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Physical Characteri...
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Casey, Caitlin M.The University of Texas at Austin, USA
(author)
Physical Characterization of an Unlensed, Dusty Star-forming Galaxy at z = 5.85
- Article/chapterEnglish2019
Publisher, publication year, extent ...
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2019-12-11
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American Astronomical Society,2019
Numbers
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LIBRIS-ID:oai:research.chalmers.se:9a49870e-8520-4e3e-b8c2-ebb4d88177b2
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https://research.chalmers.se/publication/515033URI
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https://doi.org/10.3847/1538-4357/ab52ffDOI
Supplementary language notes
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Language:English
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Summary in:English
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Subject category:art swepub-publicationtype
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Subject category:ref swepub-contenttype
Notes
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We present a physical characterization of MM J100026.36+021527.9 (a.k.a. "Mambo-9"), a dusty star-forming galaxy (DSFG) at z = 5.850 ± 0.001. This is the highest-redshift unlensed DSFG (and fourth most distant overall) found to date and is the first source identified in a new 2 mm blank-field map in the COSMOS field. Though identified in prior samples of DSFGs at 850 μm to 1.2 mm with unknown redshift, the detection at 2 mm prompted further follow-up as it indicated a much higher probability that the source was likely to sit at z > 4. Deep observations from the Atacama Large Millimeter and submillimeter Array (ALMA) presented here confirm the redshift through the secure detection of 12CO(J = 6→5) and p-H2O (21,1 → 20,2). Mambo-9 is composed of a pair of galaxies separated by 6 kpc with corresponding star formation rates of 590 M o˙ yr-1 and 220 M o˙ yr-1, total molecular hydrogen gas mass of (1.7 ± 0.4) × 1011 M o˙, dust mass of (1.3 ± 0.3) × 109 M o˙, and stellar mass of (3.2-1.5+1.0) × 109 M o˙. The total halo mass, (3.3 ± 0.8) × 1012 M o˙, is predicted to exceed 1015 M o˙ by z = 0. The system is undergoing a merger-driven starburst that will increase the stellar mass of the system tenfold in τ depl = 40-80 Myr, converting its large molecular gas reservoir (gas fraction of 96-2+1) into stars. Mambo-9 evaded firm spectroscopic identification for a decade, following a pattern that has emerged for some of the highest-redshift DSFGs found. And yet, the systematic identification of unlensed DSFGs like Mambo-9 is key to measuring the global contribution of obscured star formation to the star formation rate density at z ⪆ 4, the formation of the first massive galaxies, and the formation of interstellar dust at early times (≲1 Gyr).
Subject headings and genre
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Zavala, J. A.The University of Texas at Austin, USA
(author)
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Aravena, ManuelUniversidad Diego Portales,Diego Portales University
(author)
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Béthermin, MatthieuLaboratoire d'Astrophysique de Marseille
(author)
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Caputi, Karina I.Köpenhamns universitet,University of Copenhagen,Rijksuniversiteit Groningen,University of Groningen
(author)
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Champagne, Jaclyn B.The University of Texas at Austin, USA
(author)
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Clements, D. L.Imperial College of Science, Technology and Medicine
(author)
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Cunha, E. DaUniversity of Western Australia,ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D),Australian National University
(author)
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Drew, PatrickThe University of Texas at Austin, USA
(author)
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Finkelstein, Steven L.The University of Texas at Austin, USA
(author)
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Hayward, Christopher C.Flatiron Institute
(author)
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Kartaltepe, Jeyhan S.Rochester Institute of Technology
(author)
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Knudsen, Kirsten Kraiberg,1976Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)kraiberg
(author)
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Koekemoer, Anton M.Space Telescope Science Institute (STScI)
(author)
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Magdis, Georgios E.Köpenhamns universitet,University of Copenhagen,Niels Bohr Institute
(author)
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Man, AllisonUniversity of Toronto
(author)
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Manning, Sinclaire M.The University of Texas at Austin, USA
(author)
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Scoville, N. Z.California Institute of Technology (Caltech)
(author)
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Sheth, K.National Aeronautics and Space Administration (NASA)
(author)
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Spilker, JustinThe University of Texas at Austin, USA
(author)
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Staguhn, JohannesNASA Goddard Space Flight Center,Johns Hopkins University
(author)
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Talia, MargheritaUniversita di Bologna,University of Bologna
(author)
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Taniguchi, YoshiakiThe Open University of Japan
(author)
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Toft, SuneKöpenhamns universitet,University of Copenhagen,Niels Bohr Institute
(author)
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Treister, E.Pontificia Universidad Catolica de Chile
(author)
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Yun, MinUniversity of Massachusetts
(author)
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The University of Texas at Austin, USAUniversidad Diego Portales
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In:Astrophysical Journal: American Astronomical Society887:11538-43570004-637X
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Zavala, J. A.
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Aravena, Manuel
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Béthermin, Matth ...
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Clements, D. L.
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Cunha, E. Da
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Drew, Patrick
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Man, Allison
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Manning, Sinclai ...
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Scoville, N. Z.
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Sheth, K.
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Spilker, Justin
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Staguhn, Johanne ...
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Toft, Sune
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