2022MNRAS.512.4352H

Query : 2022MNRAS.512.4352H

2022MNRAS.512.4352H - Mon. Not. R. Astron. Soc., 512, 4352-4377 (2022/May-3)

Rapid build-up of the stellar content in the protocluster core SPT2349-56 at z = 4.3.

HILL R., CHAPMAN S., PHADKE K.A., ARAVENA M., ARCHIPLEY M., ASHBY M.L.N., BETHERMIN M., CANNING R.E.A., GONZALEZ A., GREVE T.R., GURURAJAN G., HAYWARD C.C., HEZAVEH Y., JARUGULA S., MacINTYRE D., MARRONE D.P., MILLER T., RENNEHAN D., REUTER C., ROTERMUND K.M., SCOTT D., SPILKER J., VIEIRA J.D., WANG G. and WEISS A.

Abstract (from CDS):

The protocluster SPT2349-56 at z = 4.3 contains one of the most actively star-forming cores known, yet constraints on the total stellar mass of this system are highly uncertain. We have therefore carried out deep optical and infrared observations of this system, probing rest-frame ultraviolet to infrared wavelengths. Using the positions of the spectroscopically confirmed protocluster members, we identify counterparts and perform detailed source deblending, allowing us to fit spectral energy distributions in order to estimate stellar masses. We show that the galaxies in SPT2349-56 have stellar masses proportional to their high star formation rates, consistent with other protocluster galaxies and field submillimetre galaxies (SMGs) around redshift 4. The galaxies in SPT2349-56 have on average lower molecular gas-to-stellar mass fractions and depletion time-scales than field SMGs, although with considerable scatter. We construct the stellar-mass function for SPT2349-56 and compare it to the stellar-mass function of z = 1 galaxy clusters, finding consistent shapes between the two. We measure rest-frame galaxy ultraviolet half-light radii from our HST-F160W imaging, finding that on average the galaxies in our sample are similar in size to typical star-forming galaxies at these redshifts. However, the brightest HST-detected galaxy in our sample, found near the luminosity-weighted centre of the protocluster core, remains unresolved at this wavelength. Hydrodynamical simulations predict that the core galaxies will quickly merge into a brightest cluster galaxy, thus our observations provide a direct view of the early formation mechanisms of this class of object.

Abstract Copyright: © 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society

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

Simbad objects: 46

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Number of rows : 46
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 ZwCl 0024+1652 ClG 00 26 35.6 +17 09 32     18.35     ~ 648 1
2 NAME GOODS Southern Field reg 03 32 28.0 -27 48 30           ~ 1623 1
3 NAME Extended Chandra Deep Field South reg 03 32 30.0 -27 48 20           ~ 862 0
4 ACO S 373 ClG 03 38 29.4 -35 27 08           ~ 2029 0
5 ClG J0717+3745 ClG 07 17 36.50 +37 45 23.0           ~ 511 0
6 ACO 697 ClG 08 42 57.6 +36 21 45           ~ 277 0
7 NAME COSMOS Field reg 10 00 28.60 +02 12 21.0           ~ 3639 0
8 ACO 963 ClG 10 17 03.4 +39 02 56           ~ 414 0
9 ACO 1763 ClG 13 35 20.1 +41 00 04           ~ 335 0
10 ClG J1411-1148 ClG 14 11 03.9 -11 48 22           ~ 32 0
11 ACO 2192 ClG 16 27 24.4 +42 40 43           ~ 65 0
12 ACO 2219 ClG 16 40 22.1 +46 42 20           ~ 381 0
13 ClG J2215-1738 ClG 22 15 58.5 -17 38 03           ~ 106 0
14 SPT-CL J2349-5638 PCG 23 49.0 -56 38           ~ 47 0
15 [HCS2020] SPIREc2 G 23 49 22.78 -56 35 28.4           ~ 2 0
16 [HCS2020] SPIREc3 G 23 49 24.79 -56 35 12.8           ~ 2 0
17 [HCS2020] SPIREc1 G 23 49 24.95 -56 35 38.6           ~ 2 0
18 [HCS2020] NL1 smm 23 49 40.55 -56 38 06.0           ~ 3 0
19 [HCS2020] N3 G 23 49 40.75 -56 37 33.9           ~ 3 0
20 [HCS2020] C8 G 23 49 41.23 -56 38 24.4           ~ 11 0
21 [HCS2020] C4 G 23 49 41.42 -56 38 22.6           ~ 11 0
22 [HCS2020] C15 G 23 49 41.42 -56 38 14.9           ~ 4 0
23 [HCS2020] C18 G 23 49 41.67 -56 38 13.9           ~ 3 0
24 [HCS2020] C5 G 23 49 42.14 -56 38 25.8           ~ 9 0
25 [HCS2020] C9 G 23 49 42.22 -56 38 28.3           ~ 9 0
26 [HCS2020] C20 G 23 49 42.28 -56 38 24.0           ~ 5 0
27 [HCS2020] C11 G 23 49 42.38 -56 38 25.8           ~ 9 0
28 [HCS2020] C22 G 23 49 42.51 -56 38 27.4           ~ 5 0
29 [HCS2020] N1 G 23 49 42.53 -56 37 33.2           ~ 8 0
30 [HCS2020] C23 G 23 49 42.61 -56 38 26.7           ~ 6 0
31 [HCS2020] C1 G 23 49 42.67 -56 38 19.3           ~ 12 0
32 [HCS2020] C16 G 23 49 42.73 -56 38 25.8           ~ 6 0
33 [HCS2020] C13 G 23 49 42.74 -56 38 25.1           ~ 12 0
34 [HCS2020] C3 G 23 49 42.79 -56 38 24.0           ~ 13 0
35 [HCS2020] C6 G 23 49 42.84 -56 38 25.1           ~ 13 0
36 [HCS2020] C12 G 23 49 42.86 -56 38 23.9           ~ 7 0
37 [HCS2020] C7 G 23 49 42.96 -56 38 17.9           ~ 9 0
38 [HCS2020] C21 G 23 49 43.01 -56 38 27.0           ~ 5 0
39 [HCS2020] C2 G 23 49 43.22 -56 38 30.1           ~ 10 0
40 [HCS2020] C14 G 23 49 43.27 -56 38 22.9           ~ 9 0
41 [HCS2020] C17 G 23 49 43.39 -56 38 21.1           ~ 8 0
42 [HCS2020] NL2 smm 23 49 43.43 -56 37 35.4           ~ 3 0
43 [HCS2020] C10 G 23 49 43.46 -56 38 26.2           ~ 9 0
44 [HCS2020] N2 G 23 49 43.53 -56 37 16.7           ~ 5 0
45 [HCS2020] C19 G 23 49 43.86 -56 38 43.4           ~ 4 0
46 [HCS2020] NL3 smm 23 49 44.73 -56 38 40.0           ~ 2 0

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