On the Kinematic Origin of the Luminosity-Pulse Lag Relationship in Gamma-ray Bursts

Details On the Kinematic Origin of the Luminosity-Pulse Lag Relationship in Gamma-ray Bursts On the Kinematic Origin of the Luminosity-Pulse Lag Relationship in Gamma-ray Bursts

2000-05-12

arxiv.org/abs/astro-ph/0005264v2

Astronomy and Astrophysics

Astrophysics

4 pages, including 1 figure, to appear in ApJ Letters. Final draft incorporating referee's suggestions. Also, section 5 ("Obse

Scientific paper

10.1086/317305

This paper presents an interpretation based on gamma-ray burst source kinematics for the relationship found by Norris et al. between peak luminosity and energy-dependent pulse lag. I argue that the correlation should instead be between "number" luminosity and pulse lag. This interpretation improves the least-squares fit of this correlation for the known bursts by 25 percent or more. It also suggests a distance estimation scheme. I propose that this relationship is due to the variation in line-of-sight velocity among bursts. This interpretation allows one to speculate on the range of gamma-ray burst expansion velocities or the size of their jet opening angles.

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