2014ApJ...789...18K

Query : 2014ApJ...789...18K

2014ApJ...789...18K - Astrophys. J., 789, 18 (2014/July-1)

The environmental impacts on the star formation main sequence: an Hα study of the newly discovered rich cluster at z = 1.52.

KOYAMA Y., KODAMA T., TADAKI K.-I., HAYASHI M., TANAKA I. and SHIMAKAWA R.

Abstract (from CDS):

We report the discovery of a strong over-density of galaxies in the field of a radio galaxy at z = 1.52 (4C 65.22) based on our broadband and narrow-band (Hα) photometry with the Subaru Telescope. We find that Hα emitters are located in the outskirts of the density peak (cluster core) dominated by passive red-sequence galaxies. This resembles the situation in lower-redshift clusters, suggesting that the newly discovered structure is a well-evolved rich galaxy cluster at z = 1.5. Our data suggest that the color-density and stellar mass-density relations are already in place at z ∼ 1.5, mostly driven by the passive red massive galaxies residing within rc ≲ 200 kpc from the cluster core. These environmental trends almost disappear when we consider only star-forming (SF) galaxies. We do not find SFR-density or SSFR-density relations amongst SF galaxies, and the location of the SF main sequence does not significantly change with environment. Nevertheless, we find a tentative hint that star-bursting galaxies (up-scattered objects from the main sequence) are preferentially located in a small group at ∼1 Mpc away from the main body of the cluster. We also argue that the scatter of the SF main sequence could be dependent on the distance to the nearest neighboring galaxy.

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Journal keyword(s): galaxies: active - galaxies: evolution - galaxies: clusters: general

Nomenclature: Table 2 : [KKT2014] NNNN N=44 among (Nos 12-2126). Text: [KKT2014] 4C 65.22 cluster N=1.

Simbad objects: 49

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Number of rows : 49
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 Chandra Deep Field-South reg 03 32 28.0 -27 48 30           ~ 2282 1
2 PKS J1140-2628 rG 11 40 48.35884 -26 29 08.6316     22.00     ~ 325 1
3 [KKT2014] 1263 EmG 17 46 33.42 +65 33 03.3           ~ 2 0
4 [KKT2014] 858 EmG 17 46 33.60 +65 32 06.1           ~ 1 0
5 [KKT2014] 1521 EmG 17 46 34.69 +65 33 44.1           ~ 2 0
6 [KKT2014] 14 EmG 17 46 40.91 +65 34 25.0           ~ 1 0
7 [KKT2014] 1002 EmG 17 46 43.25 +65 32 27.4           ~ 2 0
8 [KKT2014] 1555 EmG 17 46 43.56 +65 33 50.7           ~ 1 0
9 [KKT2014] 1554 EmG 17 46 43.74 +65 33 49.4           ~ 2 0
10 [KKT2014] 1567 EmG 17 46 44.09 +65 33 51.5           ~ 2 0
11 [KKT2014] 1576 EmG 17 46 45.86 +65 33 52.2           ~ 1 0
12 [KKT2014] 2126 EmG 17 46 46.59 +65 30 34.6           ~ 1 0
13 [KKT2014] 870 EmG 17 46 47.82 +65 32 08.2           ~ 1 0
14 [KKT2014] 576 EmG 17 46 49.40 +65 31 23.4           ~ 2 0
15 [KKT2014] 1400 EmG 17 46 50.65 +65 33 22.3           ~ 2 0
16 [KKT2014] 1456 EmG 17 46 53.46 +65 33 33.7           ~ 2 0
17 [KKT2014] 1509 EmG 17 46 56.69 +65 33 42.9           ~ 2 0
18 [KKT2014] 357 EmG 17 47 04.18 +65 30 57.9           ~ 2 0
19 [KKT2014] 13 EmG 17 47 04.24 +65 34 25.8           ~ 1 0
20 [KKT2014] 1887 EmG 17 47 04.25 +65 34 24.9           ~ 2 0
21 [KKT2014] 12 EmG 17 47 04.39 +65 34 25.8           ~ 1 0
22 [KKT2014] 1085 EmG 17 47 05.75 +65 32 40.3           ~ 2 0
23 [KKT2014] 1187 EmG 17 47 06.82 +65 32 54.4           ~ 1 0
24 [KKT2014] 1304 EmG 17 47 07.70 +65 33 10.4           ~ 2 0
25 [KKT2014] 1314 EmG 17 47 08.22 +65 33 12.9           ~ 1 0
26 [KKT2014] 409 EmG 17 47 08.82 +65 31 04.6           ~ 2 0
27 [KKT2014] 930 EmG 17 47 10.51 +65 32 15.4           ~ 2 0
28 [KKT2014] 1412 EmG 17 47 12.81 +65 33 24.3           ~ 2 0
29 [KKT2014] 4C 65.22 cluster C?G 17 47 13.8 +65 32 35           ~ 2 0
30 4C 65.22 QSO 17 47 13.90970 +65 32 35.5909     21.2     ~ 23 1
31 [KKT2014] 1151 EmG 17 47 14.15 +65 32 49.0           ~ 2 0
32 [KKT2014] 1369 EmG 17 47 14.44 +65 33 18.2           ~ 2 0
33 [KKT2014] 1046 EmG 17 47 14.80 +65 32 34.6           ~ 2 0
34 [KKT2014] 1248 EmG 17 47 16.44 +65 33 02.4           ~ 2 0
35 [KKT2014] 1006 EmG 17 47 17.19 +65 32 28.4           ~ 2 0
36 [KKT2014] 293 EmG 17 47 17.28 +65 30 50.7           ~ 2 0
37 [KKT2014] 1249 EmG 17 47 17.68 +65 33 00.8           ~ 2 0
38 [KKT2014] 1339 EmG 17 47 23.54 +65 33 08.0           ~ 2 0
39 [KKT2014] 1338 EmG 17 47 23.59 +65 33 07.6           ~ 1 0
40 [KKT2014] 1193 EmG 17 47 25.91 +65 32 55.2           ~ 2 0
41 [KKT2014] 1502 EmG 17 47 30.00 +65 33 42.4           ~ 1 0
42 [KKT2014] 1292 EmG 17 47 30.33 +65 33 10.6           ~ 2 0
43 [KKT2014] 761 EmG 17 47 34.46 +65 31 52.0           ~ 1 0
44 [KKT2014] 874 EmG 17 47 38.03 +65 32 09.0           ~ 2 0
45 [KKT2014] 1247 EmG 17 47 38.09 +65 33 01.8           ~ 1 0
46 [KKT2014] 1461 EmG 17 47 38.26 +65 33 35.4           ~ 2 0
47 [KKT2014] 1259 EmG 17 47 38.53 +65 33 03.6           ~ 2 0
48 NAME NEP reg 18 00 00.000 +66 33 38.55           ~ 430 0
49 ClG J2235-2557 ClG 22 35 20.6 -25 57 42           ~ 151 0

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