Bibcode
Bianchi, S.; Basa, S.; Baes, M.; Rasmussen, J.; Gentile, G.; Savaglio, S.; Palazzi, E.; Hunt, L. K.; Michałowski, M. J.; Ferrero, P.; D'Elia, V.; Cuby, J.-G.; Covino, S.; Burlon, D.; Castro Cerón, J. M.; Berta, S.; Götz, D.; Pian, E.; Murphy, T.; Le Floc'h, E.; Malesani, D.; Le Borgne, D.; Koprowski, M. P.; Jhorth, J.; Xu, D.; Vergani, S. D.; van der Werf, P.; Watson, D.; de Ugarte Postigo, A.; Tanvir, N. R.; Sollerman, J.; Piranomonte, S.; Rossi, A.
Referencia bibliográfica
Astronomy and Astrophysics, Volume 562, id.A70, 13 pp.
Fecha de publicación:
2
2014
Revista
Número de citas
41
Número de citas referidas
38
Descripción
Gamma-ray bursts (GRBs) have been proposed as a tool for studying 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 galaxyof the closest known GRB 980425
at z = 0.0085 using our new high-resolution observations from Herschel,
Atacama Pathfinder Experiment (APEX), Atacama Large Millimeter Array
(ALMA) and Australia Telescope Compact Array (ATCA). We modelled 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 from the GRB position. The host is characterised by low
dust content and a high fraction of UV-visible star formation, similar
to other dwarf galaxies. These 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, millimetre, and radio wavelengths and we propose that this
is 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, along with metallicity, an important factor
influencing whether a given stellar population can produce a GRB.
Herschel is an ESA space observatory with science instruments provided
by European-led Principal Investigator consortia and with important
participation from NASA.
Reduced images as FITS files are only available at the CDS via anonymous
ftp to http://cdsarc.u-strasbg.fr (ftp://130.79.128.5) or via
http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/562/A70.
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