Aoki 2008 GRB 060206没有变化的中间路上吸收线

主要内容:


精彩摘抄:


文章信息:

· Find Similar Abstracts (with default settings below)

· arXiv e-print (arXiv:0808.4157)

· References in the Article

·

· Translate This Page

Title:		No Evidence for Variability of Intervening Absorption Lines toward GRB 060206: Implications for the Mg II Incidence Problem
Authors:		Aoki, Kentaro; Totani, Tomonori; Hattori, Takashi; Ohta, Kouji; Kawabata, Koji S.; Kobayashi, Naoto; Iye, Masanori; Nomoto, Ken-ichi; Kawai, Nobuyuki
Publication:		eprint arXiv:0808.4157
Publication Date:		08/2008
Origin:		ARXIV
Keywords:		Astrophysics
Comment:		Submitted tp PASJ
Bibliographic Code:		2008arXiv0808.4157A

Abstract

We examine variability of absorption line strength of intervening systems along the line of sight to GRB 060206 at z=4.05, by the low-resolution optical spectra obtained by the Subaru telescope from six to ten hours after the burst. Although strong variabilities of Fe II and Mg II lines at z=1.48 during t=5-8 hours have been reported for this GRB (Hao et al. 2007), our spectra with higher signal-to-noise ratio do not show any evidence for variability in t=6-10 hours. There is a clear discrepancy between our data and Hao et al. data in the overlapping time interval. Furthermore, the line strengths in our data are in good agreement with those observed at t~2 hours by Thone et al.(2008). We also detected Fe II and Mg II absorption lines for a system at z=2.26, and these lines do not show evidence for variability either. Therefore we conclude that there is no evidence for variability of intervening absorption lines toward GRB 060206. The intervening line variability has been used to support the idea of clumpy Mg II cloudlets that was originally proposed to explain the anomalously high incidence of Mg II absorbers in GRB spectra compared with quasars, but this Mg II incidence anomaly should be explained by other effects.

---

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