Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010scchg..53..163l&link_type=abstract
Science China Physics, Mechanics and Astronomy, Volume 53, Issue 1, pp.163-170
Astronomy and Astrophysics
Astronomy
3
Gamma Ray Bursts, Observations, Statistical, Luminosity-Peak Energy Relation
Scientific paper
Using time-resolved spectral data for a sample of 30 pulses in 27 bright GRBs detected with CGRO/BATSE, we investigate the luminosity-peak energy relation ( L- E p relation) in the decay phases of these pulses. A tight L- E p relation is found for most of the pulses, but its power law index is various among pulses, which is normally distributed at 1.84±0.60(1 σ) for the pulses in our sample, roughly consistent with the L- E p relation within a GRB and the isotropic gamma-ray energy- E p relation among GRBs. The large scatter of the power law index cannot be explained with both the statistical or observational effects and it may be an intrinsic feature, indicating that no universal L- E p relation would be expected among GRBs/pulses. This may strongly weaken the cosmological use of this relation.
Liang Enwei
Lu Ruijing
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