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First Two Host Galaxies of X‐Ray Flashes: XRF 011030 and XRF 020427

Bloom, J. S. and Fox, D. and van Dokkum, P. G. and Kulkarni, S. R. and Berger, E. and Djorgovski, S. G. and Frail, D. A. (2003) First Two Host Galaxies of X‐Ray Flashes: XRF 011030 and XRF 020427. Astrophysical Journal, 599 (2). pp. 957-963. ISSN 0004-637X. doi:10.1086/379310.

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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.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Bloom, J. S.0000-0002-7777-216X
Fox, D.0000-0002-3714-672X
van Dokkum, P. G.0000-0002-8282-9888
Kulkarni, S. R.0000-0001-5390-8563
Berger, E.0000-0002-9392-9681
Djorgovski, S. G.0000-0002-0603-3087
Additional Information:© 2003 The American Astronomical Society. Received 2003 March 22; accepted 2003 August 25. We thank the referee for insightful comments on the original version of the manuscript. We thank D. Kaplan for assistance with the NIR data reductions. J. S. B. is supported by a Junior Fellowship to the Harvard Society of Fellows and by a generous research grant from the Harvard-Smithsonian Center for Astrophysics. S. R. K. and S. G. D. thank the NSF for support. Support for proposal number HST GO-09180.01-A was provided by NASA through a grant from Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555. The authors wish to extend special thanks to those of Hawaiian ancestry on whose sacred mountain we are privileged to be guests. Without their generous hospitality, some of the observations presented here would not have been possible.
Funding AgencyGrant Number
Harvard UniversityUNSPECIFIED
NASAHST GO-09180.01-A
Subject Keywords:gamma rays: bursts — X-rays: bursts
Issue or Number:2
Record Number:CaltechAUTHORS:20190828-145414550
Persistent URL:
Official Citation:J. S. Bloom et al 2003 ApJ 599 957
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:98323
Deposited By: Tony Diaz
Deposited On:28 Aug 2019 22:06
Last Modified:16 Nov 2021 17:38

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