Long-term Accretion Rate Modulation by an External Accretion Disk in Gamma-Ray Bursts

Details Long-term Accretion Rate Modulation by an External Accretion Disk in Gamma-Ray Bursts Long-term Accretion Rate Modulation by an External Accretion Disk in Gamma-Ray Bursts

Feb 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010head...11.1404c&link_type=abstract

American Astronomical Society, HEAD meeting #11, #14.04; Bulletin of the American Astronomical Society, Vol. 41, p.675

Astronomy and Astrophysics

Astronomy

Scientific paper

We examine the very long-term evolution of gamma-ray bursts (GRBs) fed by an accretion disk. Regardless of whether the GRB is due to the merger of two neutron stars or a hypernova explosion, the existence of a transient fall-back disk near the progenitor without an external, confining torque will lead to a power law decay in the rate of accretion onto the central engine. This is unavoidable consequence of the fact that the outer edge of an "external disk" continually moves to larger radii due to angular momentum transport. The mass reservoir at large radii moves outward with time and gives a natural power-law decay to the GRB light curves. The different power-law decay segments seen by XRT would represent different physical states of the accretion disk.

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