Compton reflection in Scorpius X-1 and Cygnus X-3?

Astronomy and Astrophysics – Astronomy

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Accretion Disks, Bremsstrahlung, Compton Effect, Reflection, Stellar Spectra, X Ray Binaries, X Ray Spectra, Stellar Radiation, X Ray Astronomy

Scientific paper

The Compton reflection of X-ray photons by an accretion disk has been proposed to play a role in active galactic nuclei and galactic black hole candidates as well as in binary systems that contain a neutron star as a compact accreting object. We present HEXE (20-200 keV) and TTM (2-30 keV) data of the low-mass X-ray binary (LMXB) system Sco X-1 and of Cyg X-3 and discuss the results of Compton reflection fits. We find that a reflected component from an incident bremsstrahlung spectrum can describe the spectra of Sco X-1, while a Compton-reflected component (assuming an incident power-law spectrum) is not required for Cyg X-3.

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