GRB3 - GRBs Observations vs. theory in the Swift era |
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Speaker |
Thoene, Christina |
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Co-autors |
J. P. U. Fynbo, L. Christensen |
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Talk Title |
The state and properties of the interstellar medium in GRB host galaxies |
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Abstract |
Spectroscopic studies of GRB host galaxies can provide us with information about the environment of the GRB or at least allow to study high-redshift galaxies otherwise inaccessible for a closer investigation. Emission line measurements of low redshift hosts seem to confirm the picture that GRBs only occur in metal-poor dwarf galaxies or at least metal-poor regions of larger galaxies and metallicity seems to be an important ingredient for the collapsar-model to work. Afterglow spectra of high-redshift hosts, however, show a generally higher metallicity, a higher density of neutral hydrogen and different properties of metal absorption lines compared to e.g. QSO absorbers. Whether those absorption lines probe the environment of the GRB or only the ISM in/around the host is still an open question. |
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