Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-11-16
Astrophys.J.636:L29-L32,2005
Astronomy and Astrophysics
Astrophysics
Accepted to the Astrophysical Journal Letters
Scientific paper
10.1086/499775
Early-time X-ray observations of GRBs with the Swift satellite have revealed a more complicated phenomenology than was known before. In particular, the presence of flaring activity on a wide range of time scales probably requires late-time energy production within the GRB engine. Since the flaring activity is observed in both long and short GRBs, its origin must be within what is in common for the two likely progenitors of the two classes of bursts: a hyperaccreting accretion disk around a black hole of a few solar masses. Here, we show that some of the observational properties of the flares, such as the duration-time scale correlation, and the duration-peak luminosity anticorrelation displayed by most flares within a given burst, are qualitatively consistent with viscous disk evolution, provided that the disk at large radii either fragments or otherwise suffers large amplitude variability. We discuss the physical conditions in the outer parts of the disk, and conclude that gravitational instability, possibly followed by fragmentation, is the most likely candidate for this variability.
Armitage Philip J.
Perna Rosalba
Zhang Bing
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