Related papers: Binary corrected X-ray light curve of Cygnus X-3 :…

The Orbital Ephemeris and X-Ray Light Curve of Cyg X-3

The orbital dynamics of Cyg X-3 are a key to understanding this enigmatic X-ray binary. Recent observations by the RXTE ASM and the OSSE instrument on GRO enable us to extend the baseline of arrival time measurements and test earlier models…

Astrophysics · Physics 2009-10-30 Steven M. Matz

A precise measurement of the orbital period parameters of Cygnus X-3

We present X-ray light curves of Cygnus X-3 as measured by the recently launched AstroSat satellite. The light curve folded over the binary period of 4.8 hours shows a remarkable stability over the past 45 years and we find that we can use…

High Energy Astrophysical Phenomena · Physics 2017-11-28 Yash Bhargava , A. R. Rao , K. P. Singh , Manojendu Choudhury , S. Bhattacharyya , S. Chandra , G. C. Dewangan , K. Mukerjee , G. C. Stewart , D. Bhattacharya , N. P. S. Mithun , S. V. Vadawale

X-Ray Spectral Behavior of the Relativistic Jet Source Cygnus X-3

Cyg X-3 is an unusual X-ray binary which shows remarkable correlative behavior between the hard X-ray, soft X-ray, and the radio. We present an analysis of these long term light curves in the context of spectral changes of the system. This…

Astrophysics · Physics 2007-05-23 M. L. McCollough , C. R. Robinson , S. N. Zhang , B. A. Harmon , W. S. Paciesas , S. Dieters , S. Phengchamnan , R. M. Hjellming , M. Rupen , A. J. Mioduszewski , E. B. Waltman , F. D. Ghigo , G. G. Pooley , R. P. Fender , W. Cui , S. Trushkin

The aperiodic broad-band X-ray variability of Cygnus X-3

We study the soft X-ray variability of Cygnus X-3. By combining data from the All-Sky Monitor and Proportional Counter Array instruments on the RXTE satellite with EXOSAT Medium Energy (ME) detector observations, we are able to analyse the…

High Energy Astrophysical Phenomena · Physics 2009-11-13 Magnus Axelsson , Stefan Larsson , Linnea Hjalmarsdotter

Detection of anti-correlated hard X-ray time lag in Cygnus X-3

The wide-band X-ray spectra of the high mass X-ray binary Cygnus X-3 exhibits a pivoting behavior in the `low' (as well as `hard') state, correlated to the radio emission. The time scale of the soft and hard X-rays' anti-correlation, which…

Astrophysics · Physics 2007-05-23 Manojendu Choudhury , A. R. Rao

Secrets behind the RXTE/ASM light curve of Cyg X-3

In wind-fed X-ray binaries, the radiatively driven wind of the primary star can be suppressed by the EUV irradiation of the compact secondary star, leading to an increased accretion rate. This causes feedback between the released accretion…

High Energy Astrophysical Phenomena · Physics 2023-06-07 Osmi Vilhu , Karri Koljonen , Diana Hannikainen

Disk-Jet Connection in Cygnus X-3

We present the results of a detailed correlation study between the soft X-ray, hard X-ray, and radio emission (obtained from RXTE ASM, BATSE, and GBI observations, respectively) of the bright radio emitting Galactic X-ray binary Cygnus X-3.…

Astrophysics · Physics 2009-11-07 M. Choudhury , A. R. Rao , S. V. Vadawale , C. H. Ishwara-Chandra , A. K. Jain

Probing the hard and intermediate states of X-ray binaries using short time-scale variability

Below an accretion rate of approximately a few per cent of the Eddington accretion rate, X-ray binary systems are not usually found in the soft spectral state. However, at accretion rates a factor of a few lower still, in the hard state,…

High Energy Astrophysical Phenomena · Physics 2016-03-18 Chris J. Skipper , Ian M. McHardy

Modeling of orbital modulation of Cygnus X-3 by particle simulations

The formation of the circumbinary envelope of Cygnus X-3 was studied by particle simulations of the WR (Wolf Rayet) companion wind. Light curves resulting from electron scattering absorption in this envelope were computed and compared with…

Astrophysics · Physics 2007-05-23 Osmi Vilhu , Pasi Hakala , Linnea Hjalmarsdotter , Diana Hannikainen , Ada Paizis , Michael McCollough

X-ray Orbital Modulation of Cygnus X-1

We have analyzed over 2 years of RXTE/ASM data for Cygnus X-1. We have detected the 5.6-day orbital period in Lomb-Scargle periodograms of both light curves and hardness ratios when Cyg X-1 was in the hard state. This detection was made…

Astrophysics · Physics 2007-05-23 Linqing Wen , Wei Cui , Alan M. Levine , Hale V. Bradt

Fast Spectral Variability from Cygnus X-1

We have developed an algorithm that, starting from the observed properties of the X-ray spectrum and fast variability of an X-ray binary allows the production of synthetic data reproducing observables such as power density spectra and time…

High Energy Astrophysical Phenomena · Physics 2015-05-19 Y. X. Wu , T. M. Belloni , L. Stella

Understanding the long-term spectral variability of Cygnus X-1 with BATSE and ASM observations

We present an analysis of all observations of Cygnus X-1 by the BATSE (20-300 keV) and by ASM (1.5-12 keV) until 2002 June, including 1200 days of simultaneous data. We find a number of correlations between fluxes and hardnesses in…

Astrophysics · Physics 2011-09-30 Andrzej A. Zdziarski , Juri Poutanen , William S. Paciesas , Linqing Wen

Long term variability of Cygnus X-1: VI. Energy-resolved X-ray variability 1999-2011

We present the most extensive analysis of Fourier-based X-ray timing properties of the black hole binary Cygnus X-1 to date, based on 12 years of bi-weekly monitoring with RXTE from 1999 to 2011. Our aim is a comprehensive study of timing…

High Energy Astrophysical Phenomena · Physics 2014-05-08 V. Grinberg , K. Pottschmidt , M. Böck , C. Schmid , M. A. Nowak , P. Uttley , J. A. Tomsick , J. Rodriguez , N. Hell , A. Markowitz , A. Bodaghee , M. Cadolle Bel , R. E. Rothschild , J. Wilms

The nature of the hard state of Cygnus X-3

The X-ray binary Cygnus X-3 is a highly variable X-ray source that displays a wide range of observed spectral states. One of the main states is significantly harder than the others, peaking at ~ 20 keV, with only a weak low-energy…

Astrophysics · Physics 2009-11-13 L. Hjalmarsdotter , A. A. Zdziarski , S. Larsson , V. Beckmann , M. McCollough , D. C. Hannikainen , O. Vilhu

Ultrasoft state of microquasar Cygnus X-3: X-ray polarimetry reveals the geometry of astronomical puzzle

Cygnus X-3 is an enigmatic X-ray binary, that is both an exceptional accreting system and a cornerstone for the population synthesis studies. Prominent X-ray and radio properties follow a well-defined pattern, yet the physical reasons for…

High Energy Astrophysical Phenomena · Physics 2024-08-14 Alexandra Veledina , Juri Poutanen , Anastasiia Bocharova , Alessandro Di Marco , Sofia V. Forsblom , Fabio La Monaca , Jakub Podgorny , Sergey S. Tsygankov , Andrzej A. Zdziarski , Varpu Ahlberg , David A. Green , Fabio Muleri , Lauren Rhodes , Stefano Bianchi , Enrico Costa , Michal Dovciak , Vladislav Loktev , Michael McCollough , Paolo Soffitta , Rashid Sunyaev

Cygnus X-3: A variable petaelectronvolt gamma-ray source

We report the discovery of variable $\gamma$-rays up to petaelectronvolt from Cygnus X-3, an iconic X-ray binary. The $\gamma$-ray signal was detected with a statistical significance of approximately 10 $\sigma$ by the Large High Altitude…

High Energy Astrophysical Phenomena · Physics 2026-04-14 The LHAASO Collaboration , Zhen Cao , F. Aharonian , Y. X. Bai , Y. W. Bao , D. Bastieri , X. J. Bi , Y. J. Bi , W. Bian , J. Blunier , A. V. Bukevich , C. M. Cai , Y. Y. Cai , W. Y. Cao , Zhe Cao , J. Chang , J. F. Chang , E. S. Chen , G. H. Chen , H. K. Chen , L. F. Chen , Liang Chen , Long Chen , M. J. Chen , M. L. Chen , Q. H. Chen , S. Chen , S. H. Chen , S. Z. Chen , T. L. Chen , X. B. Chen , X. J. Chen , X. P. Chen , Y. Chen , N. Cheng , Q. Y. Cheng , Y. D. Cheng , M. Y. Cui , S. W. Cui , X. H. Cui , Y. D. Cui , B. Z. Dai , H. L. Dai , Z. G. Dai , Danzengluobu , Y. X. Diao , A. J. Dong , X. Q. Dong , K. K. Duan , J. H. Fan , Y. Z. Fan , J. Fang , J. H. Fang , K. Fang , C. F. Feng , H. Feng , L. Feng , S. H. Feng , X. T. Feng , Y. Feng , Y. L. Feng , S. Gabici , B. Gao , Q. Gao , W. Gao , W. K. Gao , M. M. Ge , T. T. Ge , L. S. Geng , G. Giacinti , G. H. Gong , Q. B. Gou , M. H. Gu , F. L. Guo , J. Guo , K. J. Guo , X. L. Guo , Y. Q. Guo , Y. Y. Guo , R. P. Han , O. A. Hannuksela , M. Hasan , H. H. He , H. N. He , J. Y. He , X. Y. He , Y. He , S. Hernández-Cadena , B. W. Hou , C. Hou , X. Hou , H. B. Hu , S. C. Hu , C. Huang , D. H. Huang , J. J. Huang , X. L. Huang , X. T. Huang , X. Y. Huang , Y. Huang , Y. Y. Huang , A. Inventar , X. L. Ji , H. Y. Jia , K. Jia , H. B. Jiang , K. Jiang , X. W. Jiang , Z. J. Jiang , M. Jin , S. Kaci , M. M. Kang , I. Karpikov , D. Khangulyan , D. Kuleshov , K. Kurinov , Cheng Li , Cong Li , D. Li , F. Li , H. B. Li , H. C. Li , Jian Li , Jie Li , K. Li , L. Li , R. L. Li , S. D. Li , T. Y. Li , W. L. Li , X. R. Li , Xin Li , Y. Li , Zhe Li , Zhuo Li , E. W. Liang , Y. F. Liang , S. J. Lin , B. Liu , C. Liu , D. Liu , D. B. Liu , H. Liu , J. Liu , J. L. Liu , J. R. Liu , M. Y. Liu , R. Y. Liu , S. M. Liu , W. Liu , X. Liu , Y. Liu , Y. Liu , Y. N. Liu , Y. Q. Lou , Q. Luo , Y. Luo , H. K. Lv , B. Q. Ma , L. L. Ma , X. H. Ma , I. O. Maliy , J. R. Mao , Z. Min , W. Mitthumsiri , Y. Mizuno , G. B. Mou , A. Neronov , K. C. Y. Ng , M. Y. Ni , L. Nie , L. J. Ou , Z. W. Ou , P. Pattarakijwanich , Z. Y. Pei , D. Y. Peng , J. C. Qi , M. Y. Qi , J. J. Qin , D. Qu , A. Raza , C. Y. Ren , D. Ruffolo , A. Sáiz , D. Savchenko , D. Semikoz , L. Shao , O. Shchegolev , Y. Z. Shen , X. D. Sheng , Z. D. Shi , F. W. Shu , H. C. Song , Yu. V. Stenkin , V. Stepanov , Y. Su , D. X. Sun , H. Sun , J. X. Sun , Q. N. Sun , X. N. Sun , Z. B. Sun , N. H. Tabasam , J. Takata , P. H. T. Tam , H. B. Tan , Q. W. Tang , R. Tang , Z. B. Tang , W. W. Tian , C. N. Tong , L. H. Wan , C. Wang , D. H. Wang , G. W. Wang , H. G. Wang , J. C. Wang , K. Wang , Kai Wang , Kai Wang , L. P. Wang , L. Y. Wang , L. Y. Wang , R. Wang , W. Wang , X. G. Wang , X. J. Wang , X. Y. Wang , Y. Wang , Y. D. Wang , Z. H. Wang , Z. X. Wang , Zheng Wang , D. M. Wei , J. J. Wei , Y. J. Wei , T. Wen , S. S. Weng , C. Y. Wu , H. R. Wu , Q. W. Wu , S. Wu , X. F. Wu , Y. S. Wu , S. Q. Xi , J. Xia , J. J. Xia , G. M. Xiang , D. X. Xiao , G. Xiao , Y. F. Xiao , Y. L. Xin , H. D. Xing , Y. Xing , D. R. Xiong , B. N. Xu , C. Y. Xu , D. L. Xu , R. F. Xu , R. X. Xu , S. S. Xu , W. L. Xu , L. Xue , D. H. Yan , T. Yan , C. W. Yang , C. Y. Yang , F. F. Yang , L. L. Yang , M. J. Yang , R. Z. Yang , W. X. Yang , Z. H. Yang , Z. G. Yao , X. A. Ye , L. Q. Yin , N. Yin , X. H. You , Z. Y. You , Q. Yuan , H. Yue , H. D. Zeng , T. X. Zeng , W. Zeng , X. T. Zeng , M. Zha , B. B. Zhang , B. T. Zhang , C. Zhang , H. Zhang , H. M. Zhang , H. Y. Zhang , J. L. Zhang , J. Y. Zhang , Li Zhang , P. F. Zhang , R. Zhang , S. R. Zhang , S. S. Zhang , S. Y. Zhang , W. Zhang , W. Y. Zhang , X. Zhang , X. P. Zhang , Yi Zhang , Yong Zhang , Z. P. Zhang , J. Zhao , L. Zhao , L. Z. Zhao , S. P. Zhao , X. H. Zhao , Z. H. Zhao , F. Zheng , T. C. Zheng , B. Zhou , H. Zhou , J. N. Zhou , M. Zhou , P. Zhou , R. Zhou , X. X. Zhou , X. X. Zhou , B. Y. Zhu , C. G. Zhu , F. R. Zhu , H. Zhu , K. J. Zhu , Y. C. Zou , X. Zuo , J. S. Wang

Long Term Variability of Cygnus X-1. IV. Spectral Evolution 1999-2004

(abbreviated abstract) We present the long term spectral evolution of the Galactic black hole candidate Cygnus X-1 in the X-rays and at 15GHz using ~200 pointed observations taken between early 1999 and late 2004 with RXTE and the Ryle…

Astrophysics · Physics 2009-11-11 J. Wilms , M. A. Nowak , K. Pottschmidt , G. G. Pooley , S. Fritz

X-ray timing analysis of Cyg X-3 using AstroSat/LAXPC: Detection of milli-hertz quasi-periodic oscillations during the flaring hard X-ray state

We present here results from the X-ray timing and spectral analysis of the X-ray binary Cyg X-3 using observations from Large Area X-ray Proportional Counter (LAXPC) on-board AstroSat. Consecutive lightcurves observed over a period of one…

High Energy Astrophysical Phenomena · Physics 2017-11-01 Mayukh Pahari , H. M. Antia , J. S. Yadav , Jai Verdhan Chauhan , P. C. Agrawal , Ranjeev Misra , V. R. Chitnis , Dhiraj Dedhia , Tilak Katoch , P. Madhwani , R. K. Manchanda , B. Paul , Parag Shah

The Radio : X-ray Correlation of Cygnus X-3 and other Galactic Microquasars

Cygnus X-3, among the Galactic X-ray binaries, is one of the brightest radio sources. Radio image as well as spectral analysis shows the presence of outflow in the form of jets. The SED in the X-ray band shows a complicated structure and…

Astrophysics · Physics 2007-05-23 M. Choudhury , A. R. Rao

INTEGRAL & RXTE Power Spectra of Cygnus X-1

We evaluate 0.03-20 Hz power spectra of the bright black hole binary Cyg X-1 obtained from non-deconvolved INTEGRAL-ISGRI event data. The ISGRI power spectra are compared to contemporary RXTE-PCA ones in the same hard X-ray energy band of…

Astrophysics · Physics 2009-11-11 K. Pottschmidt , J. Wilms , M. A. Nowak , S. Larsson , A. A. Zdziarski , G. G. Pooley