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Jones, G C; Béthermin, M; Fudamoto, Y; Ginolfi, M; Capak, P; Cassata, P; Faisst, A; Le Fèvre, O; Schaerer, D; Silverman, J D; Yan, Lin; 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
Monthly Notices of the Royal Astronomical Society Letters, 01/2020, Letnik: 491, Številka: 1Journal Article
ABSTRACT We report the detection of C ii λ158 $\mu$m 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$_{10}(\rm SFR_{C\,{\small II}}\, M_{\odot }\, yr^{-1})=2.8\pm 0.2$, 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.
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