2020MNRAS.495.3124H

Query : 2020MNRAS.495.3124H

2020MNRAS.495.3124H - Mon. Not. R. Astron. Soc., 495, 3124-3159 (2020/July-1)

Megaparsec-scale structure around the protocluster core SPT2349-56 at z = 4.3.

HILL R., CHAPMAN S., SCOTT D., APOSTOLOVSKI Y., ARAVENA M., BETHERMIN M., BRADFORD C.M., CANNING R.E.A., DE BREUCK C., DONG C., GONZALEZ A., GREVE T.R., HAYWARD C.C., HEZAVEH Y., LITKE K., MALKAN M., MARRONE D.P., PHADKE K., REUTER C., ROTERMUND K., SPILKER J., VIEIRA J.D. and WEISS A.

Abstract (from CDS):

We present an extensive ALMA spectroscopic follow-up programme of the z = 4.3 structure SPT2349-56, one of the most actively star-forming protocluster cores known, to identify additional members using their [C II] 158 µm and CO(4-3) lines. In addition to robustly detecting the 14 previously published galaxies in this structure, we identify a further 15 associated galaxies at z = 4.3, resolving 55 ±5 per cent of the 870 µm flux density at 0.5 arcsec resolution compared to 21 arcsec single-dish data. These galaxies are distributed into a central core containing 23 galaxies extending out to 300 kpc in diameter, and a northern extension, offset from the core by 400 kpc, containing three galaxies. We discovered three additional galaxies in a red Herschel-SPIRE source 1.5 Mpc from the main structure, suggesting the existence of many other sources at the same redshift as SPT2349-56 that are not yet detected in the limited coverage of our data. An analysis of the velocity distribution of the central galaxies indicates that this region may be virialized with a mass of (9±5) ×1012 M☉, while the two offset galaxy groups are about 30 and 60 per cent less massive and show significant velocity offsets from the central group. We calculate the [C II] and far-infrared number counts, and find evidence for a break in the [C II] luminosity function. We estimate the average SFR density within the region of SPT2349-56 containing single-dish emission (a proper diameter of 720 kpc), assuming spherical symmetry, to be roughly 4 ×10^4 M☉ yr–1 Mpc–3; this may be an order of magnitude greater than the most extreme examples seen in simulations.

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

Journal keyword(s): galaxies: evolution - galaxies: formation

Nomenclature: Fig. 1: [HCS2020] SPIREa (Nos SPIREa-SPIREe). Fig. 2, Tables 2-3: [HCS2020] CNN (Nos C1-C23), [HCS2020] NN (Nos N1-N3), [HCS2020] NLN (Nos NL1-NL3), [HCS2020] SPIREcN (Nos SPIREc1-SPIREc3).

Simbad objects: 44

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Number of rows : 44
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 [OID2018] DRC cluster ClG 00 42 23.6 -33 43 38           ~ 18 0
2 [SLG2012] Galaxy Cluster PCG 10 00 18.38 +02 14 58.0           ~ 17 0
3 NAME COSMOS AZtec 3 Cluster ClG 10 00 20.7 +02 35 20           ~ 14 0
4 NAME COSMOS Field reg 10 00 28.60 +02 12 21.0           ~ 2972 0
5 [CCC2015] PCL1002 ClG 10 00 31.20 +02 22 21.5           ~ 10 0
6 NAME MRC 1138-262 Protocluster PCG 11 40 48.4 -26 29 11           ~ 47 0
7 [CBI2009] z1.99 Cluster ClG 12 36 30.0 +62 13 00           ~ 7 0
8 NAME SMM J123652+621225 smm 12 36 51.976 +62 12 25.80           ~ 164 0
9 NAME SMM J123711+622212 AGN 12 37 11.92 +62 22 12.1   27.1786 25.185   24.4196 ~ 206 0
10 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 4800 2
11 NAME SSA22 Protocluster PCG 22 17 34.0 +00 17 01           ~ 137 0
12 SPT-CL J2349-5638 PCG 23 49.0 -56 38           ~ 23 0
13 [HCS2020] SPIREc2 G 23 49 22.78 -56 35 28.4           ~ 2 0
14 [HCS2020] SPIREc3 G 23 49 24.79 -56 35 12.8           ~ 2 0
15 [HCS2020] SPIREc1 G 23 49 24.95 -56 35 38.6           ~ 2 0
16 [HCS2020] NL1 smm 23 49 40.55 -56 38 06.0           ~ 2 0
17 [HCS2020] N3 G 23 49 40.75 -56 37 33.9           ~ 2 0
18 [HCS2020] C8 G 23 49 41.23 -56 38 24.4           ~ 5 0
19 [HCS2020] C4 G 23 49 41.42 -56 38 22.6           ~ 5 0
20 [HCS2020] C15 G 23 49 41.42 -56 38 14.9           ~ 2 0
21 [HCS2020] C18 G 23 49 41.67 -56 38 13.9           ~ 2 0
22 [HCS2020] C5 G 23 49 42.14 -56 38 25.8           ~ 5 0
23 [HCS2020] C9 G 23 49 42.22 -56 38 28.3           ~ 5 0
24 [HCS2020] C20 G 23 49 42.28 -56 38 24.0           ~ 2 0
25 [HCS2020] C11 G 23 49 42.38 -56 38 25.8           ~ 5 0
26 [HCS2020] C22 G 23 49 42.51 -56 38 27.4           ~ 2 0
27 [HCS2020] N1 G 23 49 42.53 -56 37 33.2           ~ 3 0
28 [HCS2020] C23 G 23 49 42.61 -56 38 26.7           ~ 2 0
29 [HCS2020] C1 G 23 49 42.67 -56 38 19.3           ~ 5 0
30 [HCS2020] C16 G 23 49 42.73 -56 38 25.8           ~ 2 0
31 [HCS2020] C13 G 23 49 42.74 -56 38 25.1           ~ 6 0
32 [HCS2020] C3 G 23 49 42.79 -56 38 24.0           ~ 6 0
33 [HCS2020] C6 G 23 49 42.84 -56 38 25.1           ~ 6 0
34 [HCS2020] C12 G 23 49 42.86 -56 38 23.9           ~ 2 0
35 [HCS2020] C7 G 23 49 42.96 -56 38 17.9           ~ 5 0
36 [HCS2020] C21 G 23 49 43.01 -56 38 27.0           ~ 2 0
37 [HCS2020] C2 G 23 49 43.22 -56 38 30.1           ~ 5 0
38 [HCS2020] C14 G 23 49 43.27 -56 38 22.9           ~ 6 0
39 [HCS2020] C17 G 23 49 43.39 -56 38 21.1           ~ 6 0
40 [HCS2020] NL2 smm 23 49 43.43 -56 37 35.4           ~ 2 0
41 [HCS2020] C10 G 23 49 43.46 -56 38 26.2           ~ 6 0
42 [HCS2020] N2 G 23 49 43.53 -56 37 16.7           ~ 3 0
43 [HCS2020] C19 G 23 49 43.86 -56 38 43.4           ~ 2 0
44 [HCS2020] NL3 smm 23 49 44.73 -56 38 40.0           ~ 2 0

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