Physics
Scientific paper
Jun 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005chjas...5..273y&link_type=abstract
Chinese Journal of Astronomy & Astrophysics, Vol. 5 Supplement, p. 273-278
Physics
12
Accretion Disks, Black Hole Physics, Radiation Mechanisms: Thermal, X-Rays: Binaries
Scientific paper
We carried out systematic spectral analysis for 10 black hole candidates (BHCs) in the low/hard states, using archival RXTE and Beppo-SAX data which cover a broad energy range of 2-250 keV. For in total 156 observations, the simple analytic model, a power law with an exponentiall cutoff modified with a smeared edge model, were adopted. Consequently, we found that the photon index was distributed over 1.2-1.8 and the cutoff energy was more than 40 keV. We also found that there is the different behaviour between the photon index/cutoff energy and the luminosity at lower and higher luminosities with its value of 2×1037 erg s-1. For example, a clear anti-correlation is found between the cutoff energy and the luminosity when its value is more than 2×1037 erg s-1. In addition, we performed the same analysis for 1 neutron star (NS) and 1 active galactic nuclei (AGN) for comparison. No clear differences between BHCs, NS and AGN were found, which might suggest that the accretion mechanisms in the low/hard states are independent of the mass of the central object.
Arai Mariko
Uzawa Masami
Yamaoka Kazutaka
Yamazaki Tohru
Yoshida Atsumasa
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