Spectroscopy of the host galaxy of the gamma-ray burst 980703

被引：201

作者：

Djorgovski, SG ^{[1
]}

Kulkarni, SR

Bloom, JS

Goodrich, R

Frail, DA

Piro, L

Palazzi, E

机构：

[1] CALTECH, Palomar Observ, Pasadena, CA 91125 USA

[2] WM Keck Observ, Kamuela, HI 96743 USA

[3] Natl Radio Astron Observ, Socorro, NM 87801 USA

[4] CNR, Ist Astrofis Spaziale, I-00133 Rome, Italy

[5] CNR, Ist Tecnol & Studio Radiaz Extraterr, I-40129 Bologna, Italy

来源：

ASTROPHYSICAL JOURNAL | 1998年 / 508卷 / 01期

基金：

美国国家航空航天局; 美国国家科学基金会;

关键词：

cosmology : miscellaneous; cosmology : observations; gamma rays : bursts;

D O I：

10.1086/311729

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present spectroscopic observations of the host galaxy of GRB 980703. Several emission and absorption features are detected, making the redshift (z = 0.966) completely unambiguous. This is only the third known redshift for a gamma-ray burst (GRB) host. The implied isotropic gamma-ray energy release from the burst is in excess of 10(53) ergs for a reasonable choice of cosmological parameters. The spectroscopic properties of the host galaxy are typical for a star formation-powered object. Using the observed value of the Balmer decrement, we derived the extinction in the galaxy's rest frame: A(v) approximate to 0.3 +/- 0.3 mag. Using three different star formation rate (SFR) indicators, we estimate SFR approximate to 10 M-. yr(-1) or higher, depending on the extinction, with a lower limit of SFR > 7 M-. yr(-1). This is the highest value of the SFR measured for a GRB galaxy so far, and it gives some support to the idea that GRBs are closely related to massive star formation.

引用

页码：L17 / L20

页数：4

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