On the nature of the flares from three candidate tidal disruption events

Details On the nature of the flares from three candidate tidal disruption events On the nature of the flares from three candidate tidal disruption events

2006-12-19

arxiv.org/abs/astro-ph/0612525v1

Astronomy and Astrophysics

Astrophysics

3 pages, Conference proceeding to appear in "The Central Engine of Active Galactic Nuclei", ed. L. C. Ho and J.-M. Wang (San F

Scientific paper

The X-ray flares of NGC 5905, RX J1242.6-1119A, and RX J1624.9+7554 observed by Chandra in 2001 and 2002 have been suggested as the candidate tidal disruption events. The distinct features observed from these events may be used to determine the type of a star tidally disrupted by a massive black hole. We investigate these three events, focusing on the differences for the tidal disruption of a giant star and a main sequence, resulted from their different relation between the mass and the radius. We argue that their X-ray flare properties could be modeled by the partial stripping of the outer layers of a solar type star. The tidal disruption of a giant star is excluded completely. This result may be useful for understanding the growth of a supermassive black hole by capturing stars, versus the growth mode through continuous mass accretion.

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