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arXiv · 1104.2865

Metallicity in the GRB 100316D/SN 2010bh Host Complex

Emily M. Levesque·Edo Berger·Alicia M. Soderberg·Ryan Chornock
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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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Emily M. Levesque, Edo Berger, Alicia M. Soderberg, Ryan Chornock. 2011-04-14. Metallicity in the GRB 100316D/SN 2010bh Host Complex. https://doi.org/10.1088/0004-637x/739/1/23

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