2008ApJ...682..821C

Query : 2008ApJ...682..821C

2008ApJ...682..821C - Astrophys. J., 682, 821-834 (2008/August-1)

Bandpass dependence of X-ray temperatures in galaxy clusters.

CAVAGNOLO K.W., DONAHUE M., VOIT G.M. and SUN M.

Abstract (from CDS):

We explore the band dependence of the inferred X-ray temperature of the intracluster medium (ICM) for 192 well-observed galaxy clusters selected from the Chandra Data Archive. If the hot ICM is nearly isothermal in the projected region of interest, the X-ray temperature inferred from a broadband (0.7-7.0 keV) spectrum should be identical to the X-ray temperature inferred from a hard-band (2.0-7.0 keV) spectrum. However, if unresolved cool lumps of gas are contributing soft X-ray emission, the temperature of a best-fit single-component thermal model will be cooler for the broadband spectrum than for the hard-band spectrum. Using this difference as a diagnostic, the ratio of best-fitting hard-band and broadband temperatures may indicate the presence of cooler gas even when the X-ray spectrum itself may not have sufficient signal-to-noise ratio (S/N) to resolve multiple temperature components. To test this possible diagnostic, we extract X-ray spectra from core-excised annular regions for each cluster in our archival sample. We compare the X-ray temperatures inferred from single-temperature fits when the energy range of the fit is 0.7-7.0 keV (broad) and when the energy range is 2.0/1+z-7.0 keV (hard). We find that the hard-band temperature is significantly higher, on average, than the broadband temperature. On further exploration, we find this temperature ratio is enhanced preferentially for clusters which are known merging systems. In addition, cool-core clusters tend to have best-fit hard-band temperatures that are in closer agreement with their best-fit broadband temperatures. We show, using simulated spectra, that this diagnostic is sensitive to secondary cool components (TX=0.5-3.0 keV) with emission measures ≥10-30% of the primary hot component.

Abstract Copyright: ∼

Journal keyword(s): Catalogs - Cosmology: Observations - Galaxies: Clusters: General - Methods: Data Analysis - X-Rays: Galaxies: Clusters

VizieR on-line data: <Available at CDS (J/ApJ/682/821): table1.dat table2.dat table3.dat>

CDS comments: Table 1: V 1121.0+2327 is [VMF98] 100; MS 0016.9+1609 is 1E 0015.9+1609.

Simbad objects: 208

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Number of rows : 208
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 ACO 2717 ClG 00 03 12.9 -35 56 13           ~ 146 0
2 ClG J0011-2850 ClG 00 11 21.623 -28 51 14.44           ~ 7 0
3 ACT-CL J0011.7-1523 ClG 00 11 42.9 -15 23 22           ~ 39 0
4 ACO 13 ClG 00 13 38.5 -19 30 19           ~ 107 1
5 ACO 2744 ClG 00 14 20.03 -30 23 17.8           ~ 1077 0
6 ClG 0016+16 ClG 00 18 33.3 +16 26 36           ~ 517 0
7 MCS J0025.4-1222 ClG 00 25 29.381 -12 22 37.06           ~ 151 0
8 ZwCl 0024+1652 ClG 00 26 35.6 +17 09 32     18.35     ~ 648 1
9 ClG J0030+2618 ClG 00 30 33.6 +26 18 16           ~ 65 0
10 ACT-CL J0035.4-2015 ClG 00 35 26.5 -20 15 46           ~ 52 0
11 ACO 68 ClG 00 37 06.2 +09 09 33           ~ 195 0
12 3C 28 rG 00 55 50.583 +26 24 36.68   18.63 19.57 16.26   ~ 213 1
13 BAX 013.9612+26.4117 ClG 00 55 50.9 +26 24 35           ~ 29 0
14 ACO 119 ClG 00 56 08.57 -01 12 00.8           ~ 577 2
15 MCS J0111.5+0855 ClG 01 11 31.4 +08 55 41           ~ 15 0
16 ACO 168 ClG 01 15 07.58 +00 19 10.8           ~ 379 2
17 ACO 209 ClG 01 31 52.9 -13 36 53           ~ 326 0
18 ACT-CL J0152.5-2853 ClG 01 52 32.8 -28 53 32           ~ 34 0
19 ClG J0152-1358 ClG 01 52 41.3 -13 58 13           ~ 262 3
20 ACO 267 ClG 01 52 43.016 +00 59 58.90           ~ 241 0
21 ACT-CL J0159.0-3413 ClG 01 59 00.3 -34 13 00           ~ 33 0
22 ACT-CL J0159.8-0849 ClG 01 59 49.4 -08 50 00           ~ 98 0
23 ACT-CL J0232.2-4421 ClG 02 32 18.69 -44 20 41.5           ~ 130 0
24 ACO 370 ClG 02 39 50.5 -01 35 08           ~ 825 0
25 ClG J0242-2132 ClG 02 42 35.9 -21 32 26           ~ 55 0
26 ACO 383 ClG 02 48 03.3915 -03 31 45.228           ~ 389 0
27 ACT-CL J0257.1-2325 ClG 02 57 09.151 -23 26 05.83           ~ 80 0
28 ACO 402 ClG 02 57 41.33 -22 09 14.4           ~ 62 0
29 ACO 399 ClG 02 57 56.4 +13 00 59           ~ 420 0
30 ACO 401 ClG 02 58 50.3 +13 34 07           ~ 592 0
31 ClG 0303+1658 ClG 03 05 31.6 +17 10 02     20.13     ~ 92 0
32 MCS J0308.9+2645 ClG 03 08 55.9 +26 45 38           ~ 48 0
33 ClG J0311-2655 ClG 03 11 33.904 -26 54 16.48           ~ 2 0
34 RX J0329.6-0211 ClG 03 29 41.6 -02 11 47           ~ 155 0
35 ACO 3128 ClG 03 29 50.6 -52 34 48           ~ 183 3
36 RX J0340.7-4542 ClG 03 40 44.7 -45 41 18           ~ 1 0
37 ACO 3158 ClG 03 43 07.5 -53 38 09           ~ 327 0
38 ACO 3164 ClG 03 46 16.8 -57 02 11           ~ 47 0
39 ACT-CL J0404.6+1108 ClG 04 04 37.4 +11 09 57           ~ 36 0
40 ACO 478 ClG 04 13 24.8 +10 27 52           ~ 522 0
41 ACT-CL J0417.5-1154 ClG 04 17 34.6 -11 54 32           ~ 116 0
42 ClG 0422-09 ClG 04 25 51.02 -08 33 38.5           ~ 97 0
43 ACO S 463 ClG 04 29 13.4 -53 44 02           ~ 50 0
44 ClG J0429-0253 ClG 04 29 36.0 -02 53 09           ~ 131 0
45 ACT-CL J0438.9+0716 ClG 04 39 00.7 +07 15 45           ~ 62 0
46 BAX 069.7593+05.3453 ClG 04 39 02.2 +05 20 43           ~ 82 0
47 ClG 0440+02 ClG 04 43 09.7 +02 10 19     17.03     ~ 129 0
48 ACO 514 ClG 04 48 18 -20 28.7           ~ 149 0
49 ClG J0451+0006 ClG 04 51 54.6 +00 06 19           ~ 57 0
50 ACO 521 ClG 04 54 08.6 -10 14 39           ~ 279 0
51 ACO 520 ClG 04 54 10.1 +02 55 38           ~ 465 0
52 ClG 0451-03 ClG 04 54 10.9 -03 01 07     20.0     ~ 368 0
53 MCS J0455.2+0657 ClG 04 55 17.4 +06 57 47           ~ 11 0
54 ACO 3330 ClG 05 14 47.4 -49 04 19           ~ 36 2
55 ACT-CL J0520.7-1328 ClG 05 20 42.0 -13 28 49           ~ 39 0
56 ACT-CL J0528.8-3927 ClG 05 28 56.2 -39 27 49           ~ 78 0
57 ClG J0542-4100 ClG 05 42 49.9 -40 59 58           ~ 67 0
58 ACT-CL J0546.9-3904 ClG 05 47 01.5 -39 04 28           ~ 37 0
59 ACT-CL J0553.4-3342 ClG 05 53 27.200 -33 42 53.02           ~ 74 0
60 ACO 3376 ClG 06 01 25.000 -39 59 51.00           ~ 334 0
61 ACO 3391 ClG 06 26 15.4 -53 40 52           ~ 222 1
62 ClG J0647+7015 ClG 06 47 50.0 +70 14 55           ~ 177 0
63 ClG 0657-56 ClG 06 58 26.9 -55 58 21           ~ 1077 1
64 ClG J0717+3745 ClG 07 17 36.50 +37 45 23.0           ~ 511 0
65 B3 0714+378 Rad 07 17 36.6 +37 45 01           ~ 170 2
66 ACO 586 ClG 07 32 20.3 +31 37 58           ~ 196 0
67 ZwCl 0735+7421 ClG 07 41 40.3 +74 14 58     17.70     ~ 273 0
68 ClG J0744+3927 ClG 07 44 52.5 +39 27 30           ~ 189 0
69 PKS 0745-19 rG 07 47 31.3247085936 -19 17 40.013334276   19.60       ~ 422 1
70 ClG 0745-1910 ClG 07 47 32.4 -19 18 23           ~ 378 0
71 ACO 611 ClG 08 00 58.7 +36 02 49           ~ 275 0
72 ACO 644 ClG 08 17 26.1 -07 31 13           ~ 241 0
73 BAX 124.9136+63.6101 ClG 08 19 26.0 +63 37 26           ~ 21 0
74 ACO 665 ClG 08 30 45.2 +65 52 55           ~ 457 0
75 ClG J0834+5534 ClG 08 34 54.9 +55 34 21           ~ 26 0
76 ZwCl 0839+2937 ClG 08 42 55.9 +29 27 26     17.0     ~ 93 0
77 ACO 697 ClG 08 42 57.6 +36 21 45           ~ 277 0
78 ClG J0848+4456 ClG 08 48 46.9 +44 56 22           ~ 62 1
79 ClG J0849+4452 ClG 08 48 58.8 +44 51 53           ~ 107 1
80 ZwCl 0847+3617 ClG 08 50 12.0 +36 03 36           ~ 75 0
81 ZwCl 0848+3341 ClG 08 51 39.00 +33 31 08.0           ~ 24 0
82 ClG 0906.5+1110 ClG 09 09 12.7 +10 58 32           ~ 108 0
83 ClG J0910+5422 ClG 09 10 44.9 +54 22 09           ~ 94 0
84 ACT-CL J0911.1+1746 ClG 09 11 11.277 +17 46 31.94           ~ 79 0
85 IRAS 09104+4109 Sy2 09 13 45.4951283928 +40 56 28.215343572   19.69 19.21     ~ 260 1
86 RXC J0913.7+4056 ClG 09 13 46.0 +40 56 20           ~ 71 0
87 ACO 773 ClG 09 17 51.3 +51 43 20           ~ 308 0
88 ACO 781 ClG 09 20 25.4 +30 30 07           ~ 167 0
89 ClG J0932+7906 ClG 09 32 39.6 +79 06 32           ~ 7 0
90 ClG J0947+7623 ClG 09 46 59.916 +76 23 43.99           ~ 165 0
91 NVSS J094712+762312 Rad 09 47 12.37 +76 23 09.3           ~ 151 1
92 ZwCl 0947+1723 ClG 09 49 51.8 +17 07 05           ~ 92 0
93 ZwCl 0949+5207 ClG 09 52 49.1 +51 53 05           ~ 141 0
94 ACO 907 ClG 09 58 21.84 -11 03 47.5           ~ 137 0
95 MCS J1006.9+3200 ClG 10 06 55.7 +31 59 34           ~ 23 0
96 ZwCl 1006+1201 ClG 10 08 47.1 +11 47 55     18.0     ~ 75 0
97 ClG 1008-12 ClG 10 10 34.1 -12 39 48     18.0     ~ 155 0
98 ACO 963 ClG 10 17 03.4 +39 02 56           ~ 414 0
99 ZwCl 1021+0426 ClG 10 23 39.0 +04 11 14   15.6 17.95     ~ 297 0
100 ACO 1068 ClG 10 40 47.1 +39 57 19           ~ 232 0
101 ClG J1053+5735 ClG 10 53 43.4 +57 35 21           ~ 31 1
102 ClG 1054-03 ClG 10 57 00.2 -03 37 27     22     ~ 458 0
103 MCS J1105.7-1014 ClG 11 05 46.4 -10 14 37           ~ 9 0
104 ACT-CL J1108.9+0906 ClG 11 08 55.3 +09 06 01           ~ 23 0
105 ACO 1201 ClG 11 12 54.4 +13 26 08           ~ 131 1
106 ClG J1113-2615 ClG 11 13 05.7 -26 15 36           ~ 37 0
107 ACO 1204 ClG 11 13 32.2 +17 35 40           ~ 101 0
108 ClG J1115+5319 ClG 11 15 14.8 +53 19 54           ~ 56 0
109 MCS J1115.8+0129 ClG 11 15 52.1 +01 29 53           ~ 142 0
110 ClG J1120+2326 ClG 11 20 57.9 +23 26 41           ~ 42 0
111 ACO 1300 ClG 11 32 00.7 -19 53 34           ~ 168 0
112 ACO 1361 ClG 11 43 45.85 +46 20 51.8           ~ 96 0
113 MCS J1149.5+2223 ClG 11 49 35.8 +22 23 55           ~ 546 0
114 ACO 1423 ClG 11 57 17.3206 +33 36 39.364           ~ 181 0
115 ClG J1159+5531 ClG 11 59 53.02 +55 32 22.8     15.64     ~ 100 1
116 MCS J1206.2-0847 ClG 12 06 12.2 -08 48 02           ~ 286 0
117 ClG J1213+0253 ClG 12 13 34.4 +02 53 57           ~ 34 0
118 ZwCl 1215+0400 ClG 12 17 43.62 +03 38 51.5           ~ 169 0
119 ClG J1221+4918 ClG 12 21 25.0 +49 18 07           ~ 60 0
120 MCS J1226.8+2153 ClG 12 26 51.69 +21 52 25.4           ~ 33 0
121 ClG J1226+3332 ClG 12 26 57.7 +33 32 50           ~ 228 0
122 ZwCl 1231+1007 ClG 12 34 21.9 +09 47 02           ~ 72 0
123 ClG J1252-2927 ClG 12 52 54.4 -29 27 17           ~ 158 0
124 ACO 1651 ClG 12 59 27.3 -04 10 49           ~ 307 0
125 ACO 1664 ClG 13 03 42.4 -24 14 44           ~ 136 0
126 ACO 1682 ClG 13 06 49.7 +46 32 59           ~ 149 1
127 ClG J1311-0311 ClG 13 11 01.7 -03 10 38           ~ 120 0
128 ACO 1689 ClG 13 11 29.5 -01 20 28           ~ 1178 0
129 ACO 1722 ClG 13 20 08.3 +70 04 33           ~ 63 0
130 ACO 1758 ClG 13 32 32.1 +50 30 37           ~ 266 2
131 ZwCl 1332+5043 ClG 13 34 20.0 +50 30 54           ~ 42 0
132 ACO 1763 ClG 13 35 20.1 +41 00 04           ~ 335 0
133 ClG J1347-1145 ClG 13 47 30.5 -11 45 07           ~ 577 0
134 ACO 1795 ClG 13 48 47.4 +26 34 55           ~ 1330 0
135 ClG J1350+6007 ClG 13 50 48.55 +60 07 06.7           ~ 46 0
136 ZwCl 1358+6245 ClG 13 59 54.3 +62 30 36     18.5     ~ 370 0
137 ACO 1835 ClG 14 01 02.07 +02 52 43.2           ~ 727 1
138 ClG J1411+5211 ClG 14 11 24.4 +52 12 38     20.11     ~ 122 3
139 ClG J1423+2404 ClG 14 23 47.7 +24 04 40           ~ 231 0
140 ACO 1914 ClG 14 25 57.4 +37 49 54           ~ 338 0
141 MCS J1427.3+4408 ClG 14 27 16.2 +44 07 31           ~ 34 0
142 MCS J1427.6-2521 ClG 14 27 39.4 -25 21 02           ~ 27 0
143 ACO 1942 ClG 14 38 21.8673 +03 40 13.247           ~ 122 0
144 ACO 1995 ClG 14 52 55.0 +58 02 59           ~ 140 0
145 ZwCl 1455+2232 ClG 14 57 15.2 +22 20 30     18.62 20.04   ~ 309 0
146 ClG J1504-0248 ClG 15 04 07.4 -02 48 15           ~ 186 0
147 ACO 2034 ClG 15 10 03.9 +33 30 57           ~ 248 1
148 ACO 2029 ClG 15 10 54.2 +05 44 23           ~ 1020 0
149 ACT-CL J1521.8+0742 ClG 15 21 48.8 +07 43 41     15.13     ~ 326 0
150 ACO 2065 ClG 15 22 22.7 +27 44 20           ~ 398 0
151 ACO 2069 ClG 15 24 02.92 +29 53 20.3           ~ 165 0
152 ClG J1524+0957 ClG 15 24 40.3 +09 57 35           ~ 64 0
153 ClG J1532+3021 ClG 15 32 53.8 +30 21 00           ~ 122 0
154 ACO 2111 ClG 15 39 40.9 +34 25 04           ~ 188 0
155 ACO 2125 ClG 15 41 14.1 +66 15 57           ~ 124 1
156 ACO 2163 ClG 16 15 46.1 -06 08 50           ~ 586 0
157 ClG J1621+3810 ClG 16 21 25.5 +38 09 43           ~ 83 0
158 ClG 1621+26 ClG 16 23 35.7 +26 33 50           ~ 145 0
159 ACO 2204 ClG 16 32 47.7 +05 34 18           ~ 457 0
160 ACO 2218 ClG 16 35 54.0 +66 13 00           ~ 827 1
161 BAX 249.5848-64.5165 ClG 16 38 13.2 -64 21 21           ~ 123 0
162 ACO 2219 ClG 16 40 22.1 +46 42 20           ~ 381 0
163 ClG J1641+4001 ClG 16 41 52.3 +40 01 29           ~ 43 0
164 BAX 252.7839+04.9926 ClG 16 51 08.2 +04 59 34           ~ 50 0
165 ACO 2256 ClG 17 03 37.5 +78 37 23           ~ 928 1
166 ACO 2255 ClG 17 12 56.0 +64 04 06           ~ 605 0
167 NGC 6338 Bla 17 15 22.9842192344 +57 24 40.346559927   14.2   8   ~ 205 2
168 NAME NGC 6338 Group GrG 17 15 32.47 +57 25 19.0           ~ 95 0
169 ClG J1716+6708 ClG 17 16 49.6 +67 08 30           ~ 137 0
170 ACO 2259 ClG 17 20 09.2 +27 40 09           ~ 131 0
171 ClG J1720+2638 ClG 17 20 09.6 +26 37 35           ~ 284 0
172 ClG J1720+3536 ClG 17 20 16.8 +35 36 27           ~ 150 1
173 ACO 2261 ClG 17 22 26.9 +32 07 58           ~ 370 0
174 ACO 2294 ClG 17 24 10.1 +85 53 09           ~ 69 0
175 MCS J1731.6+2252 ClG 17 31 39.2 +22 51 50           ~ 48 0
176 MCS J1824.3+4309 ClG 18 24 19.0 +43 09 49           ~ 19 0
177 RXC J1844.0+4533 ClG 18 44 01.8 +45 33 24           ~ 28 0
178 3C 388.0 SyG 18 44 02.3840387736 +45 33 29.628672300   16.91 15.56     ~ 338 1
179 ClG J1931-2635 ClG 19 31 49.6 -26 34 33           ~ 181 0
180 ACT-CL J2011.4-5724 ClG 20 11 26.8 -57 25 09           ~ 48 0
181 ACT-CL J2046.0-3430 ClG 20 46 00.1 -34 30 12           ~ 24 0
182 ACT-CL J2049.9-3217 ClG 20 49 56.2 -32 16 52           ~ 22 0
183 ClG 2053-04 ClG 20 56 21.2 -04 37 46   21.0       ~ 168 0
184 ClG J2129-0741 ClG 21 29 26.0 -07 41 28           ~ 189 0
185 ClG J2129+0005 ClG 21 29 40.5 +00 05 47           ~ 308 0
186 ClG 2137-2353 ClG 21 40 12.8 -23 39 27     18.5     ~ 390 0
187 ACO 2384 ClG 21 52 20.9 -19 32 53           ~ 117 0
188 ACO 2390 ClG 21 53 37.4 +17 41 46           ~ 732 2
189 ACO 2409 ClG 22 00 52.7 +20 58 27           ~ 101 0
190 ACT-CL J2211.7-0349 ClG 22 11 44.8 -03 49 33           ~ 96 0
191 ACT-CL J2214.9-1359 ClG 22 14 57.3 -14 00 12           ~ 100 0
192 NAME 2PIGG J2227.0-3041 GrG 22 27 54.560 -30 34 34.84           ~ 6 0
193 BAX 337.1433+20.6131 ClG 22 28 32.6 +20 37 08           ~ 132 0
194 ClG J2229-2756 ClG 22 29 45.36 -27 55 36.5           ~ 50 0
195 ClG J2243-0935 ClG 22 43 21.1 -09 35 43           ~ 96 0
196 MCS J2245.0+2637 ClG 22 45 04.5 +26 38 07           ~ 40 0
197 ACO S 1063 ClG 22 48 45.4 -44 31 42           ~ 395 0
198 ACO 3921 ClG 22 49 59.0 -64 25 48           ~ 165 1
199 ACO S 1077 ClG 22 58 52.34 -34 46 54.6           ~ 198 0
200 ClG J2302+0844 ClG 23 02 48.1 +08 43 50           ~ 43 0
201 ACO 2537 ClG 23 08 22.3 -02 11 29           ~ 152 0
202 ACO 2552 ClG 23 11 31.7 +03 37 44           ~ 87 0
203 ACO 2550 ClG 23 11 33.5 -21 44 41           ~ 32 0
204 ACO 2554 ClG 23 12 18.7 -21 30 54           ~ 100 1
205 ACO 2556 ClG 23 13 03.3 -21 37 40           ~ 83 0
206 ACO 2631 ClG 23 37 40.7 +00 16 35           ~ 183 0
207 ACO 2667 ClG 23 51 39.37 -26 05 02.7           ~ 190 0
208 ACO 2670 ClG 23 54 10.51 -10 23 06.8           ~ 364 0

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