Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 459, Issue 3, Pages 3356-3362Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stw905
Keywords
radiation mechanisms: non-thermal; gamma-ray burst: general; radio continuum: general; X-rays: general
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Funding
- Australian Research Council [DP110102034]
- Australian Research Council Centre of Excellence for All-sky Astrophysics (CAASTRO) [CE110001020]
- NASA through the Astrophysics Theory Programme [NNX10AF62G]
- NSF [AST-1009863]
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Current models suggest gamma-ray bursts could be used as a way of probing Population-III stars - the first stars in the early Universe. In this paper, we use numerical simulations to demonstrate that late-time radio observations of gamma-ray burst afterglows could provide a means of identifying bursts that originate from Population-III stars, if these were highly massive, independently from their redshift. We then present the results from a pilot study using the Australia Telescope Compact Array at 17 GHz, designed to test the hypothesis that there may be Population-III gamma-ray bursts amongst the current sample of known events. We observed three candidates plus a control gamma-ray burst, and make no detections with upper limits of 20-40 mu Jy at 500-1300 d post-explosion.
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