2002ApJ...580..774E

Query : 2002ApJ...580..774E

2002ApJ...580..774E - Astrophys. J., 580, 774-788 (2002/December-1)

A systematic X-ray search for clusters of galaxies behind the Milky Way.

EBELING H., MULLIS C.R. and TULLY R.B.

Abstract (from CDS):

We report on the design and status of the Clusters in the Zone of Avoidance (CIZA) project, the first systematic X-ray search for clusters of galaxies behind the Milky Way. We demonstrate that an X-ray survey can find galaxy clusters at low Galactic latitude where optical searches are inefficient because of massive obscuration and extinction problems. We discuss the rationale for such a survey in the context of large-scale structure studies and describe in detail the combined X-ray/optical/NIR approach used by CIZA to identify clusters of galaxies at|b|<20°, a region of the sky that has traditionally been excluded from earlier cluster catalogs. So far, CIZA has identified and spectroscopically confirmed 137 galaxy clusters in what used to be the zone of avoidance; additional clusters have been confirmed in imaging observations and await spectroscopic observation. We present a catalog of the 73 X-ray-brightest CIZA clusters, 53 (73%) of which are new discoveries. This sample is statistically complete out to at least z∼0.075 (cz∼22,500 km.s–1). We reassess local large-scale structure in the Great Attractor (GA) region in light of this first X-ray-selected cluster sample at low Galactic latitude. Our survey discovered CIZA J1324.7-5736, a luminous cluster at l=307°.4, b=5°.0, cz=5700 km.s–1, and possibly as massive as A3627, but ruled out a hypothesized X-ray-luminous cluster around the radio galaxy PKS 1343-601. We argue that this region of the GA may be best described as a wall-like, triangular structure with CIZA J1324.7-5736, A3627, and the Centaurus Cluster (A3526) at its vertices. Our survey also discovered what could be a supercluster in the same region but at cz∼15,000 km.s–1, i.e., behind the GA. We speculate that the latter system may be partly responsible for the large-scale flow observed in this direction out to about that distance.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: Clusters: General - Surveys - X-Rays: Galaxies: Clusters

VizieR on-line data: <Available at CDS (J/ApJ/580/774): table1.dat refs.dat>

Nomenclature: Table 1: CIZA JHHMM.m+DDMM N=73.

Simbad objects: 88

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Number of rows : 88
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 PSC-CET SUPERCL SCG 00 33 -21.0           ~ 67 2
2 ZwCl 0104+5350 ClG 01 07 43.2 +54 08 43           ~ 35 0
3 CIZA J0108.0+7558 ClG 01 08 01.1 +75 58 40           ~ 5 0
4 ACO 207 ClG 01 29 08 -02 29.5           ~ 8 0
5 CIZA J0214.2+5144 ClG 02 14 16.2 +51 44 48           ~ 5 0
6 2A 0251+413 ClG 02 54 26.6 +41 33 25           ~ 328 1
7 CIZA J0300.7+4427 ClG 03 00 45.0 +44 27 47           ~ 20 0
8 ACO 407 ClG 03 01 43.7 +35 49 48           ~ 113 0
9 NAME HOR-RET SUPERCL SCG 03 16 -48.0           ~ 70 3
10 ACO 426 ClG 03 19 47.6 +41 30 54           ~ 2508 1
11 RXC J0450.0+4501 ClG 04 50 13.9 +45 03 17           ~ 45 1
12 CIZA J0515.3+5845 ClG 05 15 20.5 +58 45 59           ~ 8 0
13 CIZA J0516.3+1712 ClG 05 16 20.6 +17 12 33           ~ 11 0
14 ACO 539 ClG 05 16 35.1 +06 27 14           ~ 255 2
15 1RXS J051657.3+292519 ClG 05 16 58.4 +29 25 14           ~ 6 0
16 1RXS J052247.7+280621 ClG 05 22 47.7 +28 06 32           ~ 6 0
17 CIZA J0524.4+0819 ClG 05 24 27.5 +08 19 44           ~ 4 0
18 RXC J0602.0+5315 ClG 06 02 01.5 +53 15 48           ~ 6 0
19 2E 0559.1+2310 ClG 06 02 07.4 +23 09 57           ~ 5 0
20 CIZA J0603.8+2939 ClG 06 03 49.6 +29 39 53           ~ 7 0
21 ACO 553 ClG 06 12 25.8 +48 37 26           ~ 49 0
22 ACO 3392 ClG 06 27 05.6 -35 29 30           ~ 36 2
23 ZwCl 0628+2502 ClG 06 31 21.4 +25 00 58           ~ 24 0
24 CIZA J0635.0+2231 ClG 06 35 03.4 +22 31 30           ~ 15 0
25 CIZA J0640.1-1253 ClG 06 40 08.0 -12 53 19           ~ 7 0
26 CIZA J0643.4+4214 ClG 06 43 24.9 +42 14 42           ~ 6 0
27 CIZA J0649.3+1801 ClG 06 49 22.8 +18 01 00           ~ 16 0
28 7C 070833.00+322406.00 Sy2 07 11 47.6688944536 +32 18 35.939571104     15.8     ~ 40 1
29 CIZA J0711.7+3219 ClG 07 11 48.00 +32 19 02.0           ~ 7 0
30 2MAXI J0715-363 ClG 07 17 10.8 -36 21 37           ~ 8 0
31 CIZA J0717.4-1119 ClG 07 17 27.0 -11 19 53           ~ 5 0
32 CIZA J0719.5+0043 ClG 07 19 34.6 +00 43 07           ~ 12 0
33 ACO 592 ClG 07 42 31.1486 +09 22 25.893           ~ 62 1
34 PKS 0745-19 rG 07 47 31.3247085936 -19 17 40.013334276   19.60       ~ 422 1
35 ClG 0745-1910 ClG 07 47 32.4 -19 18 23           ~ 378 0
36 ACO S 606 ClG 07 57 46.5 -53 15 49           ~ 8 0
37 CIZA J0812.5-5714 ClG 08 12 30.3 -57 14 06           ~ 21 0
38 ACO 644 ClG 08 17 26.1 -07 31 13           ~ 241 0
39 CIZA J0818.2+0122 ClG 08 18 13.7 +01 22 03           ~ 4 0
40 CIZA J0820.9-5704 ClG 08 20 59.6 -57 04 47           ~ 16 0
41 ACO S 610 ClG 08 26 27.7 -27 21 18           ~ 5 0
42 ACO S 611 ClG 08 26 46.2 -20 07 58           ~ 10 0
43 ACO 3411 ClG 08 41 47.7 -17 28 46           ~ 81 0
44 NAME Hydra I Cluster ClG 10 36 36.0 -27 31 04           ~ 905 1
45 CIZA J1040.7-7047 ClG 10 40 44.8 -70 47 49           ~ 8 0
46 CIZA J1130.0-4213 ClG 11 30 05.6 -42 13 47           ~ 11 0
47 CIZA J1145.6-5420 ClG 11 45 38.6 -54 20 29           ~ 11 0
48 NAME Virgo Cluster ClG 12 30 47.8 +12 23 07           ~ 7107 0
49 CIZA J1240.2-4825 ClG 12 40 13.7 -48 25 58           ~ 10 0
50 ACO 3526 ClG 12 48 49.2 -41 18 17           ~ 1154 2
51 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 5141 2
52 CIZA J1324.7-5736 ClG 13 24 36.0 -57 32 55           ~ 29 1
53 NAME Cen B QSO 13 46 49.04248361 -60 24 29.3553900         15.74 ~ 165 0
54 NAME IC 4329 Group GrG 13 48 36.4 -30 30 13           ~ 147 2
55 ACO 3581 ClG 14 07 29.8 -27 01 04           ~ 197 3
56 2MAXI J1408-508 ClG 14 07 52.5 -51 00 33           ~ 14 0
57 CIZA J1410.4-4246 ClG 14 10 28.5 -42 46 37           ~ 14 0
58 CIZA J1423.7-5412 ClG 14 23 43.3 -54 12 12           ~ 5 0
59 CIZA J1514.6-4558 ClG 15 14 33.2 -45 59 20           ~ 13 0
60 CIZA J1601.7-7544 ClG 16 01 46.7 -75 44 46           ~ 40 0
61 ACO 3627 ClG 16 14 22.5 -60 52 07           ~ 340 2
62 2MAXI J1626-333 ClG 16 26 26.2 -33 29 41           ~ 8 0
63 ACO 3628 ClG 16 32 43.1 -75 07 56           ~ 33 2
64 BAX 249.5848-64.5165 ClG 16 38 13.2 -64 21 21           ~ 123 0
65 CIZA J1645.4-7334 ClG 16 45 26.2 -73 34 54           ~ 16 0
66 CIZA J1646.6-6023 ClG 16 46 41.4 -60 24 05           ~ 10 0
67 CIZA J1653.0-5943 ClG 16 53 09.5 -59 41 28           ~ 23 0
68 BAX 258.1082-23.3759 ClG 17 12 26.3 -23 21 38           ~ 303 0
69 1RXS J172658.4-031729 ClG 17 26 58.6 -03 17 43           ~ 6 0
70 CIZA J1735.7-0721 ClG 17 35 47.7 -07 21 44           ~ 4 0
71 CIZA J1752.0-6348 ClG 17 52 05.6 -63 48 59           ~ 12 0
72 CIZA J1757.7-0108 ClG 17 57 43.3 -01 08 35           ~ 4 0
73 CIZA J1759.0-1333 ClG 17 59 02.9 -13 33 16           ~ 4 0
74 CIZA J1802.4-5236 ClG 18 02 29.4 -52 36 33           ~ 7 0
75 CIZA J1804.1+0042 ClG 18 04 10.7 +00 42 20           ~ 13 0
76 CIZA J1804.4+1002 ClG 18 04 31.0476 +10 03 19.069           ~ 28 0
77 CIZA J1825.3+3026 ClG 18 25 22.8 +30 26 32           ~ 58 0
78 CIZA J1857.6+3800 ClG 18 57 39.5 +38 00 30           ~ 24 0
79 ACO 2319 ClG 19 21 14.0 +43 56 57           ~ 495 1
80 CIZA J1930.0-1509 ClG 19 30 01.6 -15 09 45           ~ 8 0
81 CIZA J1938.3+5409 ClG 19 38 18.6 +54 09 33           ~ 42 0
82 BAX 299.8681+40.7339 ClG 19 59 30.3 +40 44 11           ~ 143 0
83 CIZA J2040.1+1712 ClG 20 40 11.6 +17 12 50           ~ 9 0
84 CIZA J2042.1+2426 ClG 20 42 07.0 +24 26 28           ~ 5 0
85 1RXS J204842.6+251513 ClG 20 48 41.3 +25 15 11           ~ 5 0
86 CIZA J2156.4+3318 ClG 21 56 24.6 +33 18 37           ~ 5 0
87 NGC 7242 GiG 22 15 39.507 +37 17 55.48   14.6       ~ 50 0
88 CIZA J2318.6+4257 ClG 23 18 39.3 +42 57 57           ~ 11 0

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