Ukwatta, T. N. 2009 光变的谱时延和光度的关系

主要内容:
有关系, 光度越大, 时延越小. 指数关系是1.4

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Title:		Spectral Lags and the Lag-Luminosity Relation: An Investigation with Swift BAT Gamma-ray Bursts
Authors:		Ukwatta, T. N.; Stamatikos, M.; Dhuga, K. S.; Sakamoto, T.; Barthelmy, S. D.; Gehrels, N.; Norris, J. P.; Parke, W. C.
Publication:		eprint arXiv:0908.2370
Publication Date:		08/2009
Origin:		ARXIV
Keywords:		Astrophysics - High Energy Astrophysical Phenomena
Comment:		18 Pages, 11 Figures and 5 Tables; Submitted to The Astrophysical Journal
Bibliographic Code:		2009arXiv0908.2370U

Abstract

Spectral lag, the time difference between the arrival of high-energy and low-energy photons, is a common feature in Gamma-ray Bursts (GRBs). Norris et al. 2000 reported a correlation between the spectral lag and the isotropic peak luminosity of GRBs based on a limited sample. More recently, a number of authors have provided further support for this correlation using arbitrary energy bands of various instruments. In this paper we report on a systematic extraction of spectral lags based on the largest Swift sample to date of 31 GRBs with measured redshifts. We extracted the spectral lags for all combinations of the standard Swift hard x-ray energy bands: 15-25 keV, 25-50 keV, 50-100 keV and 100-200 keV and plotted the time dilation corrected lag as a function of isotropic peak luminosity. The mean value of the correlation coefficient for various channel combinations is -0.67 with a chance probability of ~ 1.0 x 10^{-3}. In addition, the mean value of the power-law index is 1.4 +/- 0.3. Hence, our study lends support for the existence of a lag-luminosity correlation, albeit with large scatter.

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