Sudilovsky 2009 尘埃状MgII的吸收

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Title:		Dusty MgII Absorbers: Implications for the GRB/Quasar Incidence Discrepancy
Authors:		Sudilovsky, Vladimir
Publication:		eprint arXiv:0904.3227
Publication Date:		04/2009
Origin:		ARXIV
Keywords:		Astrophysics - Cosmology and Extragalactic Astrophysics, Astrophysics - High Energy Astrophysical Phenomena
Comment:		11 pages, 4 figures. ApJ Accepted
Bibliographic Code:		2009arXiv0904.3227S

Abstract

There is nearly a factor of four difference in the number density of intervening MgII absorbers as determined from gamma-ray burst (GRB) and quasar lines of sight. We use a Monte-Carlo simulation to test if a dust extinction bias can account for this discrepancy. We apply an empirically determined relationship between dust column density and MgII rest equivalent width to simulated quasar sight-lines and model the underlying number of quasars that must be present to explain the published magnitude distribution of SDSS quasars. We find that an input MgII number density dn/dz of 0.273 +- 0.002 over the range 0.4 <= z <= 2.0 and with MgII equivalent width W_0 >= 1.0 angstroms accurately reproduces observed distributions. From this value, we conclude that a dust obstruction bias cannot be the sole cause of the observed discrepancy between GRB and quasar sight-lines: this bias is likely to reduce the discrepancy only by ~10%

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