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An ALMA survey of submillimetre galaxies in the Extended Chandra Deep Field South: an unbiased study of SMG environments measured with narrow-band imaging

Cornish, Thomas M. (author)
University Of Oxford
Wardlow, J. L. (author)
Wade, Heather (author)
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Sobral, David (author)
Brandt, W. N. (author)
Pennsylvania State University
Cox, P. (author)
Institut d 'Astrophysique de Paris
Dannerbauer, H. (author)
Universidad de la Laguna,University of La Laguna,Instituto de Astrofísica de Canarias
Decarli, R. (author)
Istituto nazionale di astrofisica (INAF)
Gullberg, B. (author)
Danmarks Tekniske Universitet,Technical University of Denmark
Knudsen, Kirsten, 1976 (author)
Chalmers tekniska högskola,Chalmers University of Technology
Stott, John (author)
Swinbank, Mark (author)
Durham University
Walter, F. (author)
Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
van der Werf, P. (author)
Universiteit Leiden (UL),Leiden University (UL)
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 (creator_code:org_t)
2024
2024
English.
In: Monthly Notices of the Royal Astronomical Society. - 0035-8711 .- 1365-2966. ; 533:2, s. 2399-2419
  • Journal article (peer-reviewed)
Abstract Subject headings
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  • Submillimetre galaxies (SMGs) are some of the most extreme star-forming systems in the Universe, whose place in the framework of galaxy evolution is as yet uncertain. It has been hypothesized that SMGs are progenitors of local early-type galaxies, requiring that SMGs generally reside in galaxy cluster progenitors at high redshift. We test this hypothesis and explore SMG environments using a narrow-band VLT/HAWK-I+GRAAL study of H α and [O III] emitters around an unbiased sample of three ALMA-identified and spectroscopically confirmed SMGs at z ∼ 2.3 and ∼ 3.3, where these SMGs were selected solely on spectroscopic redshift. Comparing with blank-field observations at similar epochs, we find that one of the three SMGs lies in an overdensity of emission-line sources on the ∼ 4 Mpc scale of the HAWK-I field of view, with overdensity parameter δg = 2.6+1.4-1.2. A second SMG is significantly overdense only on ≲ 1.6 Mpc scales and the final SMG is consistent with residing in a blank field environment. The total masses of the two overdensities are estimated to be log(Mh/M☉) = 12.1–14.4, leading to present-day masses of log(Mh, z=0/M☉) = 12.9–15.9. These results imply that SMGs occupy a range of environments, from overdense protoclusters or protogroups to the blank field, suggesting that while some SMGs are strong candidates for the progenitors of massive elliptical galaxies in clusters, this may not be their only possible evolutionary pathway.

Subject headings

NATURVETENSKAP  -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)

Keyword

galaxies: photometry
submillimetre: galaxies
galaxies: evolution
galaxies: star formation

Publication and Content Type

art (subject category)
ref (subject category)

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