Prochaska 2008 余辉中NV（氮5）的吸收线

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· arXiv e-print (arXiv:0806.0399)

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Title:		A Survey for NV Absorption at z~z_GRB in GRB Afterglow Spectra: Clues to Gas Near the Progenitor Star
Authors:		Prochaska, Jason X.; Dessauges-Zavadsky, Miroslava; Ramirez-Ruiz, Enrico; Chen, Hsiao-Wen
Publication:		eprint arXiv:0806.0399
Publication Date:		06/2008
Origin:		ARXIV
Keywords:		Astrophysics
Comment:		Accepted to ApJ, 12 pages, 4 color figures
Bibliographic Code:		2008arXiv0806.0399P

Abstract

We survey NV absorption in the afterglow spectra of long-duration gamma-ray bursts (GRBs) with the intent to study highly ionized gas in the galaxies hosting these events. We identify a high incidence (6/7) of spectra exhibiting NV gas with z~z_GRB and the majority show large column densities NV > 10^14 cm^-2. With one exception, the observed line-profiles are kinematically `cold', i.e. they are narrow and have small velocity offset (Dv <> 10^3 cm^-3) environments, typical of molecular clouds. The observations, therefore, primarily constrain the physical conditions -- metallicity, density, velocity fields -- of the gas within the (former) molecular cloud region surrounding the GRB.

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