The complex 0.4-12 keV X-ray spectrum of Cygnus X-1

Details The complex 0.4-12 keV X-ray spectrum of Cygnus X-1 The complex 0.4-12 keV X-ray spectrum of Cygnus X-1

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...352l..41b&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 352, April 1, 1990, p. L41-L44.

Astronomy and Astrophysics

Astronomy

20

Astronomical Spectroscopy, Black Holes (Astronomy), Stellar Spectra, X Ray Binaries, X Ray Spectra, Accretion Disks, Continuous Spectra, Exosat Satellite, Spectral Emission, Spectrum Analysis

Scientific paper

Simultaneous observations of the 0.4-2 keV and 2-12 low-state spectrum of Cygnus X-1, made with the low-energy transmission grating spectrometer and gas scintillation proportional counter on board EXOSAT, are presented. At least four spectral components are required to describe the data: a hard (energy spectral index alpha about 0.4) power law dominating the emission above 2 keV, a broad (FWHM 170 eV) emission line near 6.3 keV, a steep (alpha = 2.2) continuum below 3 keV, and a broad emission feature between 600 and 800 eV. Conventional viscous accretion disk models (alpha disks) cannot simultaneously explain both the spectral shape and the luminosity of the steep soft continuum component.

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