The 2175 Å dust feature in a gamma-ray burst afterglow at redshift 2.45

被引：182

作者：

Kruehler, T. ^{[1
,2
]}

Yoldas, A. Kuepcue ^{[2
]}

Greiner, J. ^{[2
]}

Clemens, C. ^{[2
]}

McBreen, S. ^{[2
]}

Primak, N. ^{[2
]}

Savaglio, S. ^{[2
]}

Yoldas, A. ^{[2
]}

Szokoly, G. P. ^{[2
]}

Klose, S. ^{[3
]}

机构：

[1] Tech Univ Munich, Universe Cluster, D-85748 Garching, Germany

[2] Max Planck Inst Extraterr Phys, D-85748 Garching, Germany

[3] Thuringer Landesstemwarte Tautenburg, D-07778 Tautenburg, Germany

来源：

ASTROPHYSICAL JOURNAL | 2008年 / 685卷 / 01期

关键词：

dust; extinction; gamma rays : bursts; X-rays : individual (GRB 070802);

D O I：

10.1086/590240

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present optical and near-infrared photometry of the afterglow of the long gamma-ray burst (GRB) 070802 at redshift 2.45 obtained with the ESO/MPI 2.2 m telescope equipped with the multichannel imager GROND. Follow-up observations in g'r'i'z' and JHK(S) bands started at similar to 17 minutes and extended up to 28 hr postburst. We find an increase in the brightness of the afterglow at early times, which can be explained by the superposition of reverse and forward shock (FS) emission or the onset of the afterglow FS. In addition, we detect a strong broadband absorption feature in the i' band, which we interpret as extinction from the redshifted 2175 angstrom bump in the GRB host galaxy. This is one of the first and clearest detections of the 2175 angstrom feature at high redshift. It is strong evidence for a carbon-rich environment, indicating that Milky Way-or Large Magellanic Cloud-like dust was already formed in substantial amounts in a galaxy at z = 2.45.

引用

页码：376 / 383

页数：8

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