THE METALLICITY AND DUST CONTENT OF A REDSHIFT 5 GAMMA-RAY BURST HOST GALAXY
2014 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 785, no 2, 150- p.Article in journal (Refereed) Published
Observations of the afterglows of long gamma-ray bursts (GRBs) allow the study of star-forming galaxies across most of cosmic history. Here we present observations of GRB 111008A, from which we can measure metallicity, chemical abundance patterns, dust-to-metals ratio (DTM), and extinction of the GRB host galaxy at z = 5.0. The host absorption system is a damped Ly alpha absorber with a very large neutral hydrogen column density of log N (H I)/cm(-2) = 22.30 +/- 0.06 and a metallicity of [S/H] = -1.70 +/- 0.10. It is the highest-redshift GRB with such a precise metallicity measurement. The presence of fine-structure lines confirms the z = 5.0 system as the GRB host galaxy and makes this the highest redshift where Fe II fine-structure lines have been detected. The afterglow is mildly reddened with A(V) = 0.11 +/- 0.04 mag, and the host galaxy has a DTM that is consistent with being equal to or lower than typical values in the Local Group.
Place, publisher, year, edition, pages
2014. Vol. 785, no 2, 150- p.
dust, extinction, galaxies: high-redshift, gamma-ray burst: individual (GRB 111008A)
Astronomy, Astrophysics and Cosmology
IdentifiersURN: urn:nbn:se:su:diva-105227DOI: 10.1088/0004-637X/785/2/150ISI: 000335736800069OAI: oai:DiVA.org:su-105227DiVA: diva2:731869