Are the hosts of Gamma-Ray Bursts representative of the high redshift starburst galaxies ?

Details Are the hosts of Gamma-Ray Bursts representative of the high redshift starburst galaxies ? Are the hosts of Gamma-Ray Bursts representative of the high redshift starburst galaxies ?

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20370l&link_type=abstract

Spitzer Proposal ID #20370

Mathematics

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Scientific paper

Although eight years have already passed since the discovery of the first Gamma-Ray Burst (GRB) optical counterparts and their host galaxies at cosmological distances, the true origin of these cataclismic events and the nature of their hosting environments is still a matter of strong debate. Recent results from optical data seem indeed to indicate that GRBs occur in rather faint, dust-free and low-mass blue galaxies, while it has also been suggested, from submillimeter and radio data, that GRB hosts could be powerful starbursts luminous in the infrared. Though GRBs are now considered as exciting probes of the very early Universe, such a disunited view clearly hampers the understanding of the cosmic site selection that they operate. Given the distance of the currently-known GRB hosts (median redshift ~1.1), studies performed so far strongly suffered from technical limitations (limited sensitivity in the submillimeter and radio; optical emission lines redshifted out of easily-accessible wavelength ranges). In this program, we propose to address the current controversy about these objects thanks to the unique capabilities of the Spitzer Space Telescope. To this purpose, we will measure the stellar mass and the instantaneous star formation rate of 20 GRB hosts respectively with IRAC and MIPS imaging. Our observations will shed a new light to better understand not only the nature of these galaxies but also how GRBs can be used to map the high redshift Universe.

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