The soft X ray spectrum of Cygnus X-1

Details The soft X ray spectrum of Cygnus X-1 The soft X ray spectrum of Cygnus X-1

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989esasp.296..275b&link_type=abstract

In its The 23rd ESLAB Symposium on Two Topics in X Ray Astronomy. Volume 1: X Ray Binaries p 275-278(SEE N90-25711 19-89)

Astronomy and Astrophysics

Astronomy

2

Black Holes (Astronomy), Cygnus Constellation, Exosat Satellite, X Ray Astronomy, X Ray Binaries, Accretion Disks, Emission Spectra, Proportional Counters, Spectrometers, Spectrum Analysis, Stellar Luminosity, Stellar Models, Stellar Radiation

Scientific paper

Simultaneous observations of the 0.4 to 2 keV and 2 to 12 keV spectrum of Cyg X-1 are presented. They were performed with the low energy transmission grating spectrometer and gas scintillation proportional counter on board the EXOSAT observatory. At least four spectral components are required to describe the data: a hard power law dominating the emission above 2 keV; a broad emission line near 6.3 keV; a steep continuum below 2 keV; and broad emission feature between 600 and 800 eV. Conventional viscous accretion disk models cannot simultaneously explain both the spectral shape and the luminosity of the steep soft continuum component.

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