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Constant cyclotron line energy in Hercules X-1 -- Joint Insight-HXMT and NuSTAR observations
G. C. Xiao,Long Ji,Ruediger Staubert,Ming-Yu Ge,Shuinai Zhang,Shuang-Nan Zhang,Andrea Santangelo,L. Ducci,Jin-Yuan Liao,Cheng-Cheng Guo,Xin Li,Wei Zhang,Jin-Lu Qu,Fangjun Lu,Ti-Pei Li,Ti-Pei Li,Li-Ming Song,Yupeng Xu,Qingcui Bu,C. Cai,X. L. Cao,Zhe Chang,Guo-Ming Chen,Li Chen,Tianran Chen,Y. B. Chen,Y. P. Chen,Yu-Peng Chen,Wei Cui,Wei Cui,Wei-Wei Cui,Jing-Kang Deng,Y. W. Dong,Yuan-Yuan Du,Min-Xue Fu,G. H. Gao,He Gao,M. Gao,Yu-Dong Gu,Ju Guan,Can Güngör,Da-Wei Han,Y. Huang,Jia Huo,Shu-Mei Jia,Luhua Jiang,Weichun Jiang,Jing Jin,L. D. Kong,Bin Li,Cong Li,Gang Li,Mingzhe Li,Wei Li,Xufang Li,Xian Li,Y. G. Li,Z. W. Li,Xiaohua Liang,C. Z. Liu,GuoQing Liu,Hongwei Liu,Xiao-Jing Liu,Y. N. Liu,Bo Lu,Xue-Feng Lu,Qi Luo,T. Luo,Xiang Ma,Bin Meng,Y. Nang,Jundan Nie,Ge Ou,N. Sai,S. X. Song,Luming Sun,Y. Tan,Lian Tao,Youli Tuo,C. Wang,G. F. Wang,Juan Wang,W. S. Wang,Y. S. Wang,X. Y. Wen,Bobing Wu,B. Y. Wu,Mei Wu,Shaolin Xiong,Jinyi Yang,S. Yang,Y. J. Yang,Qian-Qing Yin,Q. Q. Yin,Aimei Zhang,Chuan-Peng Zhang,Fan Zhang,HongMei Zhang,Jia Zhang,Tianmeng Zhang,Wenda Zhang,Wen-Zhao Zhang,Yingkang Zhang,Yi Zhang,Yi Zhang,Zhenyu Zhang,Zhi-Xiang Zhang,HongSheng Zhao,Xuchao Zhao,ShiJie Zheng,Jian-Feng Zhou,Yi-Nan Zhu,Yan Zhu +112 more
TL;DR: In this article, the authors report a new measurement from a campaign between Insight-HXMT and NuSTAR performed in February 2018, which confirms that the previously observed long decay phase has ended, and that the line energy instead keeps constant around 37.5 keV after flux correction.
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Abstract: The long-term evolution of the centroid energy of the CRSF in Her X-1 is still a mystery. We report a new measurement from a campaign between {\sl Insight}-HXMT and {\sl NuSTAR} performed in February 2018. Generally, the two satellites show well consistent results of timing and spectral properties. The joint spectral analysis confirms that the previously observed long decay phase has ended, and that the line energy instead keeps constant around 37.5 keV after flux correction.
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Citations
Background model for the high-energy telescope of Insight-HXMT
Jin-Yuan Liao,Shu Zhang,Yong Chen,Juan Zhang,Jing Jin,Zhi Chang,Yu-Peng Chen,Ming-Yu Ge,Cheng-Cheng Guo,Gang Li,Xiaobo Li,Fangjun Lu,Xue-Feng Lu,Jianyin Nie,Li-Ming Song,Yanji Yang,Yuan You,Hai-Sheng Zhao,Shuang-Nan Zhang +18 more
TL;DR: In this paper, a background model for the Hard X-ray Modulation Telescope (dubbed as Insight-HXMT) based on the two-year blank sky observations of the HXMT/HE is presented.
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•Posted Content
Background Model for the High-Energy Telescope of Insight-HXMT
Jin-Yuan Liao,Shu Zhang,Xue-Feng Lu,Juan Zhang,Gang Li,Zhi Chang,Yu-Peng Chen,Ming-Yu Ge,Cheng-Cheng Guo,Rui Huang,Jing Jin,Xiaobo Li,Xufang Li,Zheng-Wei Li,C. X. Liu,Fangjun Lu,Jianyin Nie,Li-Ming Song,Si-Fan Wang,Yuan You,Yifei Zhang,Hai-Sheng Zhao,Shuang-Nan Zhang +22 more
TL;DR: In this article, a background model for the Hard X-ray Modulation Telescope (dubbed as Insight-HXMT) based on the two-year blank sky observations of the HXMT/HE is presented.
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In-flight calibration of the Insight-Hard X-ray Modulation Telescope
Xiaobo Li,Xufang Li,Ying Tan,Yanji Yang,Ming-Yu Ge,Juan Zhang,Youli Tuo,B. B. Wu,Jin-Yuan Liao,Yifei Zhang,Li-Ming Song,Shu Zhang,Jin-Lu Qu,Shuang-Nan Zhang,Fangjun Lu,Yupeng Xu,C. X. Liu,X. L. Cao,Yong Chen,Jianyin Nie,Hai-Sheng Zhao,Cheng-Kui Li +21 more
TL;DR: In this article, the authors present the calibration of the Insight-Hard X-ray Modulation Telescope (Insight-HXMT) Xray satellite, which can be used to perform timing and spectral studies of bright Xray sources.
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The cyclotron line energy in Her X-1: stable after the decay
Rüdiger Staubert,Lorenzo Ducci,Long Ji,F. Fuerst,J. Wilms,R. E. Rothschild,Katja Pottschmidt,McKinley C. Brumback,Fiona A. Harrison +8 more
TL;DR: In this paper, the authors summarize the results of a dedicated effort between 2012 and 2019 to follow the evolution of the cyclotron line in Her~X-1 through repeated NuSTAR observations.
•Posted Content
Spectral evolution of X-ray pulsar 4U 1901+03 during the 2019 outburst based on Insight-HXMT and NuSTAR observations
Armin Nabizadeh,Sergey S. Tsygankov,Sergey S. Tsygankov,Long Ji,Victor Doroshenko,Victor Doroshenko,Sergey V. Molkov,Youli Tuo,Shuang-Nan Zhang,F. J. Lu,Shu Zhang,Juri Poutanen,Juri Poutanen,Juri Poutanen +13 more
TL;DR: In this paper, a detailed spectral analysis of emission from X-ray pulsar 4U 1901+03 using data obtained by the Insight-HXMT and NuSTAR observatories during the 2019 outburst of the source is presented.
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References
THE NUCLEAR SPECTROSCOPIC TELESCOPE ARRAY (NuSTAR) HIGH-ENERGY X-RAY MISSION
Fiona A. Harrison,William W. Craig,William W. Craig,Finn Erland Christensen,Charles J. Hailey,William W. Zhang,Steven E. Boggs,Daniel Stern,W. Rick Cook,Karl Forster,Paolo Giommi,Brian W. Grefenstette,Yunjin Kim,Takao Kitaguchi,Jason E. Koglin,Kristin K. Madsen,Peter H. Mao,Hiromasa Miyasaka,Kaya Mori,M. Perri,Michael J. Pivovaroff,Simonetta Puccetti,Vikram Rana,Niels Jørgen Stenfeldt Westergaard,J. L. Willis,Andreas Zoglauer,Hongjun An,Matteo Bachetti,Matteo Bachetti,Nicolas M. Barrière,Eric C. Bellm,Varun Bhalerao,Varun Bhalerao,Nicolai Brejnholt,Felix Fuerst,Carl Christian Liebe,Craig B. Markwardt,Melania Nynka,Julia Vogel,Dominic J. Walton,Daniel R. Wik,David M. Alexander,L. R. Cominsky,Ann Hornschemeier,Allan Hornstrup,Victoria M. Kaspi,Greg Madejski,Giorgio Matt,S. Molendi,David M. Smith,John A. Tomsick,Marco Ajello,David R. Ballantyne,Mislav Baloković,Didier Barret,Didier Barret,Franz E. Bauer,Roger Blandford,W. Niel Brandt,Laura Brenneman,James Chiang,Deepto Chakrabarty,Jérôme Chenevez,Andrea Comastri,Francois Dufour,Martin Elvis,Andrew C. Fabian,Duncan Farrah,Chris L. Fryer,Eric V. Gotthelf,Jonathan E. Grindlay,D. J. Helfand,Roman Krivonos,David L. Meier,Jon M. Miller,Lorenzo Natalucci,Patrick Ogle,Eran O. Ofek,Andrew Ptak,Stephen P. Reynolds,Jane R. Rigby,Gianpiero Tagliaferri,Stephen E. Thorsett,Ezequiel Treister,C. Megan Urry +84 more
TL;DR: The Nuclear Spectroscopic Telescope Array (NuSTAR) as discussed by the authors is the first focusing high-energy X-ray telescope in orbit, which operates in the band from 3 to 79 keV.
TEMPO2, a new pulsar-timing package - I. An overview
TL;DR: TEMPO2 as discussed by the authors is a new pulsar-timing package that contains propagation and other relevant effects implemented at the 1-ns level of precision (a factor of ∼100 more precise than previously obtainable).
Evidence for strong cyclotron line emission in the hard X-ray spectrum of Hercules X-1
Joachim E. Truemper,Wolfgang Pietsch,Claus Reppin,Wolfgang Voges,Rüdiger Staubert,Eckhard Kendziorra +5 more
TL;DR: In this article, the authors present further results of the Hercules X-1 balloon observation on 1976 May 3 which confirm the existence of a strong line feature at approx.58 keV in the pulsed (1.24s) X-ray spectrum.
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Discovery of a periodic pulsating binary X-ray source in Hercules from Uhuru.
TL;DR: In this article, a new pulsating X-ray source with a 1.24-sec period in the constellation Hercules was discovered, which was interpreted as due to an occulting binary system, with the intensity changes due to occultation of the Xray source by its companion.
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Discovery of a flux-related change of the cyclotron line energy in Her X-1
Rüdiger Staubert,N. I. Shakura,Konstantin Postnov,J. Wilms,R. E. Rothschild,W. Coburn,L. Rodina,D. Klochkov +7 more
TL;DR: In this paper, the authors present the results of ten years of repeated measurements of the Cyclotron Resonance Scattering Feature (CRSF) in the spectrum of the binary X-ray pulsar Her X-1 and report the discovery of a positive correlation of the centroid energy of this absorption feature in pulse phase averaged spectra with source luminosity.
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