Starling, R. L. C. and Wijers, R. A. M. J. and Hughes, M. A. and Tanvir, N. R. and Vreeswijk, P. M. and Rol, E. and Wiersema, K. and Salamanca, I. (2005) Spectroscopy of the optical afterglow of GRB 021004: Origin of the blue-shifted hydrogen lines. Il nuovo cimento C, 28 (4\5). pp. 553-556. ISSN 1826-9885
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Abstract
We present spectra of the afterglow of GRB 021004 taken with WHT ISIS and VLT FORS1 at three epochs spanning 0.49–6.62 days after the burst. Alongside absorption lines from the host galaxy, we identify absorption in HI, SiIV and CIV with blueshifts of up to 2800 km s−1 from the explosion centre which we assume originates close to the progenitor. We investigate the origin of the outflowing material and evaluate various possible progenitor models, in particular a binary progenitor consisting of a Wolf-Rayet star and hydrogen-rich companion.
| Item Type: | Article |
|---|---|
| Additional Information: | Paper presented at the “4th Workshop on Gamma-Ray Burst in the Afterglow Era”, Rome, October 18-22, 2004. |
| Uncontrolled Keywords: | γ-ray sources; γ-ray bursts ; Spectroscopy and spectrophotometry |
| Subjects: | 500 Scienze naturali e Matematica > 520 Astronomia e scienze connesse |
| Depositing User: | Marina Spanti |
| Date Deposited: | 16 Mar 2020 17:11 |
| Last Modified: | 16 Mar 2020 17:11 |
| URI: | http://eprints.bice.rm.cnr.it/id/eprint/15784 |
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