Graham 2009 GRB 051022 此暗暴的宿主星系金属丰度很高

主要内容:
一般来说长暴来自金属丰度低的大质量恒星坍缩. 但这个暴的宿主星系的金属丰度很高. 文章提出是不是有可能暗暴的金属丰度都比较高?

(可是星系金属丰度高并不代表爆发伽玛暴的前身星的金属丰度高啊)

精彩摘抄:
氧的丰度

文章信息:

· Find Similar Abstracts (with default settings below)

· arXiv e-print (arXiv:0903.5544)

· References in the Article

·

· Translate This Page

Title:		Unusually High Metallicity Host Of The Dark LGRB 051022
Authors:		Graham, J. F.; Fruchter, A. S.; Kewley, L. J.; Levesque, E. M.; Levan, A. J.; Tanvir, N. R.; Reichart, D. E.; Nysewander, M.
Publication:		eprint arXiv:0903.5544
Publication Date:		03/2009
Origin:		ARXIV
Keywords:		Astrophysics - Cosmology and Extragalactic Astrophysics
Comment:		Conference procedings for The Sixth Huntsville Gamma-Ray Burst Symposium 2008 October 20-23 (3 pages, 2 figures)
Bibliographic Code:		2009arXiv0903.5544G

Abstract

We present spectroscopy of the host of GRB 051022 with GMOS nod and shuffle on Gemini South and NIRSPEC on Keck II. We determine a metallicity for the host of log(O/H)+12 = 8.77 using the R23 method (Kobulnicky & Kewley 2004 scale) making this the highest metallicity long burst host yet observed. The galaxy itself is unusually luminous for a LGRB host with a rest frame B band absolute magnitude -21.5 and has the spectrum of a rapidly star-forming galaxy. Our work raises the question of whether other dark burst hosts will show high metallicities.

---

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