Other
Scientific paper
Apr 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop..272l&link_type=abstract
Spitzer Proposal ID #272
Other
Scientific paper
The signatures of supernovae detected in the X-ray and optical counterparts of long Gamma-Ray Bursts (GRBs) have led to the conventional wisdom that long GRBs originate from the death of short-lived massive stars and trace therefore the star formation history of the Universe. However, the GRB host galaxies that were studied so far barely overlap with the infrared-luminous sources responsible for the bulk of the star-forming activity at high redshift. These results may seriously question the idea that long GRBs are unbiased tracers of massive star formation, and it is therefore urgent to accurately place the GRB phenomena in their true star formation context. In fact, most GRB hosts were so far pinpointed with optically-bright afterglows, potentially leading to selection effects against dusty sources. To clarify the importance of this bias I propose to carry out a comprehensive study of GRB host galaxies and to focus more specifically on those identified from optically-dark GRBs selected with Swift. Thanks to the unprecedented sensitivity of the Spitzer Space Telescope I will constrain the fraction of bursts originating from massive star formation deeply enshrouded in dust. Comparing the properties of such dark GRB hosts with those of the other galaxies signposted with optically-bright GRB counterparts, I will assess to which extent dark bursts can be used to probe the dark side of the cosmic evolution.
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