The enigma of the strong MGll absorbers along GRB sightlines

A. Cucchiara, T. Jones, Jane Camilla Charlton, Derek Brindley Fox, D. Einsig, A. Naranayan

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The startling result of [1] that the number of very strong Mgll absorbers (with equivalent width of the blue component bigger than 1 Å) along gamma-ray burst (GRB) sightlines is nearly four times larger ([dN/dz/ GRB = 0.90) than that along quasar sightlines ([dN/dz/QSO = 0.24) has yet to be understood. We reconsider the possibility that the excess of very strong Mgll absorbers toward GRBs is due to an origin intrinsic to the GRBs testing for possible differences in some properties (line profile, dust abundance and kinematics) of very strong Mgll absorbers found toward GRBs versus those found toward quasars. With a variety of comparisons of equivalent widths of numerous transitions and of the kinematics of the Mgll profiles, we find no significant differences between these samples. This implies that if the excess of very strong Mgll absorbers toward GRBs is caused by a phenomena in the local GRB environment, that the process involved must have some similarities to that which produces very strong Mgll absorbers toward GRB. Although we might be inclined to refute an intrinsic origin of the GRB absorbers, we note that many narrow absorption line systems intrinsic to quasars are quite difficult to distinguish from intervening quasar absorbers despite an obviously different physical origin in accretion disk winds.

Original languageEnglish (US)
Title of host publicationProbing Stellar Populations Out To The Distant Universe - Cefalu 2008 - Proceedings of the International Conference
Pages618-620
Number of pages3
DOIs
StatePublished - Jul 21 2009
EventInternational Conference on Probing Stellar Populations Out To The Distant Universe, Cefalu 2008 - Cefalu, Sicily, Italy
Duration: Sep 7 2008Sep 19 2008

Publication series

NameAIP Conference Proceedings
Volume1111
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

OtherInternational Conference on Probing Stellar Populations Out To The Distant Universe, Cefalu 2008
CountryItaly
CityCefalu, Sicily
Period9/7/089/19/08

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Cucchiara, A., Jones, T., Charlton, J. C., Fox, D. B., Einsig, D., & Naranayan, A. (2009). The enigma of the strong MGll absorbers along GRB sightlines. In Probing Stellar Populations Out To The Distant Universe - Cefalu 2008 - Proceedings of the International Conference (pp. 618-620). (AIP Conference Proceedings; Vol. 1111). https://doi.org/10.1063/1.3141619