Red-Shift Distribution of Gamma-ray Bursts and Their Progenitors

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dc.creatorJeong, Soomin
dc.creatorLee, Chang-Hwan
dc.date2007-10-08
dc.date.accessioned2026-07-07T08:34:42Z
dc.date.available2026-07-07T08:34:42Z
dc.descriptionGamma ray bursts have been divided into two classes, long-soft gamma ray burst and short-hard gamma ray burst according to the bimodal distribution in duration time. Due to the harder spectrum and the lack of afterglows of short-hard bursts in optical and radio observations, different progenitors for short-hard bursts and long-soft bursts have been suggested. Based on the X-ray afterglow observation and the cumulative red-shift distribution of short-hard bursts, Nakar et al. (2006) found that the progenitors of short-hard bursts are consistent with old populations, such as mergers of binary neutron stars. Recently, the existence of two subclasses in long-soft bursts has been suggested after considering multiple characteristics of gamma-ray bursts, including fluences and the duration time. In this work, we extended the analysis of cumulative red-shift distribution to two possible subclasses in L-GRBs. We found that two possible subclass GRBs show different red-shift distributions, especially for red-shifts z > 1. Our results indicate that the accumulative red-shift distribution can be used as a tool to constrain the progenitor characteristics of possible subclasses in L-GRBs.
dc.description4 pages, 6 figures
dc.identifierhttps://arxiv.org/abs/0710.1475
dc.identifierhttp://arxiv.org/abs/0710.1475
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/139528
dc.subjectAstrophysics
dc.titleRed-Shift Distribution of Gamma-ray Bursts and Their Progenitors
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