Keck Spectroscopy and Hubble Space Telescope Imaging of GRB 000926: Probing a Host Galaxy at z = 2.038
Abstract
We present early-time Keck spectroscopic observations and late-time Hubble Space Telescope (HST) imaging of GRB 000926. The HST images show a small offset between the optical transient and a bright, compact knot in the host galaxy. Combined with the large equivalent widths measured for metallic absorption lines by the Keck Echellette Spectrograph and Imager (ESI) and the Low Resolution Imaging Spectrometer, this indicates that the GRB exploded inside a region of high stellar density. The ESI spectroscopy reveals two absorption systems centered at z = 2.0379 ± 0.0008 with a velocity separation of 168 km s^(-1), which we interpret as being due to individual features in the host galaxy. The ratios of chromium to zinc equivalent widths indicate that the host is depleted in dust relative to local values to a similar degree as damped Lyα systems at the same redshift.
Additional Information
© 2003 The American Astronomical Society. Received 2001 October 24; accepted 2002 November 26. The spectra presented in this paper were obtained at the W. M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California, and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation. We want to thank the staff of the W. M. Keck Observatory for their valuable assistance. We are grateful to L. Cowie and R. Ellis for taking the spectra at the time needed. We thank J. U. Fynbo for his constructive comments, which helped us improve the discussion presented in this paper. This work was supported by NSF and NASA (under contract NAS5-26555). S. R. K. and S. G. D. are supported in part by NSF and NASA. T. J. G. thanks the Fairchild Foundation, and F. A. H. acknowledges support from a Presidential Early Career award.Attached Files
Published - Castro_2003_ApJ_586_128.pdf
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Additional details
- Eprint ID
- 98286
- Resolver ID
- CaltechAUTHORS:20190828-091002940
- W. M. Keck Foundation
- NSF
- NAS5-26555
- NASA
- Sherman Fairchild Foundation
- Caltech President's Fund
- Created
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2019-08-28Created from EPrint's datestamp field
- Updated
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2021-11-16Created from EPrint's last_modified field
- Caltech groups
- Infrared Processing and Analysis Center (IPAC), Division of Geological and Planetary Sciences