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On the Ly-alpha emission from gamma-ray burst host galaxies: evidence for low metallicities

J. P. U. Fynbo·P. Jakobsson·P. Moller·J. Hjorth·B. Thomsen·M. I. Andersen·A. S. Fruchter·J. Gorosabel·S. T. Holland·C. Ledoux·H. Pedersen·J. E. Rhoads·M. Weidinger·R. A. M. J. Wijers
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Abstract

We report on the results of a search for Ly-alpha emission from the host galaxy of the z=2.140 GRB 011211 and other galaxies in its surrounding field. We detect Ly-alpha emission from the host as well as from six other galaxies in the field. The restframe equivalent width of the Ly-alpha line from the GRB 011211 host is about 21 AA. This is the fifth detection of Ly-alpha emission out of five possible detections from GRB host galaxies, strongly indicating that GRB hosts, at least at high redshifts, are Ly-alpha emitters. This is intriguing as only about 25% of the Lyman-Break selected galaxies at similar redshifts have Ly-alpha emission lines with restframe equivalent width larger than 20 AA. Possible explanations are i) a preference for GRB progenitors to be metal-poor as expected in the collapsar model, ii) an optical afterglow selection bias against dusty hosts, and iii) a higher fraction of Ly-alpha emitters at the faint end of the luminosity function for high-z galaxies. Of these, the current evidence seems to favour i).

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J. P. U. Fynbo, P. Jakobsson, P. Moller, J. Hjorth, B. Thomsen, M. I. Andersen, A. S. Fruchter, J. Gorosabel, S. T. Holland, C. Ledoux, H. Pedersen, J. E. Rhoads, M. Weidinger, R. A. M. J. Wijers. 2003-06-19. On the Ly-alpha emission from gamma-ray burst host galaxies: evidence for low metallicities. https://doi.org/10.1051/0004-6361%3A20030931

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