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The ALPINE-ALMA [CII] Survey: A Triple Merger at z ~ 4.56

Jones, G. C. and Bethermin, M. and Fudamoto, Y. and Ginolfi, M. and Capak, P. and Cassata, P. and Faisst, A. and Le Fevre, O. and Schaerer, D. and Silverman, J. and Yan, L. 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. (2019) The ALPINE-ALMA [CII] Survey: A Triple Merger at z ~ 4.56. . (Unpublished) https://resolver.caltech.edu/CaltechAUTHORS:20191002-135305171

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Abstract

We report the detection of [CII] λ158um emission from a system of three closely-separated sources in the COSMOS field at z~4.56, as part of the ALMA Large Program to INvestigate CII at Early times (ALPINE). The two dominant sources are closely associated, both spatially (1.6"~11kpc) and in velocity (~100km s^(-1)), while the third source is slightly more distant (2.8"~18kpc, ~300km s^(-1)). The second strongest source features a slight velocity gradient, while no significant velocity gradient is seen in the other two sources. Using the observed [CII] luminosities, we derive a total log_(10)(SFR_[CII]/[M⊙/year^(-1)]) = 2.8±0.2, which may be split into contributions of 59%, 31%, and 10% from the central, east, and west sources, respectively. Comparison of these [CII] 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 on-going major merger and an upcoming minor merger, which is expected to end up in a single massive galaxy by z~2.5.


Item Type:Report or Paper (Discussion Paper)
Related URLs:
URLURL TypeDescription
http://arxiv.org/abs/1908.07777arXivDiscussion Paper
ORCID:
AuthorORCID
Jones, G. C.0000-0002-0267-9024
Capak, P.0000-0003-3578-6843
Faisst, A.0000-0002-9382-9832
Yan, L.0000-0003-1710-9339
Additional Information:This paper 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 and 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. G.C.J. and R.M. acknowledge ERC Advanced Grant 695671 “QUENCH" and support by the Science and Technology Facilities Council (STFC). D.R. 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. A.C., F.P. and M.T. acknowledge the grant MIUR PRIN 2017. L.V. acknowledges funding from the European Union’s Horizon 2020 research and innovation program under the Marie Sklodowska-Curie Grant agreement No. 746119. E.I. acknowledges partial support from FONDECYT through grant No 1171710.
Group:Infrared Processing and Analysis Center (IPAC)
Funders:
Funding AgencyGrant Number
Centre National de la Recherche Scientifique (CNRS)UNSPECIFIED
European Research Council (ERC)695671
Science and Technology Facilities Council (STFC)UNSPECIFIED
NSFAST-1614213
Alexander von Humboldt FoundationUNSPECIFIED
Istituto Nazionale di Fisica Nucleare (INFN)PRIN 2017
Marie Curie Fellowship746119
Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT)1171710
Subject Keywords:galaxies: evolution - galaxies: interaction - galaxies: high-redshift
Record Number:CaltechAUTHORS:20191002-135305171
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20191002-135305171
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:99023
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:02 Oct 2019 21:29
Last Modified:03 Oct 2019 21:46

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