The MUSE view of the host galaxy of GRB 100316D


Type
Article
Change log
Authors
Izzo, L 
Thäone, CC 
Schulze, S 
Mehner, A 
Flores, H 
Abstract

The low distance, z=0.0591, of GRB 100316D and its association with SN 2010bh represent two important motivations for studying this host galaxy and the GRB's immediate environment with the Integral-Field Spectrographs like VLT/MUSE. Its large field-of-view allows us to create 2D maps of gas metallicity, ionization level, and the star-formation rate distribution maps, as well as to investigate the presence of possible host companions. The host is a late-type dwarf irregular galaxy with multiple star-forming regions and an extended central region with signatures of on-going shock interactions. The GRB site is characterized by the lowest metallicity, the highest star-formation rate and the youngest ( 20-30 Myr) stellar population in the galaxy, which suggest a GRB progenitor stellar population with masses up to 20 -- 40 M. We note that the GRB site has an offset of $\sim660pcfromthemostluminousSFregioninthehost.TheobservedSFactivityinthisgalaxymayhavebeentriggeredbyarelativelyrecentgravitationalencounterbetweenthehostandasmallundetected(L_{H\alpha} \leq 10^{36}$ erg/s) companion.

Description
Keywords
gamma-ray burst: general, gamma-ray burst: individual: GRB 100316D, galaxies: abundances, galaxies: general, galaxies: star formation
Journal Title
Monthly Notices of the Royal Astronomical Society
Conference Name
Journal ISSN
0035-8711
1365-2966
Volume Title
472
Publisher
Oxford University Press (OUP)
Sponsorship
European Research Council (695671)