TY - JOUR
T1 - Correlation between collimation-corrected peak luminosity and spectral lag of Gamma-Ray bursts in the source frame
AU - Heon-Young, Chang
PY - 2012/9
Y1 - 2012/9
N2 - 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.
AB - 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.
KW - Data analysis.
KW - Gamma-ray bursts
UR - http://www.scopus.com/inward/record.url?scp=84870270600&partnerID=8YFLogxK
U2 - 10.5140/JASS.2012.29.3.253
DO - 10.5140/JASS.2012.29.3.253
M3 - Article
AN - SCOPUS:84870270600
SN - 2093-5587
VL - 29
SP - 253
EP - 258
JO - Journal of Astronomy and Space Sciences
JF - Journal of Astronomy and Space Sciences
IS - 3
ER -