HST/STIS Imaging of the Host Galaxy of GRB980425/SN1998bw

J. U. Fynbo (1); S. Holland (2); M. I. Andersen (3); B. Thomsen (2),; J. Hjorth (1); G. Bjornsson (4); A. O. Jaunsen (5); P. Natarajan (6,7); and; N. Tanvir (8) ((1)University of Copenhagen; (2) University of Aarhus; (3); University of Oulu; (4) University of Iceland; (5) Univsersity of Oslo; (6); Cambridge University; (7) Yale University; (8) University of Hertfordshire)

arXiv:astro-ph/0009014·astro-ph·May 23, 2007·44 cites

HST/STIS Imaging of the Host Galaxy of GRB980425/SN1998bw

J. U. Fynbo (1), S. Holland (2), M. I. Andersen (3), B. Thomsen (2),, J. Hjorth (1), G. Bjornsson (4), A. O. Jaunsen (5), P. Natarajan (6,7), and, N. Tanvir (8) ((1)University of Copenhagen, (2) University of Aarhus, (3), University of Oulu, (4) University of Iceland

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TL;DR

This paper reports HST/STIS imaging of the host galaxy of GRB 980425/SN1998bw, revealing a star-forming galaxy with a point source near the supernova, suggesting possible light curve flattening or underlying star cluster.

Contribution

First high-resolution imaging of the host galaxy of GRB 980425/SN1998bw, identifying a nearby point source and analyzing its implications for supernova light curve and environment.

Findings

01

Host galaxy is actively star-forming and sub-luminous.

02

Detected a point source near the supernova position.

03

The point source is brighter than expected, indicating possible light curve flattening or star cluster contribution.

Abstract

We present HST/STIS observations of ESO 184-G82, the host galaxy of the gamma-ray burst GRB 980425 associated with the peculiar Type Ic supernova SN1998bw. ESO 184-G82 is found to be an actively star forming SBc sub-luminous galaxy. We detect an object consistent with being a point source within the astrometric uncertainty of 0.018 arcseconds of the position of the supernova. The object is located inside a star-forming region and is at least one magnitude brighter than expected for the supernova based on a simple radioactive decay model. This implies either a significant flattening of the light curve or a contribution from an underlying star cluster.

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Taxonomy

TopicsGamma-ray bursts and supernovae · Astrophysical Phenomena and Observations · Stellar, planetary, and galactic studies