Astronomy and Astrophysics – Astronomy
Scientific paper
May 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21642814s&link_type=abstract
American Astronomical Society, AAS Meeting #216, #428.14
Astronomy and Astrophysics
Astronomy
Scientific paper
We present spectral analysis of data collected using RXTE during two periods of X-ray activity in 1998 and 2000 from the Galactic X-ray black hole binary XTE J1550-564.
We particularly concentrate on the behavior of the high energy cutoff (folding energy) of the power law part of the spectrum. The 1998 event was very powerful, showing a quick initial transition from low-hard state to very high state. The power law cutoff energy decreased from low-hard to intermediate states and increased again during transition to very high and high-soft states. For the 2000 outburst we also observe the decrease of the cutoff energy during the start of the state transition, similar to that in 1998 outburst, however the increase of the high energy cutoff is not apparent in this track because the source does not reach the real high-soft state in this event. We attribute this difference in the cutoff energy behavior to the different partial contributions of the thermal and non-thermal (bulk motion) Comptonization in photon upscattering. Namely, during the 1998 event higher accretion rate presumably provided more cooling to the Comptonizing media and thus reducing the effectiveness of the thermal upscattering process. Under these conditions the bulk motion should take a leading role in boosting the input soft photons. This observational behavior of the cutoff energy presents an additional evidence of the existence of the converging bulk motion region near the central objects and provides further support for the previously reported index saturations effect as a black hole signature.
Shaposhnikov Nikolai
Titarchuk Lev
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