Probing the complex environments of GRB host galaxies and intervening systems: high resolution spectroscopy of GRB050922C
- Piranomonte, S.
- Ward, P. A.
- Fiore, F.
- Vergani, S. D.
- D'Elia, V.
- Krongold, Y.
- Nicastro, F.
- Meurs, E. J. A.
- Chincarini, G.
- Covino, S.
- Della Valle, M.
- Fugazza, D.
- Norci, L.
- Sbordone, L.
- Stella, L.
- Tagliaferri, G.
- Burrows, D. N.
- Gehrels, N.
- Goldoni, P.
- Malesani, D.
- Mirabel Miquele, Igor Felix
- Pellizza González, Leonardo Javier
- Perna, R.
DOIAbstract
Aims. The aim of this paper is to investigate the environment of gamma ray bursts (GRBs) and the interstellar matter of their host galaxies. Methods. To this purpose we use high resolution spectroscopic observations of the afterglow of RB050922C, obtained with UVES/VLT ∼ 3.5 h after the GRB event. Results. We found that, as for most high resolution spectra of GRBs, the spectrum of the afterglow of GRB050922C is complex. At least seven components contribute to the main absorption system at z = 2.1992. The detection of lines of neutral elements like MgI and the detection of fine-structure levels of the ions FeII, SiII and CII allows us to separate components in the GRB ISM along the line of sight. Moreover, in addition to the main sy...
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