2020MNRAS.496..875R


Query : 2020MNRAS.496..875R

2020MNRAS.496..875R - Mon. Not. R. Astron. Soc., 496, 875-887 (2020/July-3)

The ALPINE-ALMA [C II] Survey: on the nature of an extremely obscured serendipitous galaxy.

ROMANO M., CASSATA P., MORSELLI L., LEMAUX B.C., BETHERMIN M., CAPAK P., FAISST A., LE FEVRE O., SCHAERER D., SILVERMAN J., YAN L., BARDELLI S., BOQUIEN M., CIMATTI A., DESSAUGES-ZAVADSKY M., ENIA A., FUDAMOTO Y., FUJIMOTO S., GINOLFI M., GRUPPIONI C., HATHI N.P., IBAR E., JONES G.C., KOEKEMOER A.M., LOIACONO F., MANCINI C., RIECHERS D.A., RODIGHIERO G., RODRIGUEZ-MUNOZ L., TALIA M., VALLINI L., VERGANI D., ZAMORANI G. and ZUCCA E.

Abstract (from CDS):

We report the serendipitous discovery of a dust-obscured galaxy observed as part of the Atacama Large Millimeter Array (ALMA) Large Program to INvestigate [C II] at Early times (ALPINE). While this galaxy is detected both in line and continuum emissions in ALMA Band 7, it is completely dark in the observed optical/near-infrared bands and only shows a significant detection in the UltraVISTA Ks band. We discuss the nature of the observed ALMA line, that is [C II] at z ∼ 4.6 or high-J CO transitions at z ∼ 2.2. In the first case, we find a [C II]/FIR luminosity ratio of log(L_[C II]/L FIR_) ∼-2.5, consistent with the average value for local star-forming galaxies (SFGs). In the second case instead, the source would lie at larger CO luminosities than those expected for local SFGs and high-z submillimetre galaxies. At both redshifts, we derive the star formation rate (SFR) from the ALMA continuum and the physical parameters of the galaxy, such as the stellar mass (M*), by fitting its spectral energy distribution. Exploiting the results of this work, we believe that our source is a 'main-sequence', dusty SFG at z = 4.6 (i.e. [C II] emitter) with log(SFR/M yr–1)∼1.4 and log(M*/M) ∼ 9.9. As a support to this scenario our galaxy, if at this redshift, lies in a massive protocluster recently discovered at z ∼ 4.57, at only ∼1 proper Mpc from its centre. This work underlines the crucial role of the ALPINE survey in making a census of this class of objects, in order to unveil their contribution to the global SFR density at the end of the Reionization epoch.

Abstract Copyright: © 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): galaxies: evolution - galaxies: high-redshift

Nomenclature: Figs 1+3: [RCM2020] Gal-A (Nos A-C).

Simbad objects: 11

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Number of rows : 11
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 NAME Extended Chandra Deep Field South reg 03 32 30.0 -27 48 20           ~ 757 0
2 ICRF J094857.3+002225 Sy1 09 48 57.32005819 +00 22 25.5596984   18.85 18.61 18.17   ~ 314 2
3 NAME COSMOS Field reg 10 00 28.60 +02 12 21.0           ~ 2912 0
4 [RCM2020] Gal-A G 10 01 13.820 +02 18 40.66           ~ 1 0
5 [RCM2020] Gal-C G 10 01 13.89547 +02 18 41.3140           ~ 1 0
6 [RCM2020] Gal-B G 10 01 13.92936 +02 18 42.6822           ~ 1 0
7 COSMOS2015 665626 EmG 10 01 14.230 +02 18 42.40           ~ 10 0
8 [LLC2018] PCl J1001+0220 ClG 10 01 24.80 +02 20 16.6           ~ 13 0
9 ICRF J105829.6+013358 Sy1 10 58 29.60520810 +01 33 58.8237454   18.74 18.28 16.68   ~ 767 2
10 NAME SMM J123652+621225 smm 12 36 51.976 +62 12 25.80           ~ 162 0
11 NAME HFLS 3 G 17 06 47.8 +58 46 23           ~ 135 0

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