Nardini 2008 光学余辉的两类：亮暴和暗暴

主要内容:
暗暴要么是来源于本征的暗，或者路上存在吸收尘埃

精彩摘抄:


文章信息:

· arXiv e-print (arXiv:0801.4759)

·

· Translate This Page

Title:		Optical afterglow luminosities in the Swift epoch: confirming clustering and bimodality
Authors:		Nardini, M.; Ghisellini, G.; Ghirlanda, G.
Publication:		eprint arXiv:0801.4759
Publication Date:		01/2008
Origin:		ARXIV
Keywords:		Astrophysics
Comment:		5 pages 3 figures, submitted to MNRAS Letters
Bibliographic Code:		2008arXiv0801.4759N

Abstract

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 hours 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.

---

Bibtex entry for this abstract Preferred format for this abstract (see Preferences)