Chen, Hsiao-Wen 2011 较高红移伽马暴的宿主星系的红外谱

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Title:		Near-infrared spectroscopy of gamma-ray burst host galaxies at z %≳ 1.5: insights into host galaxy dynamics and interpretations of afterglow absorption spectra
Authors:		Chen, Hsiao-Wen
Affiliation:		AA(Department of Astronomy & Astrophysics, Kavli Institute for Cosmological Physics, University of Chicago, Chicago, IL 60637, USA)
Publication:		Monthly Notices of the Royal Astronomical Society, Volume 419, Issue 4, pp. 3039-3047. (MNRAS Homepage)
Publication Date:		02/2012
Origin:		WILEY
Astronomy Keywords:		gamma-ray burst: individual: GRB 050820A, gamma-ray burst: individual: GRB 060418, ISM: kinematics and dynamics, galaxies: formation, galaxies: high-redshift, cosmology: observations
Abstract Copyright:		© 2011 The Author Monthly Notices of the Royal Astronomical Society © 2011 RAS
DOI:		10.1111/j.1365-2966.2011.19944.x
Bibliographic Code:		2012MNRAS.419.3039C

Abstract

This paper presents near-infrared echellette spectra of faint galaxies in the fields around GRB 050820A at redshift z= 2.613 and GRB 060418 at z= 1.490. The spectroscopic data show that both gamma-ray bursts (GRBs) originate in a dynamic environment of interacting galaxies separated by <15 h^-1 kpc in projected distance and |Δv| ≲ 60
? in line-of-sight velocity. The optical afterglows revealed in early-epoch Hubble Space Telescope images are at least 2.5 h^-1 kpc (or 0.4 arcsec) away from the high surface brightness regions of the interacting members, indicating that the GRB events occurred either in the outskirts of a compact star-forming galaxy or in a low surface brightness satellite. Comparisons of the systemic redshifts of the host galaxies and the velocity distribution of absorbing clouds revealed in early-time afterglow spectra further show that the majority of the absorbing clouds are redshifted from these compact star-forming galaxies. These include the gas producing fine-structure absorption lines at physical distances d˜ afew × 100 pc from the GRB afterglow. The lack of blueshifted absorbing clouds and the spatial offset of the GRB event from the star-forming regions make it difficult to attribute the observed large velocity spread (˜200-400 ?) of absorbing gas in the GRB host to galactic-scale outflows. We consider a scenario in which the GRB event occurred in a dwarf satellite of the interacting group and interpret the broad absorption signatures in the afterglow spectra as a collective effect of the turbulent halo gas and the host star-forming interstellar medium. We briefly discuss the implications for the absorption properties observed in the afterglow spectra.

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