Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002chee.conf...45d&link_type=abstract
CURRENT HIGH-ENERGY EMISSION AROUND BLACK HOLES . Proceedings of the 2nd KIAS Astrophysics Workshop. Held 3-8 September 2001 in
Astronomy and Astrophysics
Astrophysics
Scientific paper
We have analyzed the ASCA and RXTE data of the X-ray binaries to study the structure of the accretion flow in the vicinity of the compact object. We focused on the black hole binaries, especially the superluminal jet sources, and the unique neutron star binary, the Rapid Burster. We found two distinct states in the disk emission from GRS 1915+105. One state corresponds to the standard α-disk, while the other state has a high disk temperature and an apparent super-Eddington luminosity. We identify this as the so-called slim disk. Quick and repeated transitions between the slim disk and the α-disk may be the origin of the violent time variations and the ejection of jets in GRS 1915+105. Presence of the slim disk was also indicated in GRO J1655-40 and XTE J1550-564 when the source luminosity was high. Based on the similarities of the light curves between GRS 1915+105 and the Rapid Burster, we have studied the ASCA data of the Rapid Burster during the type II burst activities to look for the evidence of the slim disk. We found that the disk parameters were more or less constant through the burst cycle, while the blackbody emission, which originated from the neutron star surface, showed large changes. This result may be explained if the slim disk is developed during the type II bursts. We discuss on various observational indications of the slim disk in bright low-mass X-ray binaries including a black hole or a weakly magnetized neutron star.
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