray Transients as transient sources in High Mass X-ray Binaries

, 2011
Supergiant Fast X-ray Transients (SFXTs) represent the most extreme case of X-ray variability in High Mass X-ray Binaries hosting blue supergiant companions. Mainly discovered thanks to the INTEGRAL monitoring of the Galactic plane, these hard X-ray transients display dynamic ranges which can span five orders of magnitude. This intensity variability is
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