Levesque 2011 GRB 100316D/SN 2010bh宿主星系的金属丰度

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Title:		Metallicity in the GRB 100316D/SN 2010bh Host Complex
Authors:		Levesque, Emily M.; Berger, Edo; Soderberg, Alicia M.; Chornock, Ryan
Publication:		eprint arXiv:1104.2865
Publication Date:		04/2011
Origin:		ARXIV
Keywords:		Astrophysics - High Energy Astrophysical Phenomena
Comment:		7 pages, 3 figures, submitted to The Astrophysical Journal
Bibliographic Code:		2011arXiv1104.2865L

Abstract

The recent long-duration GRB 100316D, associated with supernova SN 2010bh and detected by Swift, is one of the nearest GRB-SNe ever observed (z = 0.059). This provides us with a unique opportunity to study the explosion environment on ~kpc scale in relation to the host galaxy complex. Here we present spatially-resolved spectrophotometry of the host galaxy, focusing on both the explosion site and the brightest star-forming regions. Using these data, we extract the spatial profiles of the relevant emission features (Halpha, Hbeta, [OIII] 5007A, and [NII] 6584A), and use these profiles to examine variations in metallicity and star formation rate as a function of position in the host galaxy. We conclude that GRB 100316D/SN2010bh occurred in a low-metallicity host galaxy, and that the GRB-SN explosion site corresponds to the region with the lowest metallicity and highest star formation rate sampled by our observations.

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