Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008hst..prop11717c&link_type=abstract
HST Proposal ID #11717. Cycle 17
Astronomy and Astrophysics
Astronomy
Scientific paper
We propose a modest {2 WFC3 orbits} HST program to ascertain the origin of the mysterious gamma-ray burst GRB 070125. With a duration of 60 s and a high local {i.e. parsec scale} circum-burst density, GRB 070125 resembles a canonical {i.e. massive-star progenitor} long-duration event. However, we have strong evidence that GRB 070125 exploded in the halo of its host galaxy, far away from the bulk of massive star formation. The UV detection of a compact, star-forming cluster would confirm our original hypothesis that GRB 070125 exploded in a tidal tail formed by galaxy interactions {analogous to the Tadpole and Antenna galaxies} at z = 1.54. Alternatively, the absence of ongoing star formation and the presence of an old stellar population would require a novel explosion process unassociated with massive stars. While the former would open a new path to study star formation and galaxy interactions at high redshift, the latter would require a re-thinking of one of the fundamental tenets of GRB astronomy: the 1:1 mapping between duration and progenitor system.;
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