Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-06-27
AIP Conf.Proc. 662 (2003) 134-136
Astronomy and Astrophysics
Astrophysics
3 pages including 3 color figures, to appear in "Gamma-Ray Burst and Afterglow Astronomy 2001", Woods Hole; 5-9 Nov, 2001
Scientific paper
10.1063/1.1579319
A strong correlation is reported between gamma-ray burst (GRB) pulse lags and afterglow jet-break times for the set of bursts (seven) with known redshifts, luminosities, pulse lags, and jet-break times. This may be a valuable clue toward understanding the connection between the burst and afterglow phases of these events. The relation is roughly linear (i.e. doubling the pulse lag in turn doubles the jet break time) and thus implies a simple relationship between these quantities. We suggest that this correlation is due to variation among bursts of emitter Doppler factor. Specifically, an increased speed or decreased angle of velocity, with respect to the observed line-of-site, of burst ejecta will result in shorter perceived pulse lags in GRBs as well as quicker evolution of the external shock of the afterglow to the time when the jet becomes obvious, i.e. the jet-break time. Thus this observed variation among GRBs may result from a perspective effect due to different observer angles of a morphologically homogeneous populations of GRBs. Also, a conjecture is made that peak luminosities not only vary inversely with burst timescale, but also are directly proportional to the spectral break energy. If true, this could provide important information for explaining the source of this break.
No associations
LandOfFree
Kinematics of Gamma-Ray Bursts and their Relationship to Afterglows does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Kinematics of Gamma-Ray Bursts and their Relationship to Afterglows, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Kinematics of Gamma-Ray Bursts and their Relationship to Afterglows will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-646769