A flash in the dark: UVES Very Large Telescope high-resolution spectroscopy of gamma-ray burst afterglows

被引:75
作者
Fiore, F
D'Elia, V
Lazzati, D
Perna, R
Sbordone, L
Stratta, G
Meurs, EJA
Ward, P
Antonelli, LA
Chincarini, G
Covino, S
Di Paola, A
Fontana, A
Ghisellini, G
Israel, G
Frontera, F
Marconi, G
Stella, L
Vietri, M
Zerbi, F
机构
[1] Osserv Astron Roma, INAF, I-00044 Frascati, Italy
[2] Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England
[3] Univ Colorado, Dept Astrophys & Planetary Sci, Boulder, CO 80309 USA
[4] Princeton Univ Observ, Princeton, NJ 08544 USA
[5] European So Observ, Santiago 19, Chile
[6] Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy
[7] Dunsink Observ, Dublin 15, Ireland
[8] Univ Milano Bicocca, I-20126 Milan, Italy
[9] Osserv Astron Brera, INAF, I-23807 Merate, LC, Italy
[10] Univ Ferrara, Dipartimento Fis, I-44100 Ferrara, Italy
[11] Scuola Normale Super Pisa, I-56100 Pisa, Italy
关键词
cosmology : observations; galaxies : abundances; galaxies : ISM; gamma rays : bursts;
D O I
10.1086/429385
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present the first high-resolution (R = 20; 000 45; 000, corresponding to 14 km s(-1) at 4200 angstrom to 6.6 km s(-1) at 9000 angstrom) observations of the optical afterglow of gamma-ray bursts. GRB 020813 and GRB 021004 were observed by UVES at the Very Large Telescope 22.19 and 13.52 hr after the trigger, respectively. These spectra show that the interstellar matter of the GRB host galaxies is complex, with many components contributing to each main absorption system, and spans a total velocity range of up to about 3000 km s(-1). Several narrow components are resolved down to a width of a few tens of km s(-1). In the case of GRB 021004 we detected both low- and high-ionization lines. Combined with photoionization results obtained with CLOUDY, the ionization parameters of the various systems are consistent with a remarkably narrow range with no clear trend with system velocity. This can be interpreted as due to density fluctuations on top of a regular R-2 wind density profile.
引用
收藏
页码:853 / 867
页数:15
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