Artículo
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.
Fecha de publicación:
12/2008
Editorial:
EDP Sciences
Revista:
Astronomy and Astrophysics
ISSN:
0004-6361
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
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 system, we analyzed the five intervening systems between z = 2.077 and z = 1.5664 identified along the GRB line of sight. Conclusions. GRB afterglow spectra are very complex, but full of information. This can be used to disentangle the contribution of the different parts of the GRB host galaxy and to study their properties. Our metallicity estimates agree with the scenario of GRBs exploding in low metallicity galaxies
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Articulos(IAFE)
Articulos de INST.DE ASTRONOMIA Y FISICA DEL ESPACIO(I)
Articulos de INST.DE ASTRONOMIA Y FISICA DEL ESPACIO(I)
Citación
Piranomonte, S.; Ward, P. A.; Fiore, F.; Vergani, S. D.; D'Elia, V.; et al.; Probing the complex environments of GRB host galaxies and intervening systems: high resolution spectroscopy of GRB050922C; EDP Sciences; Astronomy and Astrophysics; 492; 3; 12-2008; 775-785
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