Gas and dust properties in the afterglow spectra of GRB 050730

被引：61

作者：

Starling, RLC

Vreeswijk, PM

Ellison, SL

Rol, E

Wiersema, K

Levan, AJ

Tanvir, NR

Wijers, RAMJ

Tadhunter, C

Zaurin, JR

Delgado, RMG

Kouveliotou, C

机构：

[1] Univ Amsterdam, Astron Inst Anton Pannekoek, NL-1098 SJ Amsterdam, Netherlands

[2] European So Observ, Santiago 19, Chile

[3] Univ Victoria, Dept Phys & Astron, Victoria, BC V8P 1A1, Canada

[4] Univ Leicester, Dept Phys & Astron, Leicester LE1 7RH, Leics, England

[5] Univ Hertfordshire, Ctr Astrophys Res, Hatfield AL10 9AB, Herts, England

[6] Univ Sheffield, Dept Phys & Astron, Sheffield S3 7RH, S Yorkshire, England

[7] CSIC, Inst Astrofis Andalucia, E-18080 Granada, Spain

[8] NASA, George C Marshall Space Flight Ctr, NSSTC, Huntsville, AL 35805 USA

来源：

ASTRONOMY & ASTROPHYSICS | 2005年 / 442卷 / 02期

关键词：

gamma rays : bursts; galaxies : distances and redshifts; cosmology : observations;

D O I：

10.1051/0004-6361:200500181

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present early WHT ISIS optical spectroscopy of the afterglow of gamma-ray burst GRB050730. The spectrum shows a DLA system with the highest measured hydrogen column to date: N(H I) = 22.1 +/- 0.1 at the third-highest GRB redshift z = 3.968. Our analysis of the Swift XRT X-ray observations of the early afterglow show X-ray flares accompanied by decreasing X-ray absorption. From both the optical and the X-ray spectra we constrain the dust and gas properties of the host galaxy. We find the host to be a low metallicity galaxy, with low dust content. Much of the X-ray absorbing gas is situated close to the GRB, whilst the H I absorption causing the DLA is most likely located further out.

引用

页码：L21 / U6

页数：6

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