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ALPINE−ALMA [C II] Survey: on the nature of an extremely obscured serendipitous galaxy

Romano, M. and Cassata, P. and Morselli, L. and Lemaux, B. C. and Béthermin, M. and Capak, P. and Faisst, A. and Le Fèvre, O. and Schaerer, D. and Silverman, J. and Yan, L. and Bardelli, S. and Boquien, M. and Cimatti, A. and Dessauges-Zavadsky, M. and Enia, A. and Fudamoto, Y. and Fujimoto, S. and Ginolfi, M. and Gruppioni, C. and Hathi, N. P. and Ibar, E. and Jones, G. C. and Koekemoer, A. M. and Loiacono, F. and Mancini, C. and Riechers, D. A. and Rodighiero, G. and Rodríguez-Muñoz, L. and Talia, M. and Vallini, L. and Vergani, D. and Zamorani, G. and Zucca, E. (2020) ALPINE−ALMA [C II] Survey: on the nature of an extremely obscured serendipitous galaxy. Monthly Notices of the Royal Astronomical Society, 496 (1). pp. 875-887. ISSN 0035-8711. doi:10.1093/mnras/staa1546.

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We report the serendipitous discovery of a dust-obscured galaxy observed as part of the Atacama Large Millimeter Array (ALMA) Large Program to INvestigate [C II] at Early times (ALPINE). While this galaxy is detected both in line and continuum emissions in ALMA Band 7, it is completely dark in the observed optical/near-infrared bands and only shows a significant detection in the UltraVISTA K_s band. We discuss the nature of the observed ALMA line, that is [C II] at z ∼ 4.6 or high-J CO transitions at z ∼ 2.2. In the first case, we find a [C II]/FIR luminosity ratio of log(L_([CII])/L_(FIR))∼−2.5⁠, consistent with the average value for local star-forming galaxies (SFGs). In the second case instead, the source would lie at larger CO luminosities than those expected for local SFGs and high-z submillimetre galaxies. At both redshifts, we derive the star formation rate (SFR) from the ALMA continuum and the physical parameters of the galaxy, such as the stellar mass (M*), by fitting its spectral energy distribution. Exploiting the results of this work, we believe that our source is a ‘main-sequence’, dusty SFG at z = 4.6 (i.e. [C II] emitter) with log(SFR/M_⊙ yr⁻¹) ∼ 1.4 and log(M*/M_⊙) ∼ 9.9. As a support to this scenario our galaxy, if at this redshift, lies in a massive protocluster recently discovered at z ∼ 4.57, at only ∼1 proper Mpc from its centre. This work underlines the crucial role of the ALPINE survey in making a census of this class of objects, in order to unveil their contribution to the global SFR density at the end of the Reionization epoch.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Romano, M.0000-0002-9948-3916
Cassata, P.0000-0002-6716-4400
Morselli, L.0000-0003-0753-2571
Lemaux, B. C.0000-0002-1428-7036
Béthermin, M.0000-0002-3915-2015
Capak, P.0000-0003-3578-6843
Faisst, A.0000-0002-9382-9832
Le Fèvre, O.0000-0001-5891-2596
Schaerer, D.0000-0001-7144-7182
Silverman, J.0000-0002-0000-6977
Yan, L.0000-0003-1710-9339
Bardelli, S.0000-0002-8900-0298
Boquien, M.0000-0003-0946-6176
Dessauges-Zavadsky, M.0000-0003-0348-2917
Enia, A.0000-0002-0200-2857
Fudamoto, Y.0000-0001-7440-8832
Fujimoto, S.0000-0001-7201-5066
Ginolfi, M.0000-0002-8231-821X
Gruppioni, C.0000-0002-5836-4056
Hathi, N. P.0000-0001-6145-5090
Jones, G. C.0000-0002-0267-9024
Koekemoer, A. M.0000-0002-6610-2048
Loiacono, F.0000-0002-8858-6784
Mancini, C.0000-0002-4297-0561
Rodighiero, G.0000-0002-9415-2296
Rodríguez-Muñoz, L.0000-0002-0192-5131
Talia, M.0000-0003-4352-2063
Vallini, L.0000-0002-3258-3672
Zamorani, G.0000-0002-2318-301X
Zucca, E.0000-0002-5845-8132
Additional Information:© 2020 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model ( Accepted 2020 May 27. Received 2020 May 26; in original form 2020 January 31. Published: 04 June 2020. This paper is based on data obtained with the ALMA observatory, under the Large Program 2017.1.00428.L. 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, Associated Universities, Inc. (AUI)/National Radio Astronomy Observatory (NRAO) and NAOJ. Based on data products from observations made with ESO Telescopes at the La Silla Paranal Observatory under ESO programme ID 179.A-2005 and on data products produced by CALET and the Cambridge Astronomy Survey Unit on behalf of the UltraVISTA consortium. This work has made use of the Rainbow Cosmological Surveys Database, which is operated by the Centro de Astrobiología (CAB/INTA), partnered with the University of California Observatories at Santa Cruz (UCO/Lick,UCSC). We thank D. Liu and collaborators for providing us individual values of CO and FIR luminosities estimated in their work. SB, AC, CG, FL, FP, GR, and MT acknowledge the support from grant PRIN MIUR 2017. LV acknowledges funding from the European Union’s Horizon 2020 research and innovation program under the Marie Sklodowska-Curie grant agreement no. 746119. DR acknowledges support from the National Science Foundation under grant numbers AST-1614213 and AST-1910107 and from the Alexander von Humboldt Foundation through a Humboldt Research Fellowship for Experienced Researchers. GCJ acknowledges ERC Advanced grant 695671 ‘QUENCH’ and support by the Science and Technology Facilities Council (STFC). SF is supported by the Cosmic Dawn Center of Excellence founded by the Danish National Research Foundation under the grant no. 140. EI acknowledges partial support from FONDECYT through grant number  1171710. JDS was supported by JSPS KAKENHI grant number JP18H04346, and the World Premier International Research Center Initiative (WPI Initiative), MEXT, Japan.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Ministero dell'Istruzione, dell'Università e della Ricerca (MIUR)UNSPECIFIED
Marie Curie Fellowship746119
Alexander von Humboldt FoundationUNSPECIFIED
European Research Council (ERC)695671
Science and Technology Facilities Council (STFC)UNSPECIFIED
Danish National Research Foundation140
Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT)1171710
Japan Society for the Promotion of Science (JSPS)JP18H04346
Ministry of Education, Culture, Sports, Science and Technology (MEXT)UNSPECIFIED
Subject Keywords:galaxies: evolution – galaxies: high-redshift
Issue or Number:1
Record Number:CaltechAUTHORS:20200903-125326613
Persistent URL:
Official Citation:M Romano, P Cassata, L Morselli, B C Lemaux, M Béthermin, P Capak, A Faisst, O Le Fèvre, D Schaerer, J Silverman, L Yan, S Bardelli, M Boquien, A Cimatti, M Dessauges-Zavadsky, A Enia, Y Fudamoto, S Fujimoto, M Ginolfi, C Gruppioni, N P Hathi, E Ibar, G C Jones, A M Koekemoer, F Loiacono, C Mancini, D A Riechers, G Rodighiero, L Rodríguez-Muñoz, M Talia, L Vallini, D Vergani, G Zamorani, E Zucca, The ALPINE−ALMA [C II] Survey: on the nature of an extremely obscured serendipitous galaxy, Monthly Notices of the Royal Astronomical Society, Volume 496, Issue 1, July 2020, Pages 875–887,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:105243
Deposited By: Tony Diaz
Deposited On:08 Sep 2020 17:20
Last Modified:16 Nov 2021 18:41

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