We present the first high-resolution observations of the optical afterglow of a gamma-ray burst. The spectra show that the matter of the host galaxy in the circumburst region is complex, with many components contributing to each system. Also the presence of low- and high-ionisation lines allows rather strong constraints on the gas ionisation parameters of the various components to be derived. These can be interpreted as density fluctuations on top of a regular R-2 wind density profile.

A flash in the dark: UVES/VLT high-resolution spectroscopy of GRB afterglows

FRONTERA, Filippo;
2005

Abstract

We present the first high-resolution observations of the optical afterglow of a gamma-ray burst. The spectra show that the matter of the host galaxy in the circumburst region is complex, with many components contributing to each system. Also the presence of low- and high-ionisation lines allows rather strong constraints on the gas ionisation parameters of the various components to be derived. These can be interpreted as density fluctuations on top of a regular R-2 wind density profile.
Ward, P; MEURS E. J., A; Fiore, F; D'Elia, V; Lazzati, D; Perna, R; Sbordone, L; Stratta, G; ANTONELLI L., A; Chincarini, G; Covino, S; DI PAOLA, A; Fontana, A; Ghisellini, G; Israel, G; Frontera, Filippo; Marconi, G; Stella, L; Vietri, M; Zerbi, F.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/494477
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