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

Autor: G. C. Jones, Dominik Riechers, Y. Fudamoto, Margherita Talia, Andreas L. Faisst, Miroslava Dessauges-Zavadsky, John D. Silverman, Peter Capak, G. Rodighiero, Mauro Giavalisco, S. Bardelli, Lin Yan, G. Zamorani, Livia Vallini, E. Zucca, Matthieu Béthermin, O. Le Fevre, Paolo Cassata, Brian C. Lemaux, Carlotta Gruppioni, D. Vergani, Y. Khusanova, Michele Ginolfi, Roberto Maiolino, Francesca Pozzi, F. Loiacono, Anton M. Koekemoer, Daniel Schaerer, Edo Ibar, Médéric Boquien, Andrea Cimatti, Pascal Oesch
Přispěvatelé: Jones G.C., Bethermin M., Fudamoto Y., Ginolfi M., Capak P., Cassata P., Faisst A., Le Fevre O., Schaerer D., Silverman J.D., Yan L., Bardelli S., Boquien M., Cimatti A., Dessauges-Zavadsky M., Giavalisco M., Gruppioni C., Ibar E., Khusanova Y., Koekemoer A.M., Lemaux B.C., Loiacono F., Maiolino R., Oesch P.A., Pozzi F., Riechers D., Rodighiero G., Talia M., Vallini L., Vergani D., Zamorani G., Zucca E., Laboratoire d'Astrophysique de Marseille (LAM), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), Jones, Gareth [0000-0002-0267-9024], Maiolino, Roberto [0000-0002-4985-3819], Apollo - University of Cambridge Repository, Jones, G. C., Bethermin, M., Fudamoto, Y., Ginolfi, M., Capak, P., Cassata, P., Faisst, A., Le Fevre, O., Schaerer, D., Silverman, J. D., Yan, L., Bardelli, S., Boquien, M., Cimatti, A., Dessauges-Zavadsky, M., Giavalisco, M., Gruppioni, C., Ibar, E., Khusanova, Y., Koekemoer, A. M., Lemaux, B. C., Loiacono, F., Maiolino, R., Oesch, P. A., Pozzi, F., Riechers, D., Rodighiero, G., Talia, M., Vallini, L., Vergani, D., Zamorani, G., Zucca, E.
Jazyk: angličtina
Rok vydání: 2020
Předmět:
Zdroj: Monthly Notices of the Royal Astronomical Society: Letters
Monthly Notices of the Royal Astronomical Society: Letters, 2020, 491, pp.L18-L23. ⟨10.1093/mnrasl/slz154⟩
Monthly Notices of the Royal Astronomical Society: Letters, 491(1), L18-L23
ISSN: 1745-3933
DOI: 10.1093/mnrasl/slz154⟩
Popis: We report the detection of [CII]158um 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), while the third source is slightly more distant (2.8"~18kpc, ~300km/s). 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(SFR_[CII]/[Msol/year])=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.
5 pages, 4 figures, submitted to MNRASL
Databáze: OpenAIRE
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