2019MNRAS.486.4304S

Query : 2019MNRAS.486.4304S

2019MNRAS.486.4304S - Mon. Not. R. Astron. Soc., 486, 4304-4319 (2019/July-1)

Revealing dust-obscured star formation in CLJ1449+0856, a cluster at z = 2.

SMITH C.M.A., GEAR W.K., SMITH M.W.L., PAPAGEORGIOU A. and EALES S.A.

Abstract (from CDS):

We present SCUBA-2 450 and 850 µm data of the mature redshift 2 cluster CLJ1449. We combine this with archival Herschel data to explore the star-forming properties of CLJ1449. Using high-resolution Atacama Large Millimetre Array and Jansky Very Large Array data we identify potentially confused galaxies, and use the Bayesian inference tool XID+ to estimate fluxes for them. Using archival optical and near-infrared data with the energy-balance code CIGALE we calculate star formation rates and stellar masses for all our cluster members, and find that the star formation rate varies between 20 and 1600 M☉yr–1 over the entire 3 Mpc radial range. The central 0.5 Mpc region itself has a total star formation rate of 800 ± 200 M☉yr–1, which corresponds to a star formation rate density of (1.2 ± 0.3) x 104 M☉ yr–1 Mpc–3, which is approximately five orders of magnitude greater than expected field values. When comparing this cluster to those at lower redshifts we find that there is an increase in star formation rate per unit volume towards the centre of the cluster. This indicates that there is indeed a reversal in the star formation/density relation in CLJ1449. Based on the radial star formation rate density profile, we see evidence for an elevation in the star formation rate density, even out to radii of 3 Mpc. At these radii the elevation could be an order of magnitude greater than field values, but the exact number cannot be determined due to ambiguity in the redshift associations. If this is the case it would imply that this cluster is still accreting material which is possibly interacting and undergoing vigorous star formation.

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

Journal keyword(s): galaxies: clusters: individual: Cl J1449+0856 - galaxies: evolution - galaxies: high-redshift - galaxies: star formation

Nomenclature: Fig. 1, Table 2: [SGS2019] 850 NN (Nos 1-32).

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 - 2026 		#notes
1 NAME COSMOS Field reg 10 00 28.60 +02 12 21.0           ~ 3639 0
2 [SGS2019] 850 17 G 14 48 51.8 +08 57 28           ~ 1 0
3 [SGS2019] 850 3 smm 14 48 53.85 +08 53 54.0           ~ 1 0
4 [SGS2019] 850 4 G 14 48 56.9 +08 55 42           ~ 1 0
5 [SGS2019] 850 13 G 14 48 58.6 +08 57 10           ~ 1 0
6 ClG J1449+0856 ClG 14 49.0 +08 56           ~ 70 0
7 [SGS2019] 850 11 smm 14 49 03.26 +08 54 03.6           ~ 1 0
8 [SGS2019] 850 22 G 14 49 07.2 +08 59 20           ~ 1 0
9 [SGS2019] 850 7 smm 14 49 07.55 +08 53 55.3           ~ 1 0
10 [SGS2019] 850 6 smm 14 49 08.12 +08 57 27.0           ~ 1 0
11 [SGS2019] 850 16 G 14 49 09.4 +09 00 46           ~ 1 0
12 [SGS2019] 850 28 smm 14 49 09.95 +08 56 54.0           ~ 1 0
13 [SGS2019] 850 31 G 14 49 10.1 +08 57 41           ~ 1 0
14 [SGS2019] 850 27 smm 14 49 10.76 +08 53 18.0           ~ 1 0
15 [SGS2019] 850 8 G 14 49 12.2 +09 01 11           ~ 1 0
16 [SGS2019] 850 2 smm 14 49 13.02 +08 58 12.5           ~ 1 0
17 [SDG2016] 2 G 14 49 13.41 +08 56 34.7           ~ 5 0
18 [SCD2018] A4 G 14 49 13.56 +08 56 16.0           ~ 4 0
19 [SCD2018] A2 G 14 49 13.70 +08 56 22.2           ~ 6 0
20 [SDG2016] 13 G 14 49 14.05 +08 56 31.2           ~ 7 0
21 [SCD2018] A1 G 14 49 14.09 +08 56 25.3           ~ 6 0
22 [SGS2019] 850 1 smm 14 49 14.12 +08 56 15.7           ~ 1 0
23 [SDG2016] 1 G 14 49 14.14 +08 56 26.6           ~ 3 0
24 [SDG2016] 3 G 14 49 14.18 +08 56 22.2           ~ 6 0
25 [SDG2016] 6 G 14 49 14.38 +08 56 16.0           ~ 7 0
26 [SCD2018] HS7 G 14 49 14.45 +08 56 23.3           ~ 6 0
27 [SCD2018] HN7 G 14 49 14.47 +08 56 23.6           ~ 6 0
28 [SGS2019] 850 19 smm 14 49 14.75 +08 52 54.0           ~ 1 0
29 [SGS2019] 850 32 smm 14 49 16.43 +08 54 06.0           ~ 1 0
30 [SGS2019] 850 25 G 14 49 17.69662 +08 56 54.9055           ~ 2 0
31 [SGS2019] 850 9 G 14 49 18.2 +08 52 31           ~ 1 0
32 [SGS2019] 850 30 smm 14 49 19.13 +08 59 26.0           ~ 1 0
33 [SGS2019] 850 26 G 14 49 20.2 +08 56 41           ~ 1 0
34 [SGS2019] 850 10 smm 14 49 21.55 +08 52 42.1           ~ 1 0
35 [SGS2019] 850 23 smm 14 49 23.99 +08 56 18.0           ~ 1 0
36 [SGS2019] 850 5 G 14 49 25 +08 55.8           ~ 1 0
37 [SGS2019] 850 21 smm 14 49 25.34 +08 59 20.0           ~ 1 0
38 [SGS2019] 850 18 smm 14 49 25.66 +08 52 04.4           ~ 1 0
39 [SGS2019] 850 29 smm 14 49 27.77 +08 59 14.0           ~ 1 0
40 [SGS2019] 850 24 G 14 49 29.5 +08 52 24           ~ 1 0
41 [SGS2019] 850 14 G 14 49 29.8 +08 57 59           ~ 1 0
42 [SGS2019] 850 20 G 14 49 29.8 +08 59 28           ~ 1 0
43 [SGS2019] 850 15 smm 14 49 31.37 +08 58 04.7           ~ 1 0
44 [SGS2019] 850 12 smm 14 49 34.79 +08 57 01.0           ~ 1 0

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