UV star-formation rates of GRB host galaxies

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dc.creatorChristensen, L.
dc.creatorHjorth, J.
dc.creatorGorosabel, J.
dc.date2004-07-03
dc.date.accessioned2026-07-07T02:13:43Z
dc.date.available2026-07-07T02:13:43Z
dc.descriptionWe study a magnitude-limited sample of 10 gamma-ray burst (GRB) host galaxies with known spectroscopic redshifts (0.43 < z < 2.04). From an analysis of the spectral energy distributions (SEDs), based on published broad-band optical and near-infrared photometry, we derive photometric redshifts, galaxy types, ages of the dominant stellar populations, internal extinctions, and ultraviolet (UV) star-formation rates (SFRs) of the host galaxies. The photometric redshifts are quite accurate despite the heterogeneous nature of the sample: The r.m.s. errors are sigma(z) = 0.21 and sigma(Delta z/(1+z_spec)) = 0.16 with no significant systematic offsets. All the host galaxies have SEDs similar to young starburst galaxies with moderate to low extinction. A comparison of specific SFRs with those of high-redshift galaxies in the Hubble Deep Fields shows that GRB hosts are most likely similar to the field galaxies with the largest specific SFRs. On the other hand, GRB hosts are not significantly younger than starburst field galaxies at similar redshifts, but are found to be younger than a sample of all types of field galaxies.
dc.description15 pages, 7 figures, accepted for publication in A&A
dc.identifierhttps://arxiv.org/abs/astro-ph/0407066
dc.identifierhttp://arxiv.org/abs/astro-ph/0407066
dc.identifierAstron.Astrophys. 425 (2004) 913-926
dc.identifierdoi:10.1051/0004-6361:20040361
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/7910
dc.subjectAstrophysics
dc.titleUV star-formation rates of GRB host galaxies
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