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

Abstract : We report the detection of [C II] λ158 μm 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_{[C II]} [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.
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Contributor : Nathalie Pothier Connect in order to contact the contributor
Submitted on : Friday, May 13, 2022 - 10:10:38 AM
Last modification on : Sunday, May 15, 2022 - 3:03:24 AM

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G. C. Jones, M. Béthermin, Y. Fudamoto, M. Ginolfi, P. Capak, et al.. The ALPINE-ALMA [C II] survey: a triple merger at z ∼ 4.56. Monthly Notices of the Royal Astronomical Society: Letters, 2020, 491, pp.L18-L23. ⟨10.1093/mnrasl/slz154⟩. ⟨insu-03667138⟩



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