2020MNRAS.491L..18J

Query : 2020MNRAS.491L..18J

2020MNRAS.491L..18J - Mon. Not. R. Astron. Soc., 491, L18 (2020/January-1)

The ALPINE-ALMA [C II] Survey: a triple merger at z 4.56.

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. and ZUCCA E.

Abstract (from CDS):

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.

Abstract Copyright: © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): galaxies: evolution - galaxies: high-redshift - galaxies: interactions - galaxies: kinematics and dynamics

Nomenclature: Fig. 1, Table 1: [JBF2020] DEIMOS COSMOS 818760 A (Nos C, E, W).

CDS comments: DEIMOS COSMOS 818760 is COSMOS2015 818760 in SIMBAD. J0158+0133 (calibrator) is a probable misprint for J1058+0133.

Simbad objects: 9

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Number of rows : 9
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NAME Extended Chandra Deep Field South reg 03 32 30.0 -27 48 20           ~ 862 0
2 QSO J0948+0022 Bla 09 48 57.32005819 +00 22 25.5596984   18.85 18.61 18.17   ~ 350 2
3 NAME COSMOS Field reg 10 00 28.60 +02 12 21.0           ~ 3639 0
4 NAME Taralay Protocluster PCG 10 01 24.80 +02 20 16.6           ~ 26 0
5 [JBF2020] DEIMOS COSMOS 818760 W G 10 01 54.683 +02 32 31.44           ~ 2 0
6 COSMOS2015 818760 EmG 10 01 54.86 +02 32 31.5     27.205 26.26 24.27 ~ 31 0
7 [JBF2020] DEIMOS COSMOS 818760 C G 10 01 54.865 +02 32 31.53           ~ 1 0
8 COSMOS2015 818306 G 10 01 54.978 +02 32 31.50           ~ 2 0
9 4C 01.28 BLL 10 58 29.60520810 +01 33 58.8237454   18.74 18.28 16.68   ~ 828 2

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