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Physical Characterization of an Unlensed Dusty Star-Forming Galaxy at z = 5.85

Casey, Caitlin M. and Zavala, Jorge A. and Aravena, Manuel and Béthermin, Matthieu and Caputi, Karina I. and Champagne, Jaclyn B. and Clements, David L. and da Cunha, Elisabete and Drew, Patrick and Finkelstein, Steven L. and Hayward, Christopher C. and Kartaltepe, Jeyhan S. and Knudsen, Kirsten K. and Koekemoer, Anton M. and Magdis, Georgios E. and Man, Allison and Manning, Sinclaire M. and Scoville, Nick Z. and Sheth, Kartik and Spilker, Justin and Staguhn, Johannes and Talia, Margherita and Taniguchi, Yoshiaki and Toft, Sune and Treister, Ezequiel and Yun, Min (2019) Physical Characterization of an Unlensed Dusty Star-Forming Galaxy at z = 5.85. Astrophysical Journal, 887 (1). Art. No. 55. ISSN 0004-637X. doi:10.3847/1538-4357/ab52ff.

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We present a physical characterization of MMJ100026.36+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 2mm blank-field map in the COSMOS field. Though identified in prior samples of DSFGs at 850μm-1.2mm with unknown redshift, the detection at 2mm 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 comprised of a pair of galaxies separated by 6kpc with corresponding star-formation rates of 590M⊙yr⁻¹ and 220M⊙yr⁻¹ total molecular hydrogen gas mass of (1.7±0.4)×10¹¹M⊙, dust mass of (1.3±0.3)×10⁹M⊙ and stellar mass of (3.2+1.0−1.5)×10⁹M⊙. The total halo mass, (3.3±0.8)×10¹²M⊙, is predicted to exceed >10¹⁵M⊙ by z = 0. The system is undergoing a merger-driven starburst which will increase the stellar mass of the system tenfold in τ_(depl) = 40−80Myr, converting its large molecular gas reservoir (gas fraction of 96^(+1)_(−2)%) 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 (<1Gyr).

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Casey, Caitlin M.0000-0002-0930-6466
Zavala, Jorge A.0000-0002-7051-1100
Aravena, Manuel0000-0002-6290-3198
Béthermin, Matthieu0000-0002-3915-2015
Caputi, Karina I.0000-0001-8183-1460
Champagne, Jaclyn B.0000-0002-6184-9097
Clements, David L.0000-0002-9548-5033
da Cunha, Elisabete0000-0001-9759-4797
Drew, Patrick0000-0003-3627-7485
Finkelstein, Steven L.0000-0001-8519-1130
Hayward, Christopher C.0000-0003-4073-3236
Kartaltepe, Jeyhan S.0000-0001-9187-3605
Knudsen, Kirsten K.0000-0002-7821-8873
Koekemoer, Anton M.0000-0002-6610-2048
Magdis, Georgios E.0000-0002-4872-2294
Man, Allison0000-0003-2475-124X
Scoville, Nick Z.0000-0002-0438-3323
Sheth, Kartik0000-0002-5496-4118
Spilker, Justin0000-0003-3256-5615
Staguhn, Johannes0000-0002-8437-0433
Talia, Margherita0000-0003-4352-2063
Taniguchi, Yoshiaki0000-0003-2247-3741
Toft, Sune0000-0003-3631-7176
Treister, Ezequiel0000-0001-7568-6412
Yun, Min0000-0001-7095-7543
Additional Information:© 2019. The American Astronomical Society. Received 2019 September 3; revised 2019 October 25; accepted 2019 October 29; published 2019 December 11. The authors thank Shuowen Jin for helpful discussions in the preparation of this manuscript, as well as the anonymous reviewer who provided valuable comments and suggestions. This paper makes use of the following ALMA data: ADS/JAO.ALMA #2018.1.00037.A, ADS/JAO.ALMA #2018.1.00231.S, ADS/JAO.ALMA #2017.1.00373.S, and ADS/JAO.ALMA #2016.1.00279.S. ALMA is a partnership of ESO (representing its member states), NSF (USA), and NINS (Japan), together with NRC (Canada), MOST and ASIAA (Taiwan), and KASI (Republic of Korea), in cooperation with the Republic of Chile. The Joint ALMA Observatory is operated by ESO, AUI/NRAO, and NAOJ. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. C.M.C. thanks the National Science Foundation for support through grants AST-1714528 and AST-1814034, and additionally C.M.C. and J.A.Z. thank the University of Texas at Austin College of Natural Sciences for support. In addition, C.M.C. acknowledges support from the Research Corporation for Science Advancement from a 2019 Cottrell Scholar Award sponsored by IF/THEN, an initiative of Lyda Hill Philanthropies. K.I.C. acknowledges funding from the European Research Council through the award of the Consolidator Grant ID 681627-BUILDUP. S.L.F. thanks the National Science Foundation for support through grant AST-1518183 and NASA through grant 80NSSC18K0954. K.K. acknowledges support from the Knut and Alice Wallenberg Foundation. M.T. acknowledges the support from grant PRIN MIUR 2017. S.T. acknowledges support from the ERC Consolidator Grant funding scheme (project ConTExT, grant No. 648179). The Cosmic DAWN Center is funded by the Danish National Research Foundation under grant No. 140. E.T. acknowledges support from CONICYT-Chile grants Basal-CATA AFB-170002, FONDECYT Regular 1160999 and 1190818, and Anillo de Ciencia y Tecnologia ACT1720033.
Group:Astronomy Department
Funding AgencyGrant Number
University of Texas at AustinUNSPECIFIED
Cottrell Scholar of Research CorporationUNSPECIFIED
European Research Council (ERC)681627
Knut and Alice Wallenberg FoundationUNSPECIFIED
Ministero dell'Istruzione, dell'Università e della Ricerca (MIUR)UNSPECIFIED
European Research Council (ERC)648179
Danish National Research Foundation140
Comisión Nacional de Investigación Científica y Tecnológica (CONICYT)UNSPECIFIED
Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT)1160999
Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT)1190818
Anillo de Ciencia y TecnologiaACT1720033
Lyda Hill PhilanthropiesUNSPECIFIED
Subject Keywords:Starburst galaxies ; Infrared galaxies ; High-redshift galaxies ; Blank fields
Issue or Number:1
Classification Code:Unified Astronomy Thesaurus concepts: Starburst galaxies (1570); Infrared galaxies (790); High-redshift galaxies (734); Blank fields (163)
Record Number:CaltechAUTHORS:20191122-073158714
Persistent URL:
Official Citation:Caitlin M. Casey et al 2019 ApJ 887 55
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:100005
Deposited By: Tony Diaz
Deposited On:22 Nov 2019 15:50
Last Modified:16 Nov 2021 17:50

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