Correlation between collimation-corrected peak luminosity and spectral lag of Gamma-Ray bursts in the source frame

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

We revisit the relation between the peak luminosity Liso and the spectraltime lag in the source frame. Since gamma-ray bursts (GRBs) are generally thought to be beamed, it is natural to expect that the collimation-corrected peak luminosity may well correlate with the spectral time lag in the source frame if the lag-luminosity relation inthe GRB source frame exists. With 12 long GRBs detected by the Swift satellite, whose redshift and spectral lags in the source frame are known, we computed L0, H and L0, W using bulk Lorentz factors Γ0, H and Γ0, W archived inthe published literature, where the subscripts H and W represent homogeneous and wind-like circumburst environments, respectively. We have confirmed that the isotropic peak luminosity correlates with the spectral time lag in the source frame. We have also confirmed that there is an anti-correlation between the source-frame spectral lag and the peak energy, Epeak (1 + z) in the source frame. We have found that the collimation-corrected luminosity correlates in a similar way with the spectral lag, except that the correlations are somewhat less tight. The correlation in the wind density profile seems to agree with the isotropic peak luminosity case better than in the homogeneous case. Finally we conclude by briefly discussing its implications.

Original languageEnglish
Pages (from-to)253-258
Number of pages6
JournalJournal of Astronomy and Space Sciences
Volume29
Issue number3
DOIs
StatePublished - Sep 2012

Keywords

  • Data analysis.
  • Gamma-ray bursts

Fingerprint

Dive into the research topics of 'Correlation between collimation-corrected peak luminosity and spectral lag of Gamma-Ray bursts in the source frame'. Together they form a unique fingerprint.

Cite this