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Mass and metallicity scaling relations of high-redshift star-forming galaxies selected by GRBs

Arabsalmani, M, Moller, P, Perley, DA, Freudling, W, Fynbo, JPU, Le Floc'h, E, Zwaan, MA, Schulze, S, Tanvir, NR, Christensen, L, Levan, AJ, Jakobsson, P, Malesani, D, Cano, Z, Covino, S, D'Elia, V, Goldoni, P, Gomboc, A, Heintz, KE, Sparre, M , Postigo, ADU and Vergani, SD (2017) Mass and metallicity scaling relations of high-redshift star-forming galaxies selected by GRBs. Monthly Notices of the Royal Astronomical Society, 473 (3). pp. 3312-3324. ISSN 0035-8711

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Abstract

We present a comprehensive study of the relations between gas kinematics, metallicity and stellar mass in a sample of 82 gamma-ray burst (GRB)-selected galaxies using absorption and emission methods. We find the velocity widths of both emission and absorption profiles to be a proxy of stellar mass. We also investigate the velocity–metallicity correlation and its evolution with redshift. Using 33 GRB hosts with measured stellar mass and metallicity, we study the mass–metallicity relation for GRB host galaxies in a stellar mass range of 108.2–1011.1 M⊙ and a redshift range of z ∼ 0.3–3.4. The GRB-selected galaxies appear to track the mass–metallicity relation of star-forming galaxies but with an offset of 0.15 towards lower metallicities. This offset is comparable with the average error bar on the metallicity measurements of the GRB sample and also the scatter on the mass–metallicity relation of the general population. It is hard to decide whether this relatively small offset is due to systematic effects or the intrinsic nature of GRB hosts. We also investigate the possibility of using absorption-line metallicity measurements of GRB hosts to study the mass–metallicity relation at high redshifts. Our analysis shows that the metallicity measurements from absorption methods can significantly differ from emission metallicities and assuming identical measurements from the two methods may result in erroneous conclusions.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2017 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
Related URLs:
Date Deposited: 21 Feb 2018 12:04
Last Modified: 15 Sep 2018 08:33
DOI or Identification number: 10.1093/mnras/stx2451
URI: http://researchonline.ljmu.ac.uk/id/eprint/8093

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