View : 12 Download: 4

On the spectral lags and peak counts of the gamma-ray bursts detected by the RHESSI satellite

Title
On the spectral lags and peak counts of the gamma-ray bursts detected by the RHESSI satellite
Authors
Ripa J.Meszaros A.Veres P.Park I.H.
Ewha Authors
박일흥
Issue Date
2012
Journal Title
Astrophysical Journal
ISSN
0004-637XJCR Link
Citation
vol. 756, no. 1
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
A sample of 427 gamma-ray bursts (GRBs) from a database (2002 February-2008 April) of the RHESSI satellite is analyzed statistically. The spectral lags and peak-count rates, which have been calculated for the first time in this paper, are studied, completing an earlier analysis of durations and hardness ratios. The analysis of the RHESSI database has already inferred the existence of a third group with intermediate duration, apart from the so-called short and long groups. The first aim of this article is to discuss the properties of these intermediate-duration bursts in terms of peak-count rates and spectral lags. The second aim is to discuss the number of GRB groups using another statistical method and by also employing the peak-count rates and spectral lags. The standard parametric (model-based clustering) and non-parametric (K-means clustering) statistical tests together with the Kolmogorov-Smirnov and Anderson-Darling tests are used. Two new results are obtained. (1) The intermediate-duration group has properties similar to those of the group of short bursts. Intermediate and long groups appear to be different. (2) The intermediate-duration GRBs in the RHESSI and Swift databases seem to be represented by different phenomena. © © 2012. The American Astronomical Society. All rights reserved..
DOI
10.1088/0004-637X/756/1/44
Appears in Collections:
자연과학대학 > 물리학전공 > Journal papers
Files in This Item:
On the spectral lags and peak counts of the gamma-ray bursts detected by the RHESSI satellite.pdf(804.51 kB)Download
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE