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Establishing an analogue population for the most distant galaxies
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Stanway, Elizabeth R. and Davies, L. J. M. (2014) Establishing an analogue population for the most distant galaxies. Monthly Notices of the Royal Astronomical Society, Volume 439 (Number 3). pp. 2474-2484. doi:10.1093/mnras/stu104 ISSN 0035-8711.
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Official URL: http://dx.doi.org/10.1093/mnras/stu104
Abstract
Lyman break analogues (LBAs) are local galaxies selected to match a more distant (usually z ∼ 3) galaxy population in luminosity, UV-spectral slope and physical characteristics, and so provide an accessible laboratory for exploring their properties. However, as the Lyman break technique is extended to higher redshifts, it has become clear that the Lyman break galaxies (LBGs) at z ∼ 3 are more massive, luminous, redder, more extended and at higher metallicities than their z ∼ 5 counterparts. Thus extrapolations from the existing LBA samples (which match z = 3 properties) have limited value for characterizing z > 5 galaxies, or inferring properties unobservable at high redshift. We present a new pilot sample of 21 compact star-forming galaxies in the local (0.05 < z < 0.25) Universe, which are tuned to match the luminosities and star formation volume densities observed in z ≳ 5 LBGs. The analysis of optical emission line indices suggests that these sources have typical metallicities of a few tenths solar (again, consistent with the distant population). We also present radio continuum observations of a subset of this sample (13 sources) and determine that their radio fluxes are consistent with those inferred from the ultraviolet, precluding the presence of a heavily obscured active galactic nuclei or significant dusty star formation.
Item Type: | Journal Article | ||||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||
Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | ||||||||
Publisher: | Oxford University Press | ||||||||
ISSN: | 0035-8711 | ||||||||
Official Date: | 11 April 2014 | ||||||||
Dates: |
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Volume: | Volume 439 | ||||||||
Number: | Number 3 | ||||||||
Page Range: | pp. 2474-2484 | ||||||||
DOI: | 10.1093/mnras/stu104 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Restricted or Subscription Access |
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