期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 386, 期 1, 页码 L87-L91出版社
BLACKWELL PUBLISHING
DOI: 10.1111/j.1745-3933.2008.00467.x
关键词
radiation mechanisms : non-thermal; dust; extinction; gamma-rays : bursts
We show that gamma-ray bursts (GRBs) of known redshift and rest-frame optical extinction detected by the Swift satellite fully confirm earlier results concerning the distribution of the optical afterglow luminosity at 12 h after trigger ( rest- frame time). This distribution is bimodal and relatively narrow, especially for the high-luminosity branch. This is intriguing, given that Swift GRBs have, on average, a redshift larger than pre-Swift ones, and is unexpected in the common scenario explaining the GRB afterglow. We investigate if the observed distribution can be the result of selection effects affecting a unimodal parent luminosity distribution, and find that either the distribution is intrinsically bimodal, or most ( 60 per cent) of the bursts are absorbed by a substantial amount of grey dust. In both cases we suggest that most dark bursts should belong to the underluminous optical family.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据