主要内容:
比一般的QSO的吸收体密度大4倍.
(前面一篇文章也说伽玛暴的比QSO的大).
精彩摘抄:
文章信息:
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- · arXiv e-print (arXiv:0906.3191)
- · References in the Article
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| Title: |
| Non variability of intervening absorbers observed in the UVES spectra of the "naked-eye" GRB080319 |
| Authors: |
| D'Elia, V.; Fiore, F.; Goldoni, P.; D'Odorico, V.; Campana, S.; Covino, S.; D'Avanzo, P.; Meurs, E. J. A.; Norci, L.; Tagliaferri, G. |
| Publication: |
| eprint arXiv:0906.3191 |
| Publication Date: |
| 06/2009 |
| Origin: |
| ARXIV |
| Keywords: |
| Astrophysics - Cosmology and Extragalactic Astrophysics, Astrophysics - High Energy Astrophysical Phenomena |
| Comment: |
| 10 pages, 15 ps figures, submitted to MNRAS |
| Bibliographic Code: |
| 2009arXiv0906.3191D |
Abstract
The aim of this paper is to investigate the properties of the intervening absorbers lying along the line of sight of Gamma-Ray Burst (GRB) 080319B through the analysis of its optical absorption features. To this purpose, we analyze a multi-epoch, high resolution spectroscopic observations (R=40000, corresponding to 7.5 km/s) of the optical afterglow of GRB080319B (z=0.937), taken with UVES at the VLT. Thanks to the rapid response mode (RRM), we observed the afterglow just 8m:30s after the GRB onset when the magnitude was R ~ 12. This allowed us to obtain the best signal-to-noise, high resolution spectrum of a GRB afterglow ever (S/N per resolution element ~ 50). Two further RRM and target of opportunity observations were obtained starting 1.0 and 2.4 hours after the event, respectively. Four MgII absorption systems lying along the line of sight to the afterglow have been detected in the redshift range 0.5 < dz =" 0.9,">
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