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Testing gravitational lensing as the source of enhanced strong mg ii absorption toward gamma-ray bursts
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Rapoport, Sharon, Onken, Christopher A., Schmidt, Brian P., Wyithe, J. Stuart B., Tucker, Brad E. and Levan, Andrew J. (2012) Testing gravitational lensing as the source of enhanced strong mg ii absorption toward gamma-ray bursts. The Astrophysical Journal, Volume 754 (Number 2). Article number 139. doi:10.1088/0004-637X/754/2/139 ISSN 0004-637X.
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Official URL: http://dx.doi.org/10.1088/0004-637X/754/2/139
Abstract
Sixty percent of gamma-ray bursts (GRBs) reveal strong Mg II absorbing systems, which is a factor of similar to 2 times the rate seen along lines of sight to quasars. Previous studies argue that the discrepancy in the strong Mg II covering factor is most likely to be the result of either quasars being obscured due to dust or the consequence of many GRBs being strongly gravitationally lensed. We analyze observations of quasars that show strong foreground Mgii absorption. We find that GRB lines of sight pass closer to bright galaxies than would be expected for random lines of sight within the impact parameter expected for strong Mg II absorption. While this cannot be explained by obscuration in the GRB sample, it is a natural consequence of gravitational lensing. Upon examining the particular configurations of galaxies near a sample of GRBs with strong Mg II absorption, we find several intriguing lensing candidates. Our results suggest that lensing provides a viable contribution to the observed enhancement of strong Mg II absorption along lines of sight to GRBs, and we outline the future observations required to test this hypothesis conclusively.
Item Type: | Journal Article | ||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Journal or Publication Title: | The Astrophysical Journal | ||||
Publisher: | Institute of Physics Publishing, Inc. | ||||
ISSN: | 0004-637X | ||||
Official Date: | 1 August 2012 | ||||
Dates: |
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Volume: | Volume 754 | ||||
Number: | Number 2 | ||||
Page Range: | Article number 139 | ||||
DOI: | 10.1088/0004-637X/754/2/139 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
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