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By Guy Monnet (auth.), Jacqueline Bergeron, Guy Monnet (eds.)

ISBN-10: 3662432153

ISBN-13: 9783662432150

ISBN-10: 366243217X

ISBN-13: 9783662432174

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The study of the current sample of G RB host galaxies already provides us with a new view of galaxy formation and evolution. l. Andersen Fig. 1. The observed redshift distribution of GRBs chemical evolution of the universe through the study of absorption line systems along the line of sight. With optimized instrumentation, very detailed in-situ abundance estimates may be obtained, eventually back to the era where the composition was primordial. Within recent years, some evidence has been emerging that the universe may have had non-uniform primordial abundances on large scales (see [5] and references therein), invalidating the cosmological principle (the universe is the same everywhere).

2001). The simultaneous absence of low ionization 0 edges can be explained if most Fe is locked in dust grains. This suggests that high resolution X-ray spectra of GRB afterglows can be used to search for Fe in the dust in the host galaxy ISM. X-ray spectroscopy may then represent a powerful tool, complementing high resolution 0-UV observations, in depicting the chemical evolutionary history of galaxy ISM. It is interesting to note tha t the ISM of GRB host galaxies may have already been detected in Xrays.

1316) than observed to date, allowing very high-resolution spectroscopy with UVES and/or VIMOS. With these spectra, besides obtaining the redshift, one can study the host galaxy and possible metal absorbers on the line-ofsight in detail. If the absorption features are resolved in time, these spectra may allow to see a change in their equivalent widths, which could result from the impact of the burst on the circumburst medium. Some bursts are expected to occur at very high redshifts (z=20), possibly probing the epoch of re-ionization.

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Scientific Drivers for ESO Future VLT/VLTI Instrumentation: Proceedings of the ESO Workshop Held in Garching, Germany, 11–15 June 2001 by Guy Monnet (auth.), Jacqueline Bergeron, Guy Monnet (eds.)


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