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THE SCUBA-2 COSMOLO...
THE SCUBA-2 COSMOLOGY LEGACY SURVEY: ALMA RESOLVES the BRIGHT-END of the SUB-MILLIMETER NUMBER COUNTS
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- Simpson, J. M. (författare)
- Durham University
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- Smail, I. (författare)
- Durham University
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- Swinbank, A.M. (författare)
- Durham University
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- Chapman, S.C. (författare)
- Dalhousie University
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- Geach, J.E. (författare)
- University of Hertfordshire
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- Ivison, R.J. (författare)
- University of Edinburgh,European Southern Observatory (ESO)
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- Thomson, A. P. (författare)
- Durham University
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- Aretxaga, I. (författare)
- Instituto Nacional de Astrofísica, Óptica y Electrońica (INAOE),National Institute of Astrophysics, Optics and Electronics (INAOE)
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- Blain, A.W. (författare)
- University Of Leicester
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- Cowley, W.I. (författare)
- Durham University
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- Chen, C. C. (författare)
- Durham University
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- Coppin, K. E. K. (författare)
- University of Hertfordshire
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- Dunlop, J.S. (författare)
- University of Edinburgh
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- Edge, A. C. (författare)
- Durham University
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- Farrah, D. (författare)
- Virginia Polytechnic Institute and State University (Virginia Tech)
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- Ibar, E. (författare)
- Universidad de Valparaíso,University of Valparaíso
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- Karim, A. (författare)
- Universität Bonn,University of Bonn
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- Knudsen, Kirsten Kraiberg, 1976 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Meijerink, R. (författare)
- Universiteit Leiden (UL),Leiden University (UL)
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- Michalowski, M. J. (författare)
- University of Edinburgh
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- Scott, D. (författare)
- University of British Columbia (UBC)
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- Spaans, M. (författare)
- Rijksuniversiteit Groningen,University of Groningen
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- van der Werf, P.P. (författare)
- Universiteit Leiden (UL),Leiden University (UL)
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(creator_code:org_t)
- 2015
- 2015
- Engelska.
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Ingår i: Astrophysical Journal. - 1538-4357 .- 0004-637X. ; 807:2
- Relaterad länk:
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http://publications.... (primary) (free)
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https://doi.org/10.1...
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https://research.cha...
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Abstract
Ämnesord
Stäng
- We present high-resolution 870 μm Atacama Large Millimeter/sub-millimeter Array (ALMA) continuum maps of 30 bright sub-millimeter sources in the UKIDSS UDS field. These sources are selected from deep, 1 degree2 850 μm maps from the SCUBA-2 Cosmology Legacy Survey, and are representative of the brightest sources in the field (median SSCUBA-2= 8.7 ± 0.4 mJy). We detect 52 sub-millimeter galaxies (SMGs) at >4σ significance in our 30 ALMA maps. In 61-15+19% of the ALMA maps the single-dish source comprises a blend of ≥2 SMGs, where the secondary SMGs are Ultra-luminous Infrared Galaxies (ULIRGs) with LIR ≳ 1012 L⊙. The brightest SMG contributes on average 80-2+6% of the single-dish flux density, and in the ALMA maps containing ≥2 SMGs the secondary SMG contributes 25-5+1% of the integrated ALMA flux. We construct source counts and show that multiplicity boosts the apparent single-dish cumulative counts by 20% at S870 > 7.5 mJy, and by 60% at S870 > 12 mJy. We combine our sample with previous ALMA studies of fainter SMGs and show that the counts are well-described by a double power law with a break at 8.5 ± 0.6 mJy. The break corresponds to a luminosity of ∼6 × 1012 L⊙ or a star formation rate (SFR) of ∼103 M⊙ yr-1. For the typical sizes of these SMGs, which are resolved in our ALMA data with Re = 1.2 ± 0.1 kpc, this yields a limiting SFR density of ∼100 M⊙ yr-1 kpc-2 Finally, the number density of S870 ≳ 2 mJy SMGs is 80 ± 30 times higher than that derived from blank-field counts. An over-abundance of faint SMGs is inconsistent with line-of-sight projections dominating multiplicity in the brightest SMGs, and indicates that a significant proportion of these high-redshift ULIRGs are likely to be physically associated.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- galaxies: starburst
- submillimeter: galaxies
- galaxies: abundances
- galaxies: high-redshift
- galaxies: star formation
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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Till lärosätets databas
- Av författaren/redakt...
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Simpson, J. M.
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Smail, I.
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Swinbank, A.M.
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Chapman, S.C.
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Geach, J.E.
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Ivison, R.J.
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visa fler...
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Thomson, A. P.
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Aretxaga, I.
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Blain, A.W.
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Cowley, W.I.
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Chen, C. C.
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Coppin, K. E. K.
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Dunlop, J.S.
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Edge, A. C.
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Farrah, D.
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Ibar, E.
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Karim, A.
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Knudsen, Kirsten ...
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Meijerink, R.
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Michalowski, M. ...
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Scott, D.
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Spaans, M.
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van der Werf, P. ...
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