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On the nature of the 'hostless' short GRBs

Tunnicliffe, RL and Levan, AJ and Tanvir, NR and Rowlinson, A and Perley, DA and Bloom, JS and Cenko, SB and O'Brien, PT and Cobb, BE and Wiersema, K and Malesani, D and de Ugarte Postigo, A and Hjorth, J and Fynbo, JPU and Jakobsson, P (2014) On the nature of the 'hostless' short GRBs. Monthly Notices of the Royal Astronomical Society, 437 (2). pp. 1495-1510. ISSN 0035-8711

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Abstract

A significant proportion (~30 per cent) of the short-duration gamma-ray bursts (SGRBs)localized by Swift have no detected host galaxy coincident with the burst location to deeplimits, and also no high-likelihood association with proximate galaxies on the sky. TheseSGRBs may represent a population at moderately high redshifts (z≳ 1), for which the hostsare faint, or a population where the progenitor has been kicked far from its host or is sited in anoutlying globular cluster. We consider the afterglow and host observations of three 'hostless'bursts (GRBs 090305A, 091109B and 111020A), coupled with a new observational diagnosticto aid the association of SGRBs with putative host galaxies to investigate this issue. Consideringthe well localized SGRB sample, 7/25 SGRBs can be classified as 'hostless' by our diagnostic.Statistically, however, the proximity of these seven SGRBs to nearby galaxies is higher thanis seen for random positions on the sky. This suggests that the majority of 'hostless' SGRBshave likely been kicked from proximate galaxies at moderate redshift. Though this result stillsuggests only a small proportion of SGRBs will be within the Advanced Laser InterferometerGravitational Wave Observatory horizon for neutron star-neutron star (NS) or neutron star-black hole (BH) inspiral detection (z~0.1), in the particular case of GRB 111020A a plausiblehost candidate is at z = 0.02.©2013 The Authors.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: 0201 Astronomical And Space Sciences
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Date Deposited: 22 Feb 2017 09:45
Last Modified: 07 Sep 2017 18:05
DOI or Identification number: 10.1093/mnras/stt1975
URI: http://researchonline.ljmu.ac.uk/id/eprint/5698

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