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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]

dc.contributor.authorRapoport, Sharon
dc.contributor.authorOnken, Christopher
dc.contributor.authorWyithe, J Stuart B
dc.contributor.authorTucker , Bradley
dc.contributor.authorLevan, A. J.
dc.date.accessioned2015-12-10T23:17:55Z
dc.identifier.issn0004-637X
dc.identifier.urihttp://hdl.handle.net/1885/65408
dc.description.abstractSixty 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 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.
dc.publisherIOP Publishing
dc.rightsAuthor/s retain copyright
dc.sourceAstrophysical Journal, The
dc.subjectKeywords: Gamma-ray burst: general; gravitational lensing: strong
dc.titleTesting gravitational lensing as the source of enhanced strong Mg II absorption toward gamma-ray bursts
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume754
dc.date.issued2012
local.identifier.absfor020100 - ASTRONOMICAL AND SPACE SCIENCES
local.identifier.ariespublicationf5625xPUB1101
local.type.statusPublished Version
local.contributor.affiliationRapoport, Sharon, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationOnken, Christopher , College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationSchmidt, Brian, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationWyithe, J Stuart B, University of Melbourne
local.contributor.affiliationTucker , Bradley, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationLevan, A. J., University of Warwick
local.bibliographicCitation.issue2
local.bibliographicCitation.startpage1
local.bibliographicCitation.lastpage10
local.identifier.doi10.1088/0004-637X/754/2/139
dc.date.updated2016-02-24T08:37:43Z
local.identifier.scopusID2-s2.0-84864338464
local.identifier.thomsonID000306666700060
dcterms.accessRightsOpen Access
CollectionsANU Research Publications

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