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The GRB Host Galaxies and Redshifts
- Publication Year :
- 2001
-
Abstract
- Observations of GRB host galaxies and their environments in general can provide valuable clues about the nature of progenitors. Bursts are associated with faint, ~ 25 mag, galaxies at cosmological redshifts, ~ 1. The host galaxies span a range of luminosities and morphologies, and appear to be broadly typical for the normal, evolving, actively star-forming galaxy populations at comparable redshifts and magnitudes, but may have somewhat elevated SFR per unit luminosity. There are also spectroscopic hints of massive star formation, from the ratios of [Ne III] and [O II] lines. The observed, unobscured star formation rates are typically a few M_sun/yr, but a considerable fraction of the total star formation in the hosts may be obscured by dust. A census of detected optical afterglows provides a powerful new handle on the obscured fraction of star formation in the universe; the current results suggest that at most a half of the massive star formation was hidden by dust.<br />Comment: Invited review, latex, 8 pages with 3 eps figures, style files included. To appear in proc. "Gamma-Ray Bursts in the Afterglow Era: 2nd Workshop", eds. N. Masetti et al., ESO Astrophysics Symposia, Berlin: Springer Verlag, in press (2001)
- Subjects :
- Astrophysics::High Energy Astrophysical Phenomena
Astrophysics (astro-ph)
FOS: Physical sciences
Astrophysics::Solar and Stellar Astrophysics
Astrophysics::Earth and Planetary Astrophysics
Astrophysics::Cosmology and Extragalactic Astrophysics
Astrophysics
Astrophysics::Galaxy Astrophysics
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....2a506849d93275ce1116697d31f579df