Shallow Decay of Early X-ray Afterglows from Inhomogeneous Gamma-Ray Burst Jets

Details Shallow Decay of Early X-ray Afterglows from Inhomogeneous Gamma-Ray Burst Jets Shallow Decay of Early X-ray Afterglows from Inhomogeneous Gamma-Ray Burst Jets

2005-11-25

arxiv.org/abs/astro-ph/0511718v2

Astrophys.J.640:L139-L142,2006

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures, accepted for publication in ApJL

Scientific paper

10.1086/503384

Almost all the X-ray afterglows of gamma-ray bursts (GRBs) observed by the Swift satellite have a shallow decay phase in the first thousands of seconds. We show that in an inhomogeneous jet (multiple-subjet or patchy-shell) model the superposition of the afterglows of off-axis subjets (patchy shells) can have the shallow decay phase. The necessary condition for obtaining the shallow decay phase is that gamma-ray bright subjets (patchy shells) should have gamma-ray efficiency higher than previously estimated, and should be surrounded by gamma-ray dim subjets (patchy shells) with low gamma-ray efficiency. Our model predicts that events with dim prompt emission have the conventional afterglow light curve without the shallow decay phase like GRB 050416A.

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