Melandri, A. 2011 暗暴是由于尘埃消光的

主要内容:
对Swift暴的53个暗暴的分析，认为来源是消光。主要依据有：红移分布和一般的暴一致；暴本身的特性也一致。

精彩摘抄:


文章信息:

· Find Similar Abstracts (with default settings below)

· arXiv e-print (arXiv:1112.4480)

· References in the Article

· Also-Read Articles (Reads History)

·

· Translate This Page

Title:		The Dark Bursts population in a complete sample of bright Swift Long Gamma-Ray Bursts
Authors:		Melandri, A.; Sbarufatti, B.; D'Avanzo, P.; Salvaterra, R.; Campana, S.; Covino, S.; Vergani, S. D.; Nava, L.; Ghisellini, G.;Ghirlanda, G.; Fugazza, D.; Mangano, V.; Capalbi, M.; Tagliaferri, G.
Publication:		eprint arXiv:1112.4480
Publication Date:		12/2011
Origin:		ARXIV
Keywords:		Astrophysics - High Energy Astrophysical Phenomena, High Energy Physics - Phenomenology
Comment:		8 pages, 4 figures, 3 tables. Accepted for publication in MNRAS
Bibliographic Code:		2011arXiv1112.4480M

Abstract

We study the properties of the population of optically dark events present in a carefully selected complete sample of bright Swift long gamma-ray bursts. The high level of completeness in redshift of our sample (53 objects out of 58) allow us to establish the existence of a genuine dark population and we are able to estimate the maximum fraction of dark burst events (~30%) expected for the whole class of long gamma-ray burst. The redshift distribution of this population of dark bursts is similar to the one of the whole sample. Interestingly, the rest-frame X-ray luminosity (and the de-absorbed X-ray flux) of the sub-class of dark bursts is slightly higher than the average luminosity of the non-dark events. At the same time the prompt properties do not differ and the optical flux of dark events is at the lower tail of the optical flux distribution, corrected for Galactic absorption. All these properties suggest that dark bursts events generate in much denser environments with respect to normal bright events. We can therefore exclude the high-z and the low-density scenarios and conclude that the major cause of the origin of optically dark events is the dust extinction.

---

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