The interstellar medium of gamma ray burst host galaxies. I. Echelle spectra of swift GRB Afterglows

被引：70

作者：

Prochaska, J. X. ^{[1
]}

Chen, H. -W.

Bloom, J. S.

Dessauges-Zavadsky, M.

O'Meara, J. M.

Bernstein, R.

Burles, S.

Dupree, A. K.

Falco, E.

Thompson, I. B.

机构：

[1] Univ Calif Santa Cruz, Univ Calif Observ, Lick Observ, Santa Cruz, CA 95064 USA

[2] Univ Chicago, Dept Astron, Chicago, IL 60637 USA

[3] Univ Calif Berkeley, Dept Astron, Berkeley, CA 94720 USA

[4] Observ Geneva, CH-1290 Sauverny, Switzerland

[5] Penn State Worthington Scranton, Dept Phys, Dunmore, PA USA

[6] Univ Michigan, Dept Astron, Ann Arbor, MI 48109 USA

[7] MIT, Kavli Inst Astrophys & Space Res, Cambridge, MA 02139 USA

[8] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

[9] Observ Carnegie Inst Washington, Pasadena, CA 91101 USA

来源：

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES | 2007年 / 168卷 / 02期

关键词：

galaxies : ISM; gamma rays : bursts;

D O I：

10.1086/510239

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present optical echelle spectra of four gamma-ray burst (GRB) afterglows ( GRB 050730, GRB 050820, GRB 051111, and GRB 060418) discovered during the first 1.5 yr of operation of the Swift satellite and localized by either the Swift telescope or follow-up ground-based imaging. We analyze the spectra to derive accurate column density measurements for the transitions arising in the interstellar medium( ISM) of the GRB host galaxies. These measurements can be used to constrain the physical properties of the ISM, including the metallicity, dust-to-gas ratio, ionization state, and chemical abundances of the gas. We also present measurements of the strong Mg II systems in the GRB afterglow spectra. With the publication of this paper, we provide the first data release of echelle afterglow spectra by the GRAASP collaboration to the general community.

引用

页码：231 / 267

页数：37

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