Far-infrared dissection of the GRB980425/SN1998bw host galaxy : toward an understanding of the origin of Gamma-Ray Bursts

Details Far-infrared dissection of the GRB980425/SN1998bw host galaxy : toward an understanding of the origin of Gamma-Ray Bursts Far-infrared dissection of the GRB980425/SN1998bw host galaxy : toward an understanding of the origin of Gamma-Ray Bursts

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop30251l&link_type=abstract

Spitzer Proposal ID #30251

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Scientific paper

As part of a previous survey of GRB host galaxies that we performed with Spitzer at 4.5, 8.0 and 24mic, we discovered in the host of GRB980425/1998bw (z=0.0085) a particularly luminous HII region contributing more than 75% to the total mid-IR emission of the underlying galaxy. This IR-luminous HII region is associated with a compact super star cluster recently proposed as the original environment where the precursor of the GRB was born. It exhibits indeed powerful massive star formation as well as signatures of the Wolf-Rayet stars now considered as the most likely progenitors of long GRBs. We propose to image this super star cluster at 70mic and 160mic with MIPS. The combination of these observations with our existing data at shorter wavelengths will lead to a thorough characterization of its properties and to the most detailed panchromatic view of a GRB host galaxy ever achieved so far. Comparisons with other well-studied dust-obscured HII regions of the local Universe will allow us to infer more stringent constraints on the physical conditions favoring the trigger of long GRBs in star-forming environments.

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