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Photograph of Ross Church

Ross Church

Senior lecturer

Photograph of Ross Church

Implications for the origin of short gamma-ray bursts from their observed positions around their host galaxies

Author

  • Ross Church
  • Andrew J. Levan
  • Melvyn B Davies
  • Nial Tanvir

Summary, in English

We present the observed offsets of short-duration gamma-ray bursts (SGRBs) from their putative host galaxies and compare them with the expected distributions of merging compact object binaries, given the observed properties of the hosts. We find that for all but one burst in our sample the offsets are consistent with this model. For the case of bursts with massive elliptical host galaxies, the circular velocities of the hosts' haloes exceed the natal velocities of almost all our compact object binaries. Hence, the extents of the predicted offset distributions for elliptical galaxies are determined largely by their spatial extents. In contrast, for spiral hosts, the galactic rotation velocities are smaller than typical binary natal velocities and the predicted burst offset distributions are more extended than the galaxies. One SGRB, 060502B, apparently has a large radial offset that is inconsistent with an origin in a merging galactic compact binary. Although it is plausible that the host of GRB 060502B is misidentified, our results show that the large offset is compatible with a scenario where at least a few per cent of SGRBs are created by the merger of compact binaries that form dynamically in globular clusters.

Department/s

  • Lund Observatory

Publishing year

2011

Language

English

Pages

2004-2014

Publication/Series

Monthly Notices of the Royal Astronomical Society

Volume

413

Issue

3

Document type

Journal article

Publisher

Oxford University Press

Topic

  • Astronomy, Astrophysics and Cosmology

Keywords

  • binaries: general
  • gamma-ray burst: general

Status

Published

ISBN/ISSN/Other

  • ISSN: 1365-2966