University of Hertfordshire

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From the same journal

By the same authors

Documents

  • S. M. Stach
  • U. Dudzevičiūtė
  • I. Smail
  • A. M. Swinbank
  • F. X. An
  • O. Almaini
  • V. Arumugam
  • A. W. Blain
  • S. C. Chapman
  • C. J. Conselice
  • E. A. Cooke
  • E. da Cunha
  • J. S. Dunlop
  • D. Farrah
  • B. Gullberg
  • J. A. Hodge
  • R. J. Ivison
  • Dale D. Kocevski
  • M. J. Michałowski
  • Takamitsu Miyaji
  • D. Scott
  • J. L. Wardlow
  • Axel Weiss
  • P. van der Werf
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Original languageEnglish
Article numberstz1536
Number of pages21
Pages (from-to)4648–4668
JournalMonthly Notices of the Royal Astronomical Society
Journal publication date6 Jun 2019
Volume487
Issue4
Early online date6 Jun 2019
DOIs
Publication statusE-pub ahead of print - 6 Jun 2019

Abstract

We present the catalogue and basic properties of sources in AS2UDS, an 870-\mum continuum survey with the Atacama Large Millimetre/sub-millimetre Array (ALMA) of 716 single-dish sub-millimetre sources detected in the UKIDSS/UDS field by the SCUBA-2 Cosmology Legacy Survey. In our sensitive ALMA follow-up observations, we detect 708 sub-millimetre galaxies (SMGs) at >4.3σ significance across the ∼1°-diameter field. We combine our precise ALMA positions with the extensive multiwavelength coverage in the UDS field which yields spectral energy distributions for our SMGs and a median redshift of z phot = 2.61 ± 0.09. This large sample reveals a statistically significant trend of increasing sub-millimetre flux with redshift suggestive of galaxy downsizing. 101 ALMA maps do not show a > 4.3σ SMG, but we demonstrate from stacking Herschel SPIRE observations at these positions, that the vast majority of these blank maps correspond to real single-dish sub-millimetre sources. We further show that these blank maps contain an excess of galaxies at z phot = 1.5-4 compared to random fields, similar to the redshift range of the ALMA-detected SMGs. In addition, we combine X-ray and mid-infrared active galaxy nuclei activity (AGN) indicators to yield a likely range for the AGN fraction of 8-28 per cent in our sample. Finally, we compare the redshifts of this population of high-redshift, strongly star-forming galaxies with the inferred formation redshifts of massive, passive galaxies being found out to z ∼ 2, finding reasonable agreement - in support of an evolutionary connection between these two classes of massive galaxy.

Notes

Submitted to MNRAS; Comments welcome. Full catalogue will be made publicly available on acceptance of paper

ID: 16895923