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Query : 1999ApJ...519..533D |
1999ApJ...519..533D - Astrophys. J., 519, 533-548 (1999/July-2)
ROSAT PSPC observations of the richest (R≥2) ACO clusters.
DAVID L.P., FORMAN W. and JONES C.
Abstract (from CDS):
Because of the large field of view of the PSPC, many rich clusters were serendipitously observed during the GO phase of the ROSAT mission. Of the 150 clusters in our sample, 82 were observed serendipitously and 68 were targeted observations. The overall detection rate of serendipitously observed clusters is quite high at 76%. However, the detection rate is sensitive to the optical properties of clusters, and the details of the optical selection process. For example, all serendipitously observed Bautz-Morgan type I and type I-II clusters are detected, while only 71% of Bautz-Morgan type II, type II-III, and type III clusters are detected. Beyond z~0.1, 83% of the observed Abell clusters are detected, compared to only 60% of southern ACO clusters. Due to the long integration times in pointed PSPC observations, the typical X-ray luminosity threshold for detection is quite low at ∼1043 ergs.s–1 for clusters within z=0.2. This luminosity is more characteristic of an X-ray luminous group rather than a rich cluster. The nondetected clusters must therefore be either highly unrelaxed systems or have an optical richness that is significantly overestimated due to contamination by interloping galaxies. We show that the later possibility is more likely, since low X-ray luminosity clusters are preferentially found in denser cluster environments compared with X-ray luminous clusters. This contrast in cluster environment makes low X-ray luminosity clusters more susceptible to galaxy contamination than luminous systems. The fraction of clusters less luminous than an X-ray luminous group is thus a direct quantitative measure of contamination in the ACO catalog. We also find that the X-ray luminosity function of Abell clusters is not consistent with that of southern ACO clusters. Only by comparing R≥2 Abell clusters with R≥3 southern ACO clusters can we obtain consistency in their X-ray properties. This indicates that the optical richness of southern ACO clusters is overestimated by about 1 richness class.
Abstract Copyright: ∼
Journal keyword(s): Catalogs - Galaxies: Clusters: General - Surveys - X-Rays: Galaxies
VizieR on-line data: <Available at CDS (J/ApJ/519/533): table1.dat>
Nomenclature: Table 1: [DFJ99] ACO NNNNW (Nos 625W, 625E, 1758S, 1758N, 2246W, 2246E).
Simbad objects: 147
Number of rows : 147 |
N | Identifier | Otype |
ICRS (J2000) RA |
ICRS (J2000) DEC |
Mag U | Mag B | Mag V | Mag R | Mag I | Sp type |
#ref
1850 - 2024 |
#notes |
---|---|---|---|---|---|---|---|---|---|---|---|---|
1 | ACO 11 | ClG | 00 12 44 | -16 26.3 | ~ | 23 | 0 | |||||
2 | ACO 2744 | ClG | 00 14 20.03 | -30 23 17.8 | ~ | 816 | 0 | |||||
3 | ACO 115 | ClG | 00 55 59.5 | +26 19 14 | ~ | 270 | 1 | |||||
4 | ACO 135 | ClG | 01 03 14 | -22 34.9 | ~ | 8 | 0 | |||||
5 | ACO 192 | ClG | 01 24 18.4 | +04 27 34 | ~ | 21 | 0 | |||||
6 | ACO 222 | ClG | 01 37 31.1 | -12 59 30 | ~ | 140 | 1 | |||||
7 | ACO 223 | ClG | 01 37 55.9 | -12 49 11 | ~ | 122 | 1 | |||||
8 | ACO 314 | ClG | 02 09 37 | -12 53.8 | ~ | 5 | 0 | |||||
9 | ACO 401 | ClG | 02 58 56.9 | +13 34 56 | ~ | 566 | 0 | |||||
10 | ACO 3093 | ClG | 03 10 52.0 | -47 23 43 | ~ | 34 | 0 | |||||
11 | ACO 3112 | ClG | 03 17 52.4 | -44 14 35 | ~ | 311 | 1 | |||||
12 | ACO 426 | ClG | 03 19 47.2 | +41 30 47 | ~ | 2265 | 1 | |||||
13 | ACO 432 | ClG | 03 24 04 | -05 48.4 | ~ | 8 | 0 | |||||
14 | ACO 3128 | ClG | 03 29 50.6 | -52 34 48 | ~ | 177 | 3 | |||||
15 | ACO 3135 | ClG | 03 34 03.7 | -39 00 49 | ~ | 35 | 0 | |||||
16 | ACO 3139 | ClG | 03 36 34 | -23 39.1 | ~ | 3 | 0 | |||||
17 | ACO 448 | ClG | 03 38 40 | -11 07.3 | ~ | 7 | 0 | |||||
18 | ACO 3158 | ClG | 03 42 39.6 | -53 37 50 | ~ | 305 | 0 | |||||
19 | ACO 3223 | ClG | 04 08 34.5 | -30 49 08 | ~ | 53 | 2 | |||||
20 | ACO 478 | ClG | 04 13 20.7 | +10 28 35 | ~ | 502 | 0 | |||||
21 | ACO 3259 | ClG | 04 28 42.4 | -38 05 47 | ~ | 10 | 0 | |||||
22 | ACO 3263 | ClG | 04 30 39 | -38 04.6 | ~ | 3 | 0 | |||||
23 | ACO 494 | ClG | 04 30 49 | -07 44.6 | ~ | 8 | 0 | |||||
24 | ACO 3266 | ClG | 04 31 11.9 | -61 24 23 | ~ | 411 | 0 | |||||
25 | ACO 520 | ClG | 04 54 10.1 | +02 55 38 | ~ | 436 | 0 | |||||
26 | ACO 3297 | ClG | 04 58 20 | -30 08.5 | ~ | 11 | 1 | |||||
27 | ACO 530 | ClG | 05 00 32 | -00 51.6 | ~ | 7 | 0 | |||||
28 | ACO 3301 | ClG | 05 01 05.8 | -38 43 58 | ~ | 38 | 0 | |||||
29 | ACO 3305 | ClG | 05 01 52 | -39 12.7 | ~ | 9 | 0 | |||||
30 | ACO 3312 | ClG | 05 03 54 | -56 55.9 | ~ | 7 | 0 | |||||
31 | ACO 536 | ClG | 05 07 47 | -09 14.1 | ~ | 24 | 0 | |||||
32 | ACO 545 | ClG | 05 32 24.4152 | -11 32 35.080 | ~ | 97 | 0 | |||||
33 | ACO 3360 | ClG | 05 40 18.8 | -43 23 31 | ~ | 28 | 0 | |||||
34 | ACO 563 | ClG | 06 57 53 | +69 01.0 | ~ | 7 | 0 | |||||
35 | ACO 571 | ClG | 07 18 53 | +71 52.6 | ~ | 10 | 0 | |||||
36 | ACO 574 | ClG | 07 20 00 | +70 57.5 | ~ | 8 | 0 | |||||
37 | ACO 586 | ClG | 07 32 20.3 | +31 37 58 | ~ | 180 | 0 | |||||
38 | ACO 625 | ClG | 08 28 10 | +82 22.2 | ~ | 22 | 0 | |||||
39 | ACO 665 | ClG | 08 30 45.2 | +65 52 55 | ~ | 437 | 0 | |||||
40 | ACO 686 | ClG | 08 47 45.9 | +77 41 31 | ~ | 13 | 0 | |||||
41 | ACO 754 | ClG | 09 09 08.4 | -09 39 58 | ~ | 667 | 1 | |||||
42 | ACO 764 | ClG | 09 16 47.08 | +63 48 41.5 | ~ | 13 | 0 | |||||
43 | ACO 782 | ClG | 09 21 58 | +51 58.2 | ~ | 7 | 0 | |||||
44 | ACO 777 | ClG | 09 27 27.1 | +78 15 29 | ~ | 28 | 0 | |||||
45 | ACO 787 | ClG | 09 28 33 | +74 23.9 | ~ | 34 | 0 | |||||
46 | ACO 3426 | ClG | 09 43 53 | -30 49.8 | ~ | 3 | 0 | |||||
47 | ACO 873 | ClG | 09 52 44 | +71 17.9 | ~ | 14 | 0 | |||||
48 | ACO 914 | ClG | 10 08 26.0 | +71 14 19 | ~ | 25 | 1 | |||||
49 | ACO 3438 | ClG | 10 14 41 | -28 33.9 | ~ | 3 | 0 | |||||
50 | ACO 3440 | ClG | 10 15 47 | -29 21.0 | ~ | 3 | 0 | |||||
51 | ACO 963 | ClG | 10 17 03.4 | +39 02 56 | ~ | 400 | 0 | |||||
52 | ACO 968 | ClG | 10 21 09 | +68 15.9 | ~ | 15 | 0 | |||||
53 | ACO 981 | ClG | 10 24 19.1 | +68 04 56 | ~ | 29 | 0 | |||||
54 | ACO 998 | ClG | 10 26 17 | +67 57.7 | ~ | 17 | 0 | |||||
55 | ACO 1005 | ClG | 10 27 29 | +68 13.7 | ~ | 14 | 0 | |||||
56 | ACO 1035 | ClG | 10 32 05.91 | +40 17 25.9 | ~ | 84 | 0 | |||||
57 | ACO 1046 | ClG | 10 37 33 | +67 57.4 | ~ | 12 | 0 | |||||
58 | ACO 1049 | ClG | 10 38 38 | +67 44.4 | ~ | 8 | 0 | |||||
59 | ACO 1061 | ClG | 10 40 47 | +67 12.3 | ~ | 12 | 0 | |||||
60 | ACO 3471 | ClG | 11 11 13 | -30 09.3 | ~ | 5 | 0 | |||||
61 | ACO 1190 | ClG | 11 11 43.83 | +40 51 43.5 | ~ | 131 | 0 | |||||
62 | ACO 1186 | ClG | 11 13 51 | +75 23.7 | ~ | 30 | 0 | |||||
63 | ACO 1234 | ClG | 11 22 30.000 | +21 24 22.00 | ~ | 38 | 0 | |||||
64 | ACO 1240 | ClG | 11 23 37.7 | +43 03 28 | ~ | 98 | 0 | |||||
65 | ACO 1259 | ClG | 11 26 10 | +05 15.5 | ~ | 5 | 0 | |||||
66 | ACO 1302 | ClG | 11 33 12.02 | +66 22 26.9 | ~ | 73 | 0 | |||||
67 | ACO 1351 | ClG | 11 42 24.7795 | +58 32 05.558 | ~ | 79 | 0 | |||||
68 | ACO 1367 | ClG | 11 44 44.6 | +19 41 59 | ~ | 1078 | 1 | |||||
69 | ACO 1381 | ClG | 11 48 30 | +75 13.3 | ~ | 16 | 0 | |||||
70 | ACO 1401 | ClG | 11 51 54.51 | +37 15 48.4 | ~ | 29 | 0 | |||||
71 | ACO 1413 | ClG | 11 55 12.87 | +23 23 46.9 | ~ | 430 | 0 | |||||
72 | ACO 1446 | ClG | 12 01 54.77 | +58 01 40.7 | ~ | 100 | 1 | |||||
73 | ACO 1455 | ClG | 12 04 04.0 | +28 07 08 | ~ | 56 | 0 | |||||
74 | ACO 1469 | ClG | 12 05 45 | -07 06.7 | ~ | 10 | 0 | |||||
75 | ACO 1470 | ClG | 12 06 52 | +71 38.3 | ~ | 17 | 0 | |||||
76 | ACO 1504 | ClG | 12 15 19 | +27 31.3 | ~ | 12 | 0 | |||||
77 | ACO 1510 | ClG | 12 16 31 | +27 11.3 | ~ | 6 | 0 | |||||
78 | ACO 1515 | ClG | 12 18 43 | +27 58.3 | ~ | 8 | 0 | |||||
79 | ACO 1539 | ClG | 12 26 09.67 | +62 32 52.9 | ~ | 25 | 0 | |||||
80 | ACO 1546 | ClG | 12 27 59 | +64 36.4 | ~ | 13 | 0 | |||||
81 | ACO 1550 | ClG | 12 29 02.5 | +47 37 20 | ~ | 46 | 0 | |||||
82 | ACO 1557 | ClG | 12 32 33 | +62 50.5 | ~ | 9 | 0 | |||||
83 | ACO 1560 | ClG | 12 33 58.4 | +15 11 30 | ~ | 22 | 0 | |||||
84 | ACO 1565 | ClG | 12 35 06.4 | +41 17 44 | ~ | 12 | 0 | |||||
85 | ACO 1566 | ClG | 12 35 12.60 | +64 22 41.3 | ~ | 26 | 0 | |||||
86 | ACO 1576 | ClG | 12 36 59.5 | +63 11 18 | ~ | 108 | 0 | |||||
87 | ACO 1607 | ClG | 12 42 44 | +76 08.6 | ~ | 19 | 1 | |||||
88 | ACO 1636 | ClG | 12 53 04.7 | +62 48 10 | ~ | 18 | 0 | |||||
89 | ACO 1656 | ClG | 12 59 44.40 | +27 54 44.9 | ~ | 4809 | 2 | |||||
90 | ACO 1664 | ClG | 13 03 42.4 | -24 14 44 | ~ | 127 | 0 | |||||
91 | ACO 1689 | ClG | 13 11 29.5 | -01 20 28 | ~ | 1125 | 0 | |||||
92 | NAME NGC 5044 Group | GrG | 13 14 22.7 | -16 32 04 | ~ | 181 | 0 | |||||
93 | ACO 1706 | ClG | 13 16 20 | +41 23.2 | ~ | 10 | 0 | |||||
94 | ACO 3558 | ClG | 13 27 54.8 | -31 29 32 | ~ | 443 | 2 | |||||
95 | ACO 3559 | ClG | 13 29 53.9 | -29 31 29 | ~ | 69 | 0 | |||||
96 | ACO 3560 | ClG | 13 32 23.7 | -33 08 21 | ~ | 134 | 1 | |||||
97 | ACO 1758 | ClG | 13 32 32.1 | +50 30 37 | ~ | 252 | 2 | |||||
98 | NAME ACO 1758S | GrG | 13 32 32.8 | +50 24 48 | ~ | 64 | 0 | |||||
99 | MCXC J1332.7+5032 | ClG | 13 32 44.8 | +50 32 24 | ~ | 107 | 0 | |||||
100 | ACO 3562 | ClG | 13 33 31.8 | -31 40 23 | ~ | 314 | 1 | |||||
101 | ACO 1763 | ClG | 13 35 20.1 | +41 00 04 | ~ | 312 | 0 | |||||
102 | ACO 3566 | ClG | 13 38 59 | -35 33.2 | ~ | 44 | 0 | |||||
103 | ACO 1775 | ClG | 13 41 50.60 | +26 21 10.6 | ~ | 304 | 0 | |||||
104 | ACO 3571 | ClG | 13 47 28.9 | -32 51 57 | ~ | 285 | 2 | |||||
105 | ACO 1795 | ClG | 13 48 50.48 | +26 35 07.4 | ~ | 1268 | 0 | |||||
106 | ACO 3576 | ClG | 13 52 45 | -30 17.8 | ~ | 8 | 0 | |||||
107 | ACO 1838 | ClG | 14 00 16 | +41 03.5 | ~ | 9 | 0 | |||||
108 | ACO 1904 | ClG | 14 22 13.21 | +48 35 59.7 | ~ | 134 | 0 | |||||
109 | ACO 1914 | ClG | 14 26 03.32 | +37 49 58.7 | ~ | 314 | 0 | |||||
110 | ACO 1937 | ClG | 14 34 26 | +58 15.9 | ~ | 18 | 0 | |||||
111 | ACO 1940 | ClG | 14 35 30.56 | +55 09 33.9 | ~ | 92 | 0 | |||||
112 | ACO 2008 | ClG | 15 00 01 | +23 08.1 | ~ | 15 | 0 | |||||
113 | ACO 2034 | ClG | 15 10 12.96 | +33 29 53.2 | ~ | 215 | 1 | |||||
114 | ACO 2029 | ClG | 15 10 56.2 | +05 44 42 | ~ | 943 | 0 | |||||
115 | ACO 2111 | ClG | 15 39 40.9 | +34 25 04 | ~ | 180 | 0 | |||||
116 | ACO 2125 | ClG | 15 41 14.1 | +66 15 57 | ~ | 122 | 1 | |||||
117 | ACO 2142 | ClG | 15 58 14.38 | +27 12 57.8 | ~ | 769 | 0 | |||||
118 | ACO 2151 | ClG | 16 05 15.0 | +17 44 55 | ~ | 578 | 3 | |||||
119 | ACO 2163 | ClG | 16 15 46.1 | -06 08 50 | ~ | 563 | 0 | |||||
120 | ACO 2201 | ClG | 16 27 00.1 | +55 28 18 | ~ | 36 | 0 | |||||
121 | ACO 2198 | ClG | 16 28 04 | +43 49.4 | ~ | 31 | 0 | |||||
122 | ACO 2199 | ClG | 16 28 43.31 | +39 34 07.6 | ~ | 1172 | 1 | |||||
123 | ACO 2204 | ClG | 16 32 45.7 | +05 34 43 | ~ | 436 | 0 | |||||
124 | ACO 2218 | ClG | 16 35 54.0 | +66 13 00 | ~ | 809 | 1 | |||||
125 | ACO 2219 | ClG | 16 40 22.1 | +46 42 20 | ~ | 359 | 0 | |||||
126 | ACO 2246 | ClG | 17 00 41.94 | +64 13 16.9 | ~ | 50 | 0 | |||||
127 | ACO 2244 | ClG | 17 02 40.33 | +34 02 58.7 | ~ | 281 | 0 | |||||
128 | ACO 2256 | ClG | 17 03 09.4 | +78 39 36 | ~ | 885 | 1 | |||||
129 | ACO 2255 | ClG | 17 12 50.04 | +64 03 10.6 | ~ | 568 | 0 | |||||
130 | ACO 2291 | ClG | 17 56 52 | +51 08.7 | ~ | 8 | 0 | |||||
131 | ACO 2302 | ClG | 18 19 57.6 | +57 09 58 | ~ | 28 | 0 | |||||
132 | ACO 2316 | ClG | 18 55 20 | +80 02.1 | ~ | 12 | 0 | |||||
133 | ACO 2317 | ClG | 19 08 20.500 | +69 03 20.00 | ~ | 42 | 0 | |||||
134 | ACO 3667 | ClG | 20 12 33.68 | -56 50 26.3 | ~ | 628 | 1 | |||||
135 | ACO 3735 | ClG | 21 02 58 | -42 23.1 | ~ | 3 | 0 | |||||
136 | ACO 2355 | ClG | 21 35 18.70 | +01 25 27.0 | ~ | 63 | 0 | |||||
137 | ACO 2356 | ClG | 21 35 45.13 | +00 11 21.1 | ~ | 46 | 0 | |||||
138 | ACO 2354 | ClG | 21 35 50 | -14 54.6 | ~ | 17 | 0 | |||||
139 | ACO 2387 | ClG | 21 38 39 | +83 06.7 | ~ | 11 | 0 | |||||
140 | ACO 3818 | ClG | 21 51 25 | -48 02.9 | ~ | 8 | 0 | |||||
141 | ACO 2397 | ClG | 21 56 08.50 | +01 23 27.3 | ~ | 56 | 0 | |||||
142 | ACO 3829 | ClG | 22 02 45 | -41 38.5 | ~ | 3 | 0 | |||||
143 | ACO 3888 | ClG | 22 34 23.0 | -37 43 29 | ~ | 138 | 1 | |||||
144 | ACO 3921 | ClG | 22 49 59.0 | -64 25 48 | ~ | 150 | 1 | |||||
145 | ACO 2507 | ClG | 22 57 06.1 | +05 33 49 | ~ | 37 | 0 | |||||
146 | ACO 4038 | ClG | 23 47 31.1 | -28 12 10 | ~ | 335 | 3 | |||||
147 | ACO 2670 | ClG | 23 54 10.51 | -10 23 06.8 | ~ | 352 | 0 |
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