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EnglishWe 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 log10(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.
| Titolo: | The ALPINE-ALMA [C II] survey: A triple merger at z ∼ 4.56 | |
| Autore/i: | 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. | |
| Autore/i Unibo: | ||
| Anno: | 2020 | |
| Rivista: | ||
| Digital Object Identifier (DOI): | http://dx.doi.org/10.1093/mnrasl/slz154 | |
| 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 log10(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. | |
| Data stato definitivo: | 2020-07-06T09:31:35Z | |
| Appare nelle tipologie: | 1.01 Articolo in rivista |
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http://hdl.handle.net/11585/764354
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