Study of the Cir X--1 Broad Band Spectrum at Orbital Phases Close to the Apoastron

Details Study of the Cir X--1 Broad Band Spectrum at Orbital Phases Close to the Apoastron Study of the Cir X--1 Broad Band Spectrum at Orbital Phases Close to the Apoastron

2001-11-07

arxiv.org/abs/astro-ph/0111153v1

Astronomy and Astrophysics

Astrophysics

15 pages, 6 figures, accepted by ApJ

Scientific paper

10.1086/338507

We report on the results of a BeppoSAX (1.8--200 keV) observation of the peculiar X-ray binary source Circinus X--1 (Cir X--1) at the orbital phases between 0.61 and 0.63. We find that three components are needed to fit the broad band spectrum: a blackbody component, at a temperature of $\sim 0.6$ keV, a Comptonized component, with a seed-photon temperature of $\sim 1.2$ keV, electron temperature of $\sim 6$ keV and optical depth of $\sim 1.7$, and a power-law component dominating the spectrum at energies higher than 20 keV. We interpret the blackbody as the emission from the accretion disk, while the Comptonized component probably comes from a corona surrounding the inner part of the system. This spectrum is different from that observed at the periastron (Iaria et al. 2001a) because of the presence of the blackbody component. We discuss the implications of this difference and the presence of the power-law component.

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