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The SCUBA-2 Cosmology Legacy Survey: the submillimetre properties of Lyman-break galaxies at z=3-5

K. E. K. Coppin ; J. E. Geach ; O. Almaini ; V. Arumugam ; J. S. Dunlop ; W. G. Hartley ; R. J. Ivison ; C. J. Simpson ; D. J. B. Smith ; A. M. Swinbank ; A. W. Blain ; N. Bourne ; M. Bremer ; C. Conselice ; C. M. Harrison ; A. Mortlock ; S. C. Chapman ; L. J. M. Davies ; D. Farrah ; A. Gibb ; T. Jenness ; A. Karim ; Kirsten Kraiberg Knudsen (Institutionen för rymd- och geovetenskap, Radioastronomi och astrofysik) ; E. Ibar ; M. J. Michalowski ; J. A. Peacock ; D. Rigopoulou ; I. Robson ; D. Scott ; J. Stevens ; P. P. van der Werf
Monthly Notices of the Royal Astronomical Society (0035-8711). Vol. 446 (2015), 2, p. 1293-1304.
[Artikel, refereegranskad vetenskaplig]

We present detections at 850 mu m of the Lyman-break galaxy (LBG) population at z approximate to 3, 4, and 5 using data from the Submillimetre Common User Bolometer Array 2 Cosmology Legacy Survey in the United Kingdom Infrared Deep Sky Survey 'Ultra Deep Survey' field. We employ stacking to probe beneath the survey limit, measuring the average 850 mu m flux density of LBGs at z approximate to 3, 4, and 5 with typical ultraviolet luminosities of L-1700 approximate to 10(29) erg s(-1) Hz(-1). We measure 850 mu m flux densities of (0.25 +/- 0.03), (0.41 +/- 0.06), and (0.88 +/- 0.23) mJy, respectively, finding that they contribute at most 20 per cent to the cosmic far-infrared (IR) background at 850 mu m. Fitting an appropriate range of spectral energy distributions to the z similar to 3, 4, and 5 LBG stacked 24-850 mu m fluxes, we derive IR luminosities of L8-1000 (mu m) approximate to 3.2, 5.5, and 11.0 x 10(11) L-circle dot [and star formation rates (SFRs) of approximate to 50-200M(circle dot) yr(-1)], respectively. We find that the evolution in the IR luminosity density of LBGs is broadly consistent with model predictions for the expected contribution of luminous-to-ultraluminous IR galaxies at these epochs. We observe a positive correlation between stellar mass and IR luminosity and confirm that, for a fixed mass, the reddest LBGs (UV slope beta -> 0) are redder due to dust extinction, with SFR (IR)/SFR (UV) increasing by about an order of magnitude over -2 < beta < 0 with SFR (IR)/SFR (UV) similar to 20 for the reddest LBGs. Furthermore, the most massive LBGs tend to have higher obscured-to-unobscured ratios, hinting at a variation in the obscuration properties across the mass range.

Nyckelord: Star-Forming Galaxies, Deep Field-South, Similar-To 3, Ultraviolet-Selected Galaxies, High-Redshift, Luminosity Function, Stellar Masses, Extragalactic Survey, Number Counts, Dust Emission

Denna post skapades 2015-05-18. Senast ändrad 2015-11-13.
CPL Pubid: 217183


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Institutioner (Chalmers)

Institutionen för rymd- och geovetenskap, Radioastronomi och astrofysik (2010-2017)


Astronomi, astrofysik och kosmologi

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