ideal system for studying jets of material from the accretion disk around a black hole. The remnant accretion disk from a black hole-neutron star binary merger can. Cygnus X-1 unpredictably changes between two X-ray states, although the X-rays may vary continuously between those states as well. These accretion disks are known sources of both soft and hard X-ray emission and, in some cases, are also sources of soft gamma-ray emission. Composition, Collimation, Contamination: The Jet of Cygnus X-1. Cygnus X-1 has also never displayed X-ray bursts similar to those seen from neutron stars. This suggests that the 5-50 keV continuum is not well fit by the same spectrum form applicable at high energies and that a multiple temperature thermal Compton model is necessary to fit the broadband data. For example, the X-ray binary V 0332+53 was thought to be a possible black hole until pulsations were found. The best-fit temperature for a Suniaev-Titarchuk Comptonization model is found to be significantly larger than that found in previous analyses based primarily on data in the 30-140 keV band. Cygnus X-1 (3U 1956+35) is a powerful, variable X-ray source, lying about 8,000 light-years away in the constellation Cygnus that, is one of the best known and nearest stellar black hole candidates it was discovered in 1964. An X-ray reverberation mass measurement of Cygnus X-1. Despite the basic similarity of the observed spectra, there is clear spectral variability between epochs. Even with the energy resolution of the Exosat GSPC, it is found that the derived iron line energy and shape are very dependent on the continuum model used. We employ the accretion disk geometry proposed by Taylor & Reynolds (2018) and we construct. The Soft State of Cygnus X-1 Observed with NuSTAR: A Variable Corona and a Stable Inner Disk We present a multi-epoch hard X-ray analysis of Cygnus X-1 in its soft state based on four observations with the Nuclear Spectroscopic Telescope Array (NuSTAR). binaries such as Cygnus X-1 Fabian 1989, Miller 2002, GX 339-4 Miller 2004b, or. According to the US Naval Observatory, the max flux of Cygnus X-1 (near the. It is shown, on the basis of a likelihood ratio test, that the data are significantly better fit by a Compton reflection model than by a partial covering model. neutron stars present in such systems allows the accretion disk to. Cygnus X-1 is famous as one of the most powerful X-ray sources in the sky.
It is found, in agreement with Ebisawa (1991), that the X-ray spectrum of Cyg X-1 exhibits a 'high-energy excess' above 8 keV, similar to that seen in Ginga spectra of AGN. An ionized accretion disk in cygnus x-1 Results of an analysis of archival Exosat and HEAO 1-A2 observations of Cyg X-1 are presented.
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