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    A deep ALMA image of the Hubble Ultra Deep Field

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    Author
    Dunlop, J. S.
    McLure, R. J.
    Biggs, A. D.
    Geach, J. E.
    Michałowski, M. J.
    Ivison, R. J.
    Rujopakarn, W.
    van Kampen, E.
    Kirkpatrick, A.
    Pope, A.
    Scott, D.
    Swinbank, A. M. cc
    Targett, T. A.
    Aretxaga, I.
    Austermann, J. E.
    Best, P. N.
    Bruce, V. A.
    Chapin, E. L.
    Charlot, S. cc
    Cirasuolo, M.
    Coppin, K.
    Ellis, R. S.
    Finkelstein, S. L.
    Hayward, C. C.
    Hughes, D. H.
    Ibar, E.
    Jagannathan, P. cc
    Khochfar, S.
    Koprowski, M. P.
    Narayanan, D.
    Nyland, K.
    Papovich, C.
    Peacock, J. A.
    Rieke, G. H.
    Robertson, B.
    Vernstrom, T.
    Werf, P. P. van der
    Wilson, G. W. cc
    Yun, M. cc
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    Affiliation
    Univ Arizona, Steward Observ
    Issue Date
    2017-04-01
    Keywords
    galaxies: evolution
    galaxies: high-redshift
    galaxies: starburst
    cosmology: observations
    submillimetre: galaxies
    
    Metadata
    Show full item record
    Publisher
    OXFORD UNIV PRESS
    Citation
    A deep ALMA image of the Hubble Ultra Deep Field 2017, 466 (1):861 Monthly Notices of the Royal Astronomical Society
    Journal
    Monthly Notices of the Royal Astronomical Society
    Rights
    © 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    We present the results of the first, deep Atacama Large Millimeter Array ( ALMA) imaging covering the full similar or equal to 4.5 arcmin(2) of the Hubble Ultra Deep Field ( HUDF) imaged with Wide Field Camera 3/IR on HST. Using a 45-pointing mosaic, we have obtained a homogeneous 1.3-mm image reaching sigma 1.3 similar or equal to 35 mu Jy, at a resolution of similar or equal to 0.7 arcsec. From an initial list of similar or equal to 50 > 3.5 sigma peaks, a rigorous analysis confirms 16 sources with S-1.3 > 120 mu Jy. All of these have secure galaxy counterparts with robust redshifts (< z > = 2.15). Due to the unparalleled supporting data, the physical properties of the ALMA sources are well constrained, including their stellar masses ( M-*) and UV+FIR star formation rates ( SFR). Our results show that stellar mass is the best predictor of SFR in the high-redshift Universe; indeed at z = 2 our ALMA sample contains seven of the nine galaxies in the HUDF withM(*) = 2 x 10(10)M circle dot, and we detect only one galaxy at z > 3.5, reflecting the rapid drop-off of high-mass galaxies with increasing redshift. The detections, coupled with stacking, allow us to probe the redshift/mass distribution of the 1.3-mm background down to S1.3 similar or equal to 10 mu Jy. We find strong evidence for a steep star-forming `main sequence' at z similar or equal to 2, with SFR. M* and a mean specific SFR similar or equal to 2.2 Gyr(-1). Moreover, we find that similar or equal to 85 per cent of total star formation at z similar or equal to 2 is enshrouded in dust, with similar or equal to 65 per cent of all star formation at this epoch occurring in high-mass galaxies ( M-* > 2 x 10(10)M circle dot), for which the average obscured: unobscured SF ratio is similar or equal to 200. Finally, we revisit the cosmic evolution of SFR density; we find this peaks at z similar or equal to 2.5, and that the star-forming Universe transits from primarily unobscured to primarily obscured at z similar or equal to 4.
    ISSN
    0035-8711
    1365-2966
    DOI
    10.1093/mnras/stw3088
    Version
    Final published version
    Sponsors
    European Research Council via the award of an Advanced Grant; EC [312725]; European Research Council via the award of a Consolidator Grant; UK Science and Technology Facilities Council; FWO Pegasus Marie Curie Fellowship; European Research Council through the Advanced Grant [321302, 669253, 670193]; JSPS KAKENHI [JP15K17604]; Chulalongkorn University's CUniverse (CUAASC); Royal Society
    Additional Links
    https://academic.oup.com/mnras/article-lookup/doi/10.1093/mnras/stw3088
    ae974a485f413a2113503eed53cd6c53
    10.1093/mnras/stw3088
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