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26 April 2024 |
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New search strategy for high z intervening absorbers: GRB021004, a pilot study | | P. M. Vreeswijk
; P. Moller
; J. P. U. Fynbo
; | | Date: |
10 Aug 2003 | | Journal: | Astron.Astrophys. 409 (2003) L5-L8 | | Subject: | astro-ph | | Affiliation: | ESO, Chile), P. Moller (ESO, Garching) and J. P. U. Fynbo (Univ. of Aarhus, Univ. of Copenhagen | | Abstract: | We present near-infrared narrow- and broad-band imaging of the field of GRB021004, performed with ISAAC on the UT1 of the ESO Very Large Telescope. The narrow-band filters were chosen to match prominent emission lines at the redshift of the absorption-line systems found against the early-time afterglow of GRB021004: [OIII] at z=1.38 and Halpha at z=1.60, respectively. For the z=1.38 system we find an emission-line source at an impact parameter of 16", which is somewhat larger than the typical impact parameters of a sample of MgII absorbers at redshifts around unity. Assuming that this tentative redshift-identification is correct, the star formation rate of the galaxy is 13 +- 2 Msun/year. Our study reaches star-formation rate limits (5 sigma) of 5.7 Msun/year at z=1.38, and 7.7 Msun/year at z=1.60. These limits correspond to a depth of roughly 0.13 L*. Any galaxy counterpart of the absorbers nearer to the line of sight either has to be fainter than this limit or not be an emission-line source. | | Source: | arXiv, astro-ph/0308164 | | Services: | Forum | Review | PDF | Favorites | |
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