Fast Spectral State Changes in GRS 1915+105

Details Fast Spectral State Changes in GRS 1915+105 Fast Spectral State Changes in GRS 1915+105

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998tx19.confe.358r&link_type=abstract

Abstracts of the 19th Texas Symposium on Relativistic Astrophysics and Cosmology, held in Paris, France, Dec. 14-18, 1998. Eds.:

Astronomy and Astrophysics

Astrophysics

Scientific paper

The Galactic superluminal source GRS 1915+105 was observed using the Pointed Proportional Counters (PPC) of the Indian X-ray Astronomy Experiment (IXAE). Several types of bursts were seen in this source. The observations indicate change of canonical spectral states (``low-hard'' and ``high-soft'') occurring in a very fast time scale. Comparing the observed time scales with those predicted for advective accretion disks, we find that the fast state changes can occur for two component accretion flows where the classical thin disk and the advective disk coexist. One type of the X-ray burst is regular in occurrence and persists for a long duration. It is found that this type of burst can be explained by invoking radial shocks near the black hole. The implications of these results for the advective accretion disk theory is explored.

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