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Testing gravitational lensing as the source of enhanced strong Mg II absorption toward gamma-ray bursts

Rapoport, Sharon; Onken, Christopher; Wyithe, J Stuart B; Tucker , Bradley; Levan, A. J.

Description

Sixty percent of gamma-ray bursts (GRBs) reveal strong Mg II absorbing systems, which is a factor of 2times 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 Mg II absorption. We find that GRB lines of sight...[Show more]

CollectionsANU Research Publications
Date published: 2012
Type: Journal article
URI: http://hdl.handle.net/1885/65408
Source: Astrophysical Journal, The
DOI: 10.1088/0004-637X/754/2/139

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