2025A&A...703A.306D

Query : 2025A&A...703A.306D

2025A&A...703A.306D - Astronomy and Astrophysics, volume 703A306 (2025/11-1)

The elliptical configuration of the X-ray-emitting intracluster medium.

DI TULLIO ZINN G.

Abstract (from CDS):

Context. The morphology of the hot gas X-ray images within galaxy clusters provides indications about the formation, populations, mergers, and evolution of clusters in connection with their dynamical state.
Aims. The aim of this investigation is to search for a link between one or more basic morphological parameters describing the elliptical configuration of intracluster medium (ICM) X-ray contours and the dynamical state of the parent cluster.
Methods. We used the 2021 X-CLASS Survey Catalogue of X-ray-detected galaxy clusters. We selected the sample of 982 spectroscopically confirmed clusters, and visually inspected the shape and orientation of their hot gas X-ray contours. We recognized a variety of morphological structures that could lead to a certain dynamical state. A more detailed analysis was carried out by fitting ellipses to the X-ray digitized contours of a subsample of 105 clusters, already classified in the literature as dynamically relaxed, dynamically non-relaxed, or dynamically intermediate.
Results. Some correlations have been found among our measurements of ellipticity (ϵ) for ICM X-ray contours and the classified dynamical state of the parent cluster. The majority of the relaxed clusters present an increase in ellipticity outward from the cluster center; exceptions include a conspicuous number of clusters with essentially ICM constant ellipticity. In contrast, most of the non-relaxed clusters have ellipticity profiles decreasing outward, with fewer exceptions. Moreover, the total variation in ellipticity (Δϵ) tends to be smaller for the X-ray contours of relaxed clusters than for those of non-relaxed clusters, including maximum ellipticity values. Intermediate clusters overlap with both groups. Similar results are found by applying the selected morphological parameters to ICM X-ray contours available in the literature from other X-ray observations.

Abstract Copyright: © The Authors 2025

Journal keyword(s): galaxies: clusters: intracluster medium

Simbad objects: 106

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Number of rows : 106
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 2697 ClG 00 03 11.5 -06 05 30           ~ 53 0
2 ACO 2744 ClG 00 14 20.03 -30 23 17.8           ~ 1077 0
3 ClG 0016+16 ClG 00 18 33.3 +16 26 36           ~ 517 0
4 ACO 68 ClG 00 37 06.2 +09 09 33           ~ 195 0
5 ACO 85 ClG 00 41 36.21 -09 19 30.4           ~ 974 0
6 ACO 2811 ClG 00 42 08.82 -28 32 08.8           ~ 78 0
7 ACO S 84 ClG 00 49 23.2 -29 31 33           ~ 89 0
8 ClG 0053-37 ClG 00 56 03.5 -37 32 43           ~ 29 0
9 ACO 133 ClG 01 02 41.5 -21 52 53           ~ 391 1
10 ACO 209 ClG 01 31 52.9 -13 36 53           ~ 326 0
11 ACO 291 ClG 02 01 42.9 -02 11 48           ~ 72 0
12 ACO 3038 ClG 02 38 01.2 -52 24 41           ~ 26 0
13 ClG J0242-2132 ClG 02 42 35.9 -21 32 26           ~ 55 0
14 ACO S 295 ClG 02 45 35.80 -53 02 16.8           ~ 86 0
15 ACO 383 ClG 02 48 03.3915 -03 31 45.228           ~ 389 0
16 ACO 3112 ClG 03 17 52.9 -44 15 06           ~ 329 1
17 MCXC J0327.9+0233 ClG 03 27 54.5 +02 33 47           ~ 10 0
18 ACO 478 ClG 04 13 24.8 +10 27 52           ~ 522 0
19 ACO 496 ClG 04 33 40.8 -13 14 34           ~ 728 2
20 ACO 3292 ClG 04 49 54 -44 40.3           ~ 44 0
21 ACO 521 ClG 04 54 08.6 -10 14 39           ~ 279 0
22 ClG 0451-03 ClG 04 54 10.9 -03 01 07     20.0     ~ 368 0
23 ACO 3343 ClG 05 25 49.1 -47 14 58           ~ 37 0
24 ACO S 540 ClG 05 40 06.2 -40 50 29           ~ 60 0
25 ACO 3364 ClG 05 47 38.1 -31 52 15           ~ 86 0
26 ACT-CL J0559.7-5249 ClG 05 59 43.20 -52 49 27.1           ~ 63 0
27 ACO S 579 ClG 06 16 32.5 -39 48 04           ~ 30 0
28 ACO 3395 ClG 06 27 31.1 -54 23 58           ~ 229 0
29 ACO S 592 ClG 06 38 49.40 -53 58 40.8           ~ 75 0
30 ClG 0657-56 ClG 06 58 26.9 -55 58 21           ~ 1077 1
31 ClG J0717+3745 ClG 07 17 36.50 +37 45 23.0           ~ 511 0
32 ACO 586 ClG 07 32 20.3 +31 37 58           ~ 196 0
33 ClG J0744+3927 ClG 07 44 52.5 +39 27 30           ~ 189 0
34 ACO 611 ClG 08 00 58.7 +36 02 49           ~ 275 0
35 ACO 697 ClG 08 42 57.6 +36 21 45           ~ 277 0
36 ZwCl 0857+2107 ClG 09 00 36.90 +20 53 40.3           ~ 103 0
37 ACO 754 ClG 09 09 14.8 -09 40 35           ~ 695 1
38 RXC J0913.7+4056 ClG 09 13 46.0 +40 56 20           ~ 71 0
39 ACO 773 ClG 09 17 51.3 +51 43 20           ~ 308 0
40 ClG 0915.7-1153 ClG 09 18 06.0 -12 05 45           ~ 16 0
41 ClG J0947+7623 ClG 09 46 59.916 +76 23 43.99           ~ 165 0
42 NAME ACO 901B ClG 09 55 57.4 -09 59 03           ~ 23 0
43 ACO 907 ClG 09 58 21.84 -11 03 47.5           ~ 137 0
44 ACO 963 ClG 10 17 03.4 +39 02 56           ~ 414 0
45 ZwCl 1021+0426 ClG 10 23 39.0 +04 11 14   15.6 17.95     ~ 297 0
46 ACO 1068 ClG 10 40 47.1 +39 57 19           ~ 232 0
47 ACO 1201 ClG 11 12 54.4 +13 26 08           ~ 131 1
48 ZwCl 1113+0144 ClG 11 15 54.0 +01 29 44           ~ 42 0
49 ClG J1120+4318 ClG 11 20 07.6 +43 18 07           ~ 65 0
50 MCS J1149.5+2223 ClG 11 49 35.8 +22 23 55           ~ 546 0
51 ACO 1413 ClG 11 55 12.87 +23 23 46.9           ~ 456 0
52 ClG J1159+5531 ClG 11 59 53.02 +55 32 22.8     15.64     ~ 100 1
53 MCS J1206.2-0847 ClG 12 06 12.2 -08 48 02           ~ 286 0
54 BAX 181.6396-07.7411 ClG 12 06 33.5 -07 44 24           ~ 19 0
55 ACO 1689 ClG 13 11 29.5 -01 20 28           ~ 1178 0
56 ACO 3558 ClG 13 28 03.2 -31 31 35           ~ 476 2
57 ACO 1775 ClG 13 41 50.60 +26 21 10.6           ~ 324 0
58 ClG J1347-1145 ClG 13 47 30.5 -11 45 07           ~ 577 0
59 ACO 1795 ClG 13 48 47.4 +26 34 55           ~ 1330 0
60 ClG J1354-0221 ClG 13 54 17.00 -02 22 13.1           ~ 52 0
61 ACO 1835 ClG 14 01 02.07 +02 52 43.2           ~ 727 1
62 ClG J1415+3611 ClG 14 15 11.1 +36 12 03           ~ 85 1
63 ClG J1423+2404 ClG 14 23 47.7 +24 04 40           ~ 231 0
64 ACO 1914 ClG 14 25 57.4 +37 49 54           ~ 338 0
65 ZwCl 1455+2232 ClG 14 57 15.2 +22 20 30     18.62 20.04   ~ 309 0
66 eMACS J1508.1+5755 ClG 15 08 21.9 +57 55 15           ~ 30 0
67 ACO 2034 ClG 15 10 03.9 +33 30 57           ~ 248 1
68 ACO 2029 ClG 15 10 54.2 +05 44 23           ~ 1020 0
69 ACO 2052 ClG 15 16 41.64 +07 01 45.5           ~ 756 1
70 ClG J1532+3021 ClG 15 32 53.8 +30 21 00           ~ 122 0
71 MCXC J1558.3-1410 ClG 15 58 22.0 -14 09 59           ~ 44 0
72 ACO 2163 ClG 16 15 46.1 -06 08 50           ~ 586 0
73 ACO 2199 ClG 16 28 34.5 +39 32 26           ~ 1206 1
74 ACO 2204 ClG 16 32 47.7 +05 34 18           ~ 457 0
75 ACO 2218 ClG 16 35 54.0 +66 13 00           ~ 827 1
76 ACO 2219 ClG 16 40 22.1 +46 42 20           ~ 381 0
77 XCLASS 1019 ClG 16 41 42.28 +39 07 36.6           ~ 4 0
78 BAX 252.7839+04.9926 ClG 16 51 08.2 +04 59 34           ~ 50 0
79 ClG J1701+6414 ClG 17 01 22.6 +64 14 09           ~ 78 0
80 ClG J1720+2638 ClG 17 20 09.6 +26 37 35           ~ 284 0
81 ClG J1720+3536 ClG 17 20 16.8 +35 36 27           ~ 150 1
82 ACO 2261 ClG 17 22 26.9 +32 07 58           ~ 370 0
83 ClG J1931-2635 ClG 19 31 49.6 -26 34 33           ~ 181 0
84 ACT-CL J2014.8-2430 ClG 20 14 49.7 -24 30 30           ~ 93 0
85 ACT-CL J2106.0-5844 ClG 21 06 04.3 -58 44 32           ~ 103 0
86 ClG J2129-0741 ClG 21 29 26.0 -07 41 28           ~ 189 0
87 ClG J2129+0005 ClG 21 29 40.5 +00 05 47           ~ 308 0
88 ClG 2137-2353 ClG 21 40 12.8 -23 39 27     18.5     ~ 390 0
89 ACT-CL J2146.5-4633 ClG 21 46 34.8 -46 32 56           ~ 36 0
90 ACO 2390 ClG 21 53 37.4 +17 41 46           ~ 732 2
91 ACO 3827 ClG 22 01 49.1 -59 57 15           ~ 178 0
92 ACO 2420 ClG 22 10 22.5 -12 11 13           ~ 126 0
93 ACO 2426 ClG 22 14 27.3 -10 22 05           ~ 91 0
94 ACT-CL J2214.9-1359 ClG 22 14 57.3 -14 00 12           ~ 100 0
95 BAX 337.1433+20.6131 ClG 22 28 32.6 +20 37 08           ~ 132 0
96 ClG J2229-2756 ClG 22 29 45.36 -27 55 36.5           ~ 50 0
97 ACO 3888 ClG 22 34 26.3 -37 44 29           ~ 151 1
98 ClG J2243-0935 ClG 22 43 21.1 -09 35 43           ~ 96 0
99 ACO S 1063 ClG 22 48 45.4 -44 31 42           ~ 395 0
100 ACT-CL J2327.4-0204 ClG 23 27 27.60 -02 04 37.4           ~ 44 0
101 ACO 2626 ClG 23 36 31.0 +21 09 36           ~ 265 0
102 ACT-CL J2337.4-5942 ClG 23 37 24.2 -59 42 17           ~ 52 0
103 ACT-CL J2341.2-5119 ClG 23 41 12.3 -51 19 43           ~ 52 0
104 ACO 2645 ClG 23 41 17.0 -09 01 11           ~ 98 0
105 ACT-CL J2344.7-4243 ClG 23 44 43.9 -42 43 11           ~ 229 0
106 ACO 2667 ClG 23 51 39.37 -26 05 02.7           ~ 190 0

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