NDLI: The correlations between hardness ratios and fitting parameters in GRB spectrum

Content Provider	Springer Nature Link
Author	Liang, En Wei Xie, Guang Zhong Rong, Xiao Ge
Copyright Year	2002
Abstract	In this paper, besides general definition of hardness ratio of gamma-ray bursts (GRBs), HR 32, we also presented new definitions of hardness ratios, HR hl and HR ll, then presented the results of correlation studies, examining the association between the hardness ratios and the spectral fitting parameters (E 0 or E peak, α, β) by using the GRB data observed by BATSE. The HR hl is defined as the fluence of channel 4 divided by the sum of the fluences of channels 1 to 3,and the HR ll is defined as the fluence of channel 3 divided by the sum of the fluences of channel 1 and 2. We found that E 0 and E peak are correlated with hardness ratios, and β is only correlated with log (HR hl). The α is not correlated with any hardness ratios in the total sample of GRBs, while it correlated with log (HR ll) and log (HR 32) in the two subsets seperated at log (HR ll) = 0.34 ×α +0.66, respectively. These results show that a harder spectra tends to be steeper and has a higher E peak or E 0; HR hl describes the spectral behaviors in high energy, while both of HR ll and HR 32 reflect the spectral characteristics in low energy; the spectral behaviors in low energy are different for the two subsets. We also presented a brief qualitative analysis discussion to the correlations and suggested that the correlations are caused by both of intrinsic and cosmological effects, but intrinsic effects are dominant.
Starting Page	357
Ending Page	368
Page Count	12
File Format	PDF
ISSN	0004640X
Journal	Astrophysics and Space Science
Volume Number	280
Issue Number	4
e-ISSN	1572946X
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2002-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Astronomy
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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