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Detection of three gamma-ray burst host galaxies at z ∼ 6

McGuire, JTW and Tanvir, NR and Levan, AJ and Trenti, M and Stanway, ER and Shull, JM and Wiersema, K and Perley, DA and Starling, RLC and Bremer, M and Stocke, JT and Hjorth, J and Rhoads, JE and Curtis-Lake, E and Schulze, S and Levesque, EM and Robertson, B and Fynbo, JPU and Ellis, RS and Fruchter, AS (2016) Detection of three gamma-ray burst host galaxies at z ∼ 6. The Astrophysical Journal, 825 (2). ISSN 1538-4357

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Abstract

The American Astronomical Society. All rights reserved.Long-duration gamma-ray bursts (GRBs) allow us to pinpoint and study star-forming galaxies in the early universe, thanks to their orders of magnitude brighter peak luminosities compared to other astrophysical sources, and their association with the deaths of massive stars. We present Hubble Space Telescope Wide Field Camera 3 detections of three Swift GRB host galaxies lying at redshifts z = 5.913 (GRB 130606A), z = 6.295 (GRB 050904), and z = 6.327 (GRB 140515A) in the F140W (wide-JH band, λobs ∼ 1.4μm) filter. The hosts have magnitudes (corrected for Galactic extinction) of mλobsAB = 26.34-0.16+0.14, 27.56-0.22+0.18, and 28.30-0.33+0.25, respectively. In all three cases, the probability of chance coincidence of lower redshift galaxies is ≲2%, indicating that the detected galaxies are most likely the GRB hosts. These are the first detections of high-redshift () GRB host galaxies in emission. The galaxies have luminosities in the range 0.1-0.6 Lz=6∗(with M1600∗ = -20.95±0.12) and half-light radii in the range 0.6-0.9 kpc. Both their half-light radii and luminosities are consistent with existing samples of Lyman-break galaxies at z∼6. Spectroscopic analysis of the GRB afterglows indicate low metallicities ([M/H]≲-1) and low dust extinction (AV ≲ 0.1) along the line of sight. Using stellar population synthesis models, we explore the implications of each galaxy's luminosity for its possible star-formation history and consider the potential for emission line metallicity determination with the upcoming James Webb Space Telescope. © 2016.

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 Feb 2017 12:04
Last Modified: 09 Sep 2017 09:00
DOI or Identification number: 10.3847/0004-637X/825/2/135
URI: http://researchonline.ljmu.ac.uk/id/eprint/5582

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