Preprint article · Journal article
Spatially-resolved dust properties of the GRB 980425 host galaxy
Ghent University1
ASI Science Data Center2
University of La Laguna3
Université Paris Cité4
University of Copenhagen5
University of Edinburgh6
Pierre and Marie Curie University - University of Paris VI7
Karl Schwarzschild Observatory8
Stockholm University9
University of Leicester10
Instituto de Astrofísica de Andalucía11
National Institute for Astrophysics12
Leiden University13
Max Planck Institute14
Vrije Universiteit Brussel15
Department of Physics, Technical University of Denmark16
Plasma Physics and Fusion Energy, Department of Physics, Technical University of Denmark17
Aix-Marseille Université18
University of Sydney19
European Space Astronomy Centre20
...and 10 moreGamma-ray bursts (GRBs) have been proposed as a tool to study star formation in the Universe, so it is crucial to investigate whether their host galaxies and immediate environments are in any way special compared with other star-forming galaxies. Here we present spatially resolved maps of dust emission of the host galaxy of the closest known GRB 980425 at z=0.0085 using our new high-resolution observations from Herschel, APEX, ALMA and ATCA.
We modeled the spectral energy distributions of the host and of the star-forming region displaying the Wolf-Rayet signatures in the spectrum (WR region), located 800 pc away from the GRB position. The host is characterised by low dust content and high fraction of UV-visible star-formation, similar to other dwarf galaxies.
Such galaxies are abundant in the local universe, so it is not surprising to find a GRB in one of them, assuming the correspondence between the GRB rate and star-formation. The WR region contributes substantially to the host emission at the far-infrared, millimeter and radio wavelengths and we propose this to be a consequence of its high gas density.
If dense environments are also found close to the positions of other GRBs, then the ISM density should also be considered as an important factor influencing whether a given stellar population can produce a GRB, in a similar way as metallicity.
Language: | English |
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Publisher: | EDP Sciences |
Year: | 2014 |
Pages: | A70 |
ISSN: | 14320746 and 00046361 |
Types: | Preprint article and Journal article |
DOI: | 10.1051/0004-6361/201322843 |
ORCIDs: | 0000-0002-4571-2306 , 0000-0002-4465-8264 and Rasmussen, Jesper |