2008MNRAS.390..289J

Query : 2008MNRAS.390..289J

2008MNRAS.390..289J - Mon. Not. R. Astron. Soc., 390, 289-303 (2008/October-2)

Radio observations of the Horologium-Reticulum supercluster - I. A3158: excess star-forming galaxies in a merging cluster ?

JOHNSTON-HOLLITT M., SATO M., GILL J.A., FLEENOR M.C. and BRICK A.-M.

Abstract (from CDS):

We present 1.4- and 2.5-GHz Australia Telescope Compact Array (ATCA) observations of the galaxy cluster A3158 (z = 0.0597) which is located within the central part of the Horologium-Reticulum supercluster (HRS). Spectroscopic data for the central part of the HRS suggest that A3158 is in a dynamically important position within the supercluster and that it is moving toward the double cluster system A3125/A3128 which marks the centre of the HRS. A total of 110 radio galaxies are detected in a 35-arcmin radius about the cluster at 1.4GHz, of which 30 are also detected at 2.5GHz. We examine the source counts and compute the radio luminosity function (RLF) at 1.4GHz from the subset of 88 sources found within the full-width half-power area of the ATCA beam. Comparison of the source counts in the area over the background, as computed by Prandoni et al., shows some evidence of an excess of galaxies with L1.4GHz≤ 2x1022W/Hz. This result seems to indicate a star-forming population and is a result similar to that found recently by Owen et al. for the merging cluster A2125. In addition we find that the RLF for early-type galaxies (E and S0) below logP1.4∼ 22.5 is lower than that found for a composite cluster environment but is similar to the early-type RLF for clusters in the centre of the Shapley supercluster which are believed to be in the latter stages of merging. This result implies that the cores of superclusters are environments where radio emission, particularly resultant from active galactic nucleus (AGN), is suppressed in the later stages of merging. Thus, radio observations of clusters might be sensitive indicators of the precise merger stage of the cluster but more observational evidence is still required to establish this trend.

Abstract Copyright: © 2008 The Authors. Journal compilation © 2008 RAS

Journal keyword(s): galaxies: clusters: general - galaxies: clusters: individual: A3158 - radio continuum: galaxies

VizieR on-line data: <Available at CDS (J/MNRAS/390/289): table3.dat table4.dat table5.dat>

Nomenclature: Tables 3, 4, 5: [JSG2008] JHHMMSS.ss+DDMMSS.s N=52+36+22.

Simbad objects: 130

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Number of rows : 130
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 HOR-RET SUPERCL SCG 03 16 -48.0           ~ 70 3
2 ACO 3125 ClG 03 27 22 -53 30.6           ~ 57 2
3 ACO 3128 ClG 03 29 50.6 -52 34 48           ~ 183 3
4 LEDA 13507 G 03 40 13.1235734808 -53 32 00.022657272   16.28   14.78   ~ 9 0
5 [JSG2008] J034045.93-534252.4 rG 03 40 45.86 -53 42 52.7   22.63       ~ 1 0
6 [JSG2008] J034048.04-531818.3 rG 03 40 48.09 -53 18 19.0   22.42       ~ 1 0
7 [JSG2008] J034052.42-535309.7 rG 03 40 52.46 -53 53 10.8   22.56       ~ 1 0
8 [JSG2008] J034059.16-533419.7 rG 03 40 59.16 -53 34 19.7           ~ 1 0
9 [JSG2008] J034106.40-532216.9 rG 03 41 06.33 -53 22 18.2   19.06       ~ 1 0
10 APMUKS (BJ) B033949.49-535002.2 rG 03 41 08.44 -53 40 28.3   20.08       ~ 1 0
11 [JSG2008] J034111.17-534250.7 rG 03 41 11.17 -53 42 50.7           ~ 1 0
12 [JSG2008] J034111.43-531926.7 rG 03 41 11.43 -53 19 26.7           ~ 1 0
13 [JSG2008] J034114.84-532928.7 rG 03 41 14.85 -53 29 29.5   19.09       ~ 1 0
14 [JSG2008] J034118.40-535417.7 rG 03 41 18.45 -53 54 17.1   19.30       ~ 1 0
15 [JSG2008] J034120.89-534756.9 rG 03 41 20.98 -53 47 57.0   21.17       ~ 1 0
16 [JSG2008] J034123.13-532306.4 rG 03 41 23.28 -53 23 06.3   22.24       ~ 1 0
17 [JSG2008] J034128.69-531721.5 rG 03 41 29.32 -53 17 23.6   16.90       ~ 1 0
18 [JSG2008] J034130.82-534807.6 rG 03 41 30.82 -53 48 07.6           ~ 1 0
19 [JSG2008] J034135.52-533456.5 rG 03 41 35.50 -53 34 55.7   21.33       ~ 1 0
20 [JSG2008] J034137.60-534800.1 rG 03 41 37.60 -53 48 00.1           ~ 1 0
21 [JSG2008] J034140.55-533938.9 rG 03 41 40.55 -53 39 38.9           ~ 1 0
22 [JSG2008] J034141.23-532335.6 rG 03 41 41.23 -53 23 35.6           ~ 1 0
23 [JSG2008] J034141.44-534758.3 rG 03 41 41.44 -53 47 58.3           ~ 1 0
24 PMN J0341-5359 rG 03 41 41.90 -53 59 26.2           ~ 4 1
25 [JSG2008] J034143.44-534053.0 rG 03 41 43.46 -53 40 53.1   17.26       ~ 1 0
26 2MASX J03414449-5342216 SyG 03 41 44.5130843856 -53 42 21.117751128   16.78       ~ 10 0
27 [JSG2008] J034148.26-531923.1 rG 03 41 48.26 -53 19 23.1           ~ 1 0
28 LEDA 430299 EmG 03 41 49.165 -53 24 13.62   17.59       ~ 20 0
29 2MASX J03415075-5402298 rG 03 41 50.753 -54 02 29.82   18.10       ~ 1 0
30 APMUKS (BJ) B034042.78-535747.3 rG 03 42 01.25 -53 48 16.0   20.22       ~ 1 0
31 [JSG2008] J034201.45-532945.5 rG 03 42 01.45 -53 29 45.5           ~ 1 0
32 PMN J0342-5334 rG 03 42 03.81 -53 35 05.8   22.47       ~ 2 1
33 LEDA 426946 EmG 03 42 04.360 -53 42 50.35   17.20       ~ 9 0
34 [JSG2008] J034207.71-533035.9 rG 03 42 07.71 -53 30 35.9           ~ 1 0
35 [JSG2008] J034207.74-531629.3 rG 03 42 07.74 -53 16 29.3           ~ 1 0
36 LEDA 424669 GiC 03 42 08.509 -53 55 44.37   18.04       ~ 5 0
37 [JSG2008] J034209.48-531849.9 rG 03 42 09.48 -53 18 49.9           ~ 1 0
38 LEDA 13603 EmG 03 42 11.8230198984 -53 23 27.442998276   15.76       ~ 19 0
39 [JSG2008] J034213.60-535536.3 rG 03 42 13.44 -53 55 37.1   22.69       ~ 1 0
40 [JSG2008] J034219.43-532611.7 rG 03 42 19.43 -53 26 11.7           ~ 1 0
41 [JSG2008] J034219.26-535522.6 rG 03 42 19.45 -53 55 21.8   20.37       ~ 1 0
42 LEDA 145767 GiC 03 42 20.8659682152 -53 17 57.494117256   16.52       ~ 9 0
43 APMUKS (BJ) B034105.75-534709.6 rG 03 42 24.65 -53 37 42.3   20.16       ~ 1 0
44 [JSG2008] J034234.15-533320.7 rG 03 42 34.15 -53 33 20.7           ~ 1 0
45 6dFGS gJ034234.4-533746 rG 03 42 34.3572771432 -53 37 45.564598092   16.86       ~ 9 0
46 [JSG2008] J034237.29-533308.8 rG 03 42 37.24 -53 33 09.0   21.94       ~ 1 0
47 [JSG2008] J034239.82-540408.5 rG 03 42 39.82 -54 04 08.5           ~ 1 0
48 [JSG2008] J034240.55-530951.9 rG 03 42 40.55 -53 09 51.9           ~ 1 0
49 [JSG2008] J034240.78-535339.3 rG 03 42 40.75 -53 53 39.3   21.40       ~ 1 0
50 [JSG2008] J034241.33-533252.8 rG 03 42 41.33 -53 32 52.8           ~ 1 0
51 [JSG2008] J034244.50-532532.0 rG 03 42 44.50 -53 25 32.0           ~ 1 0
52 [JSG2008] J034248.03-534956.0 rG 03 42 48.08 -53 49 55.7   15.68       ~ 1 0
53 [JSG2008] J034249.22-531006.1 rG 03 42 49.22 -53 10 06.1           ~ 1 0
54 [JSG2008] J034249.18-533913.0 rG 03 42 49.29 -53 39 12.2   22.16       ~ 1 0
55 [JSG2008] J034251.66-532516.0 rG 03 42 51.66 -53 25 16.0           ~ 1 0
56 [JSG2008] J034251.87-534456.7 rG 03 42 51.87 -53 44 56.7           ~ 1 0
57 [JSG2008] J034252.09-535947.9 rG 03 42 52.09 -53 59 47.9           ~ 1 0
58 LEDA 13641 BiC 03 42 52.9677368568 -53 37 52.547974500   16.15       ~ 25 1
59 [JSG2008] J034254.80-534324.8 rG 03 42 54.80 -53 43 24.8           ~ 1 0
60 [JSG2008] J034256.80-532445.9 rG 03 42 56.80 -53 24 45.9           ~ 1 0
61 [JSG2008] J034256.86-540231.1 rG 03 42 56.86 -54 02 31.1           ~ 1 0
62 [JSG2008] J034258.37-532359.8 rG 03 42 58.37 -53 23 59.8           ~ 1 0
63 2MASX J03425857-5341306 rG 03 42 58.5600238728 -53 41 30.607570536   18.07       ~ 3 0
64 [JSG2008] J034259.93-532349.7 rG 03 42 59.95 -53 23 51.3   18.45       ~ 1 0
65 ESO 156-8 BiC 03 43 00.4436522688 -53 38 17.280174300   15.55   13.64   ~ 35 2
66 2MASX J03430668-5341396 rG 03 43 06.7201260720 -53 41 39.666659640   17.61       ~ 5 0
67 ACO 3158 ClG 03 43 07.5 -53 38 09           ~ 327 0
68 [JSG2008] J034310.67-535600.7 rG 03 43 10.67 -53 56 00.7           ~ 1 0
69 [JSG2008] J034311.33-535329.3 rG 03 43 11.39 -53 53 28.9   17.44       ~ 1 0
70 2MASX J03431618-5339365 rG 03 43 16.1365673832 -53 39 36.044957520   16.79       ~ 8 0
71 [JSG2008] J034316.70-534736.2 rG 03 43 16.70 -53 47 36.2           ~ 1 0
72 [JSG2008] J034322.80-532826.1 rG 03 43 22.72 -53 28 28.6   20.98       ~ 1 0
73 LEDA 426858 rG 03 43 25.3824 -53 43 19.596   17.93       ~ 3 0
74 [JSG2008] J034329.03-532549.6 rG 03 43 29.01 -53 25 50.1   21.13       ~ 1 0
75 LEDA 13679 BiC 03 43 29.681 -53 41 31.69   15.76       ~ 22 0
76 APMUKS (BJ) B034212.50-535820.4 rG 03 43 30.521 -53 48 54.49   19.30       ~ 4 0
77 [JSG2008] J034333.79-541119.1 rG 03 43 33.71 -54 11 19.8   17.55       ~ 2 0
78 [JSG2008] J034338.73-534238.0 rG 03 43 38.73 -53 42 38.0           ~ 1 0
79 LEDA 13697 EmG 03 43 46.009 -53 42 46.70   17.16       ~ 9 0
80 [JSG2008] J034347.53-533241.6 rG 03 43 47.46 -53 32 40.0   20.86       ~ 1 0
81 WINGS J034347.59-532223.1 rG 03 43 47.5944 -53 22 23.124   19.46       ~ 2 0
82 [JSG2008] J034349.39-532528.8 rG 03 43 49.53 -53 25 28.3   15.56       ~ 1 0
83 LEDA 128692 EmG 03 43 59.6257951632 -53 55 17.820049800   16.12       ~ 13 0
84 [JSG2008] J034404.87-534248.8 rG 03 44 04.87 -53 42 48.8           ~ 1 0
85 [JSG2008] J034407.32-534156.7 rG 03 44 07.32 -53 41 56.7           ~ 1 0
86 APMUKS (BJ) B034252.48-540029.1 rG 03 44 10.2733978848 -53 51 06.496740468   20.24       ~ 3 0
87 [JSG2008] J034410.78-535141.3 rG 03 44 10.77 -53 51 41.3   21.20       ~ 1 0
88 [JSG2008] J034411.65-534336.3 rG 03 44 11.72 -53 43 34.9   21.89       ~ 1 0
89 LEDA 13722 G 03 44 16.8218694024 -54 04 22.777752792   15.89   13.97   ~ 11 0
90 [JSG2008] J034418.13-534152.0 rG 03 44 18.06 -53 41 51.7   20.31       ~ 1 0
91 ESO 156-9 IG 03 44 18.1 -54 04 20           ~ 1 0
92 LEDA 426642 GiC 03 44 21.0819149856 -53 44 30.283270368   17.96       ~ 6 0
93 [JSG2008] J034421.23-534023.8 rG 03 44 21.40 -53 40 23.8   21.31       ~ 1 0
94 LEDA 426962 EmG 03 44 22.562 -53 42 46.07   17.83       ~ 6 0
95 [JSG2008] J034423.84-535931.9 rG 03 44 23.84 -53 59 31.9   22.57       ~ 1 0
96 [JSG2008] J034429.90-533733.2 rG 03 44 29.90 -53 37 33.2           ~ 1 0
97 [JSG2008] J034432.32-535317.5 rG 03 44 32.32 -53 53 17.5           ~ 1 0
98 [JSG2008] J034440.90-534222.2 rG 03 44 40.90 -53 42 22.2           ~ 1 0
99 [JSG2008] J034444.93-534145.9 rG 03 44 44.93 -53 41 45.9           ~ 1 0
100 [JSG2008] J034449.41-533631.5 rG 03 44 49.41 -53 36 31.5           ~ 1 0
101 [JSG2008] J034455.60-532944.5 rG 03 44 55.45 -53 29 43.9   21.78       ~ 1 0
102 [JSG2008] J034506.75-531544.6 rG 03 45 06.75 -53 15 44.6           ~ 1 0
103 [JSG2008] J034507.08-532622.9 rG 03 45 07.19 -53 26 22.0   21.47       ~ 1 0
104 [JSG2008] J034514.30-533128.7 rG 03 45 14.29 -53 31 26.7   22.29       ~ 1 0
105 [JSG2008] J034519.13-533722.4 rG 03 45 19.13 -53 37 22.4           ~ 1 0
106 [JSG2008] J034526.35-534127.5 rG 03 45 26.35 -53 41 27.5           ~ 1 0
107 [JSG2008] J034527.46-533357.3 rG 03 45 27.46 -53 33 57.3           ~ 1 0
108 LEDA 13766 GiC 03 45 29.5051705824 -53 39 36.817973172   16.27       ~ 9 0
109 [JSG2008] J034536.86-534020.2 rG 03 45 36.86 -53 40 20.2           ~ 1 0
110 [JSG2008] J034541.95-533907.5 rG 03 45 41.95 -53 39 07.5           ~ 1 0
111 [JSG2008] J034541.98-533251.4 rG 03 45 42.04 -53 32 52.0   20.99       ~ 1 0
112 [JSG2008] J034547.18-533640.8 rG 03 45 47.18 -53 36 40.8           ~ 1 0
113 2MASX J03454747-5322261 rG 03 45 47.4356271576 -53 22 25.796817192   18.00       ~ 4 0
114 [JSG2008] J034553.65-533903.8 rG 03 45 53.65 -53 39 03.8           ~ 1 0
115 PMN J0346-5315 rG 03 46 05.2 -53 15 20           ~ 3 1
116 [JSG2008] J034702.60-534439.7 rG 03 47 02.60 -53 44 39.7           ~ 1 0
117 QSO B0355-669 QSO 03 55 47.8826471232 -66 45 33.817113540   17.3       ~ 34 1
118 QSO B0355-483 Bla 03 57 21.9179670240 -48 12 15.159541932   16.71 16.38 16.08   ~ 84 1
119 ACO 3528 ClG 12 54 18.2 -29 01 16           ~ 166 1
120 NAME Shapley Supercluster SCG 13 06.0 -33 04           ~ 677 0
121 ACO 3556 ClG 13 24 06.2 -31 39 38           ~ 159 0
122 ACO 3558 ClG 13 28 03.2 -31 31 35           ~ 476 2
123 BAX 202.9000-31.8128 ClG 13 31 28.8 -31 49 40           ~ 88 1
124 ACO 3562 ClG 13 33 31.8 -31 40 23           ~ 337 1
125 ACO 3571 ClG 13 47 32.4 -32 50 12           ~ 308 2
126 ACO 2111 ClG 15 39 40.9 +34 25 04           ~ 188 0
127 ACO 2125 ClG 15 41 14.1 +66 15 57           ~ 124 1
128 ACO 2256 ClG 17 03 37.5 +78 37 23           ~ 928 1
129 ACO 2255 ClG 17 12 56.0 +64 04 06           ~ 605 0
130 ICRF J193925.0-634245 Sy2 19 39 25.0245304992 -63 42 45.640373400   18.87 18.37 17.64   ~ 1332 2

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