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The ALPINE-ALMA [C II] survey. Circumgalactic medium pollution and gas mixing by tidal stripping in a merging system at z ∼ 4.57

Ginolfi, M. and Jones, G. C. and Béthermin, M. and Faisst, A. and Lemaux, B. C. and Schaerer, D. and Fudamoto, Y. and Oesch, P. and Dessauges-Zavadsky, M. and Fujimoto, S. and Carniani, S. and Le Fèvre, O. and Cassata, P. and Silverman, J. D. and Capak, P. and Yan, Lin and Bardelli, S. and Cucciati, O. and Gal, R. and Gruppioni, C. and Hathi, N. P. and Lubin, L. and Maiolino, R. and Morselli, L. and Pelliccia, D. and Talia, M. and Vergani, D. and Zamorani, G. (2020) The ALPINE-ALMA [C II] survey. Circumgalactic medium pollution and gas mixing by tidal stripping in a merging system at z ∼ 4.57. Astronomy and Astrophysics, 643 . Art. No. A7. ISSN 0004-6361.

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We present ALMA observations of a merging system at z ∼ 4.57, observed as a part of the ALMA Large Program to INvestigate [C II] at Early times (ALPINE) survey. Combining ALMA [C II] 158 μm and far-infrared continuum data with multi-wavelength ancillary data, we find that the system is composed of two massive (M⋆ ≳ 10¹⁰ M⊙) star-forming galaxies experiencing a major merger (stellar mass ratio r_(mass) ≳ 0.9) at close spatial (∼13 kpc; projected) and velocity (Δv <  300 km s⁻¹) separations, and two additional faint narrow [C II]-emitting satellites. The overall system belongs to a larger scale protocluster environment and is coincident to one of its overdensity peaks. Additionally, ALMA reveals the presence of [C II] emission arising from a circumgalactic gas structure, extending up to a diameter-scale of ∼30 kpc. Our morpho-spectral decomposition analysis shows that about 50% of the total flux resides between the individual galaxy components, in a metal-enriched gaseous envelope characterised by a disturbed morphology and complex kinematics. Similarly to observations of shock-excited [C II] emitted from tidal tails in local groups, our results can be interpreted as a possible signature of interstellar gas stripped by strong gravitational interactions, with a possible contribution from material ejected by galactic outflows and emission triggered by star formation in small faint satellites. Our findings suggest that mergers could be an efficient mechanism of gas mixing in the circumgalactic medium around high-z galaxies, and thus play a key role in the galaxy baryon cycle at early epochs.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Ginolfi, M.0000-0002-9122-1700
Jones, G. C.0000-0002-0267-9024
Béthermin, M.0000-0002-3915-2015
Faisst, A.0000-0002-9382-9832
Lemaux, B. C.0000-0002-1428-7036
Schaerer, D.0000-0001-7144-7182
Fudamoto, Y.0000-0001-7440-8832
Oesch, P.0000-0001-5851-6649
Dessauges-Zavadsky, M.0000-0003-0348-2917
Fujimoto, S.0000-0001-7201-5066
Le Fèvre, O.0000-0001-5891-2596
Cassata, P.0000-0002-6716-4400
Silverman, J. D.0000-0002-0000-6977
Capak, P.0000-0003-3578-6843
Yan, Lin0000-0003-1710-9339
Bardelli, S.0000-0002-8900-0298
Cucciati, O.0000-0002-9336-7551
Gal, R.0000-0001-8255-6560
Gruppioni, C.0000-0002-5836-4056
Hathi, N. P.0000-0001-6145-5090
Lubin, L.0000-0003-4249-5315
Maiolino, R.0000-0002-4985-3819
Morselli, L.0000-0003-0753-2571
Pelliccia, D.0000-0002-3007-0013
Talia, M.0000-0003-4352-2063
Vergani, D.0000-0003-0898-2216
Zamorani, G.0000-0002-2318-301X
Additional Information:© 2020 ESO. Article published by EDP Sciences. Received 28 April 2020; Accepted 20 July 2020; Published online 27 October 2020. The authors would like to thank the anonymous referee for her/his useful suggestions. 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. G.C.J.and R.M. acknowledge the ERC Advanced Grant 695671 “QUENCH” and support by the Science and Technology Facilities Council (STFC). C.G. and M.T. acknowledge the support from a grant PRIN MIUR 2017. S.C. acknowledges support from the ERC Advanced Grant INTERSTELLAR H2020/740120. The Cosmic Dawn Center is funded by the Danish National Research Foundation under grant No. 140. Some of the material presented in this paper is based upon work supported by the National Science Foundation under Grant No. 1908422. This program receives financial support from the French CNRS-INSU Programme National Cosmologie et Galaxies. This paper is dedicated to the memory of Olivier Le Fèvre, PI of the ALPINE survey.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
European Research Council (ERC)695671
Science and Technology Facilities Council (STFC)UNSPECIFIED
Ministero dell'Istruzione, dell'Università e della Ricerca (MIUR)UNSPECIFIED
European Research Council (ERC)740120
Danish National Research Foundation140
Centre National de la Recherche Scientifique (CNRS)UNSPECIFIED
Institut national des sciences de l'Univers (INSU)UNSPECIFIED
Subject Keywords:galaxies: evolution – galaxies: formation – galaxies: high-redshift – galaxies: ISM – galaxies: interactions – intergalactic medium
Record Number:CaltechAUTHORS:20201028-132727305
Persistent URL:
Official Citation:The ALPINE-ALMA [C II] survey - Circumgalactic medium pollution and gas mixing by tidal stripping in a merging system at z ∼ 4.57. M. Ginolfi, G. C. Jones, M. Béthermin, A. Faisst, B. C. Lemaux, D. Schaerer, Y. Fudamoto, P. Oesch, M. Dessauges-Zavadsky, S. Fujimoto, S. Carniani, O. Le Fèvre, P. Cassata, J. D. Silverman, P. Capak, Lin Yan, S. Bardelli, O. Cucciati, R. Gal, C. Gruppioni, N. P. Hathi, L. Lubin, R. Maiolino, L. Morselli, D. Pelliccia, M. Talia, D. Vergani and G. Zamorani. A&A, 643 (2020) A7; DOI:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:106333
Deposited By: Tony Diaz
Deposited On:29 Oct 2020 16:07
Last Modified:29 Oct 2020 16:49

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