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The 1996 Soft State Transitions of Cygnus X-1
| Content Provider | Semantic Scholar |
|---|---|
| Author | Zhang, Shuang Nan Cui, Wei Harmon, Bradley Paciesas, William S. Remillard, R. E. Paradijs, J. A. Van |
| Copyright Year | 1997 |
| Abstract | We report continuous monitoring of Cygnus X-1 in the 1.3–200 keV band using All-Sky MonitoryRossi X-Ray Timing Explorer and BATSEyCompton Gamma Ray Observatory for about 200 days from 1996 February 21 to early September. During this period, Cygnus X-1 experienced a hard-to-soft and then a soft-to-hard state transition. The low-energy X-ray (1.3–12 keV) and high-energy X-ray (20–200 keV) fluxes are strongly anticorrelated during this period. During the state transitions, flux variations of about a factor of 5 and 15 were seen in the 1.3–3.0 keV and 100–200 keV bands, respectively, while the average 4.8–12 keV flux remains almost unchanged. The net effect of this pivoting is that the total 1.3–200 keV luminosity remained unchanged to within 115%. The bolometric luminosity in the soft state may be as high as 50%–70% above the hard state luminosity, after color corrections for the luminosity below 1.3 keV. The blackbody component flux and temperature increase in the soft state are probably caused by a combination of the optically thick disk mass accretion rate increase and a decrease of the inner disk radius. Subject headings: accretion, accretion disks— black hole physics — stars: individual (Cygnus X-1)— X-rays: stars |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://arxiv.org/pdf/astro-ph/9701027v1.pdf |
| Alternate Webpage(s) | http://www.physics.purdue.edu/astro/CuiPapers/The%201996%20Soft%20State%20Transition%20of%20Cygnus%20X-1.pdf |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | Bands Black Hole Bone structure of radius CygnusEd Professional Diagnostic radiologic examination Ephrin Type-B Receptor 1, human Fever Kiloelectronvolt Medical Subject Headings Rajiformes Soft state Stars, Celestial State transition X-Ray (Amazon Kindle) |
| Content Type | Text |
| Resource Type | Article |
