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The galaxy hosts and large-scale environments of short-hard gamma-ray bursts

Prochaska, JX and Bloom, JS and Chen, HW and Foley, RJ and Perley, DA and Ramirez-Ruiz, E and Granot, J and Lee, WH and Pooley, D and Alatalo, K and Hurley, K and Cooper, MC and Dupree, AK and Gerke, BF and Hansen, BMS and Kalirai, JS and Newman, JA and Rich, RM and Richer, H and Stanford, SA and Stern, D and Van Breugel, WJM (2006) The galaxy hosts and large-scale environments of short-hard gamma-ray bursts. The Astrophysical Journal, 642 (2). ISSN 1538-4357

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Abstract

The rapid succession of discoveries of short-duration hard-spectrum gamma-ray bursts (GRBs) has led to unprecedented insights into the energetics of the explosion and nature of the progenitors. Yet short of the detection of a smoking gun, such as a burst of coincident gravitational radiation or a Li-Paczyhski minisupernova, it is unlikely that a definitive claim can be made for the progenitors. As was the case with long-duration soft-spectrum GRBs, however, the expectation is that a systematic study of the hosts and locations of short GRBs could begin to yield fundamental clues as to their nature. We present an aggregate study of the host galaxies of short-duration hard-spectrum GRBs. In particular, we present the Gemini-North and Keck discovery spectra of the galaxies that hosted three short GRBs and a moderate-resolution (R ≈ 6000) spectrum of a fourth host. We find that these short-hard GRBs originate in a variety of low-redshift (z < 1) environments that differ substantially from those of long-soft GRBs, both on individual galaxy scales and on galaxy-cluster scales. Specifically, three of the bursts are found to be associated with old and massive galaxies with no current (<0.1 M ⊙ yr-1) or recent star formation. Two of these galaxies are located within a cluster environment. These observations support an origin from the merger of compact stellar remnants, such as double neutron stars or a neutron star-black hole binary. The fourth event, in contrast, occurred within a dwarf galaxy with a star formation rate exceeding 0.3 M ⊙0 yr-1. Therefore, it appears that like supemovae of Type Ia, the progenitors of short-hard bursts are created in all galaxy types, suggesting a corresponding class with a wide distribution of delay times between formation and explosion. © 2006. The American Astronomical Society. All rights reserved.

Item Type: Article
Uncontrolled Keywords: 0201 Astronomical And Space Sciences, 0305 Organic Chemistry, 0306 Physical Chemistry (Incl. Structural)
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: American Astronomical Society
Date Deposited: 17 May 2017 11:28
Last Modified: 17 May 2017 11:28
DOI or Identification number: 10.1086/501160
URI: http://researchonline.ljmu.ac.uk/id/eprint/6452

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