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ALPINE-ALMA [C II] survey: a triple merger at z ∼ 4.56

Jones, G. C. and Béthermin, M. and Fudamoto, Y. and Ginolfi, M. and Capak, P. and Cassata, P. and Faisst, A. and Le Fèvre, O. and Schaerer, D. and Silverman, J. D. and Yan, Lin and Bardelli, S. and Boquien, M. and Cimatti, A. and Dessauges-Zavadsky, M. and Giavalisco, M. and Gruppioni, C. and Ibar, E. and Khusanova, Y. and Koekemoer, A. M. and Lemaux, B. C. and Loiacono, F. and Maiolino, R. and Oesch, P. A. and Pozzi, F. and Riechers, D. and Rodighiero, G. and Talia, M. and Vallini, L. and Vergani, D. and Zamorani, G. and Zucca, E. (2020) ALPINE-ALMA [C II] survey: a triple merger at z ∼ 4.56. Monthly Notices of the Royal Astronomical Society: Letters, 491 (1). L18-L23. ISSN 1745-3925.

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We report the detection of [C II] λ158 μμm emission from a system of three closely separated sources in the Cosmic Evolution Survey (COSMOS) field at z ∼ 4.56 , as part of the Atacama Large Millimeter/submillimeter Array (ALMA) Large Program to INvestigate C II at Early times (ALPINE). The two most luminous sources are closely associated, both spatially (1.6 arcsec ∼ 11 kpc) and in velocity (∼100 km s⁻¹), while the third source is slightly more distant (2.8 arcsec ∼ 18 kpc, ∼300 km s⁻¹). The second most luminous source features a slight velocity gradient, while no significant velocity gradient is seen in the other two sources. Using the observed [C II] luminosities, we derive a total log_(10)(SFR_([CII])[M⊙yr⁻¹])=2.8±0.2⁠, which may be split into contributions of 59, 31, and 10 per cent from the central, east, and west sources, respectively. Comparison of these [C II] detections to recent zoom-in cosmological simulations suggests an ongoing major merger. We are thus witnessing a system in a major phase of mass build-up by merging, including an ongoing major merger and an upcoming minor merger, which is expected to end up in a single massive galaxy by z ∼ 2.5.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Jones, G. C.0000-0002-0267-9024
Fudamoto, Y.0000-0001-7440-8832
Ginolfi, M.0000-0002-8231-821X
Capak, P.0000-0003-3578-6843
Faisst, A.0000-0002-9382-9832
Yan, Lin0000-0003-1710-9339
Gruppioni, C.0000-0002-5836-4056
Koekemoer, A. M.0000-0002-6610-2048
Lemaux, B. C.0000-0002-1428-7036
Loiacono, F.0000-0002-8858-6784
Talia, M.0000-0003-4352-2063
Vallini, L.0000-0002-3258-3672
Additional Information:© 2019 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 2019 October 3. Received 2019 October 2; in original form 2019 August 21. Published: 07 October 2019. This Letter is based on data obtained with the ALMA Observatory, under 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, AUI/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, on data products produced by TERAPIX, and the Cambridge Astronomy Survey Unit on behalf of the UltraVISTA consortium. This program is supported by the national program Cosmology and Galaxies from the CNRS in France. GCJ and RM acknowledge ERC Advanced Grant 695671 ‘QUENCH’ and support by the Science and Technology Facilities Council (STFC). DR acknowledges support from the National Science Foundation under grant number AST-1614213 and from the Alexander von Humboldt Foundation through a Humboldt Research Fellowship for Experienced Researchers. AC, FP, and MT acknowledge the grant MIUR PRIN2017. LV acknowledges funding from the European Union’s Horizon 2020 research and innovation program under the Marie Sklodowska-Curie grant agreement no. 746119. EI acknowledges partial support from FONDECYT through grant N° 1171710.
Group:Infrared Processing and Analysis Center (IPAC), COSMOS
Funding AgencyGrant Number
Centre National de la Recherche Scientifique (CNRS)UNSPECIFIED
European Research Council (ERC)695671
Science and Technology Facilities Council (STFC)UNSPECIFIED
Alexander von Humboldt FoundationUNSPECIFIED
Ministero dell'Istruzione, dell'Universita e della Ricerca (MIUR)PRIN2017
Marie Curie Fellowship746119
Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT)1171710
Subject Keywords:galaxies: evolution – galaxies: high-redshift – galaxies: interactions – galaxies: kinematics and dynamics
Issue or Number:1
Record Number:CaltechAUTHORS:20200423-104937638
Persistent URL:
Official Citation:G C Jones, M Béthermin, Y Fudamoto, M Ginolfi, P Capak, P Cassata, A Faisst, O Le Fèvre, D Schaerer, J D Silverman, Lin Yan, S Bardelli, M Boquien, A Cimatti, M Dessauges-Zavadsky, M Giavalisco, C Gruppioni, E Ibar, Y Khusanova, A M Koekemoer, B C Lemaux, F Loiacono, R Maiolino, P A Oesch, F Pozzi, D Riechers, G Rodighiero, M Talia, L Vallini, D Vergani, G Zamorani, E Zucca, The ALPINE-ALMA [C II] survey: a triple merger at z ∼ 4.56, Monthly Notices of the Royal Astronomical Society: Letters, Volume 491, Issue 1, January 2020, Pages L18–L23,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:102748
Deposited By: Tony Diaz
Deposited On:23 Apr 2020 19:22
Last Modified:23 Apr 2020 19:22

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