Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-03-23
Astrophys.J. 599 (2003) 957-963
Astronomy and Astrophysics
Astrophysics
15 pages, 1 color figure. Revised following comments from the referee and references updated. High-resolution version at htt
Scientific paper
10.1086/379310
Given the paucity of empirical constraints, the nature of the newly-recognized phenomena called X-Ray Flashes (XRFs) has been an open question. However, with the recent detections of radio and X-ray afterglow it is finally possible to study the large- and small-scale environments of XRFs. We present Chandra, Hubble Space Telescope (HST), and Keck observations of the fields of XRFs 011030 and 020427. Astrometric comparisons of the X-ray transient positions and the HST images reveal the XRFs to be associated with faint blue galaxies. Photometric evidence of these putative hosts suggests that these two XRFs originated from redshifts less than z ~ 3.5, and thus cannot be due to GRBs at very high redshifts. In both host-burst offsets and host properties, these XRFs could have been drawn from distributions similar to those measured of gamma-ray bursts (GRBs). We conclude with a discussion of the implications of this XRF-GRB host connection for the possible progenitors of XRFs.
Berger Edmond
Bloom Josh S.
Djorgovski Stanislav G.
Fox Daniel
Frail Dale A.
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