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A two-temperature accretion disk model for Cygnus X-1 - Structure and spectrum
Abstract
A model for Cygnus X-1, involving an accretion disk around a black hole, is presented which can explain the observed X-ray spectrum from 8 to 500 keV. In particular, a detailed model is constructed for the structure of an accretion disk whose inner region is considerably hotter and geometrically thicker than previous disk models. The inner region of the disk is optically thin to absorption, is gas-pressure dominated, and yields, from first principles, electron temperatures of 1 billion K and ion temperatures 3 to 300 times hotter. The spectrum above 8 keV is produced by inverse Compton scattering of soft X-ray photons in the two-temperature inner region of the disk. This spectrum is computed by numerical integration of the Kompane'ets equation, modified to account for escape of photons from a region of finite (order unity) electron-scattering optical depth.
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Cited by
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Yuan, F., & Narayan, R. (2014) · Annual Review of Astronomy and Astrophysics · doi:10.1146/annurev-astro-082812-141003 · Cited by 1,529
Esin, A. A., McClintock, J. E., & Narayan, R. (1997) · The Astrophysical Journal · doi:10.1086/304829 · Cited by 1,313
Simulating galaxy formation with black hole driven thermal and kinetic feedback
Weinberger, R., Springel, V., Hernquist, L., Pillepich, A., Marinacci, F., Pakmor, R., Nelson, D., Genel, S., Vogelsberger, M., Naiman, J., et al. (2017) · Monthly Notices of the Royal Astronomical Society · doi:10.1093/mnras/stw2944 · Cited by 1,258
Foundations of Black Hole Accretion Disk Theory
Abramowicz, M. A., & Fragile, P. C. (2013) · Living Reviews in Relativity · doi:10.12942/lrr-2013-1 · Cited by 668
First M87 Event Horizon Telescope Results. VIII. Magnetic Field Structure near The Event Horizon
The Event Horizon Telescope Collaboration, Akiyama, K., Algaba, J. C., Alberdi, A., Alef, W., Anantua, R., Asada, K., Azulay, R., Baczko, A.-K., Ball, D., et al. (2021) · The Astrophysical Journal Letters · doi:10.3847/2041-8213/abe4de · Cited by 667
Metadata
- Authors
- Shapiro, S. L., Lightman, A. P., & Eardley, D. M.
- Venue
- The Astrophysical Journal
- Publisher
- American Astronomical Society
- Published
- 1976-02
- Volume
- 204
- Pages
- 187
- ISSN
- 0004-637X (ISSN-L)
- 1538-4357
- OpenAlex
- W2171203348
- Cited by
- 883
- References
- 0
- FWCI
- 10.63
- Type
- journal article
- Language
- en
- Open access
- closed
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- Shapiro, S. L., Lightman, A. P., & Eardley, D. M. (1976). A two-temperature accretion disk model for Cygnus X-1 - Structure and spectrum. The Astrophysical Journal. https://doi.org/10.1086/154162
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