2005ApJ...624..606J

Query : 2005ApJ...624..606J

2005ApJ...624..606J - Astrophys. J., 624, 606-629 (2005/May-2)

The evolution of structure in X-ray clusters of galaxies.

JELTEMA T.E., CANIZARES C.R., BAUTZ M.W. and BUOTE D.A.

Abstract (from CDS):

Using Chandra archival data, we quantify the evolution of cluster morphology with redshift. Clusters form and grow through mergers with other clusters and groups, and the amount of substructure in clusters in the present epoch and how quickly it evolves with redshift depend on the underlying cosmology. Our sample includes 40 X-ray-selected, luminous clusters from the Chandra archive, and we quantify cluster morphology using the power ratio method of Buote & Tsai. The power ratios are constructed from the moments of the X-ray surface brightness and are related to a cluster's dynamical state. We find that, as expected qualitatively from hierarchical models of structure formation, high-redshift clusters have more substructure and are dynamically more active than low-redshift clusters. Specifically, the clusters with z>0.5 have significantly higher average third- and fourth-order power ratios than the lower redshift clusters. Of the power ratios, P3/P0is the most unambiguous indicator of an asymmetric cluster structure, and the difference in P3/P0 between the two samples remains significant even when the effects of noise and other systematics are considered. After correcting for noise, we apply a linear fit to P3/P0versus redshift and find that the slope is greater than zero at better than 99% confidence. This observation of structure evolution indicates that dynamical state may be an important systematic effect in cluster studies seeking to constrain cosmology, and when calibrated against numerical simulations, structure evolution will itself provide interesting bounds on cosmological models.

Abstract Copyright: ∼

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

CDS comments: table 1 : V1121.0+2327 = [VMF98] 100, V1221.4+4918 = [VMF98] 119

Simbad objects: 42

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Number of rows : 42
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 ClG 0016+16 ClG 00 18 33.3 +16 26 36           ~ 517 0
2 ClG J0152-1358 ClG 01 52 41.3 -13 58 13           ~ 262 3
3 ACO 267 ClG 01 52 43.016 +00 59 58.90           ~ 241 0
4 ClG 0303+1658 ClG 03 05 31.6 +17 10 02     20.13     ~ 92 0
5 ACT-CL J0438.9+0716 ClG 04 39 00.7 +07 15 45           ~ 62 0
6 BAX 069.7593+05.3453 ClG 04 39 02.2 +05 20 43           ~ 82 0
7 ACO 520 ClG 04 54 10.1 +02 55 38           ~ 465 0
8 ClG 0451-03 ClG 04 54 10.9 -03 01 07     20.0     ~ 368 0
9 ClG J0542-4100 ClG 05 42 49.9 -40 59 58           ~ 67 0
10 ACO 665 ClG 08 30 45.2 +65 52 55           ~ 457 0
11 ZwCl 0847+3617 ClG 08 50 12.0 +36 03 36           ~ 75 0
12 ClG 0906.5+1110 ClG 09 09 12.7 +10 58 32           ~ 108 0
13 ACO 773 ClG 09 17 51.3 +51 43 20           ~ 308 0
14 ACO 781 ClG 09 20 25.4 +30 30 07           ~ 167 0
15 ACO 963 ClG 10 17 03.4 +39 02 56           ~ 414 0
16 ZwCl 1021+0426 ClG 10 23 39.0 +04 11 14   15.6 17.95     ~ 297 0
17 ClG 1054-03 ClG 10 57 00.2 -03 37 27     22     ~ 458 0
18 ClG J1113-2615 ClG 11 13 05.7 -26 15 36           ~ 37 0
19 ClG J1120+2326 ClG 11 20 57.9 +23 26 41           ~ 42 0
20 ClG 1137+66 ClG 11 40 23.0 +66 08 16     21.0     ~ 141 0
21 ACO 1413 ClG 11 55 12.87 +23 23 46.9           ~ 456 0
22 NAME North Polar Spur ISM 12 00 +00.0           ~ 405 1
23 ClG J1221+4918 ClG 12 21 25.0 +49 18 07           ~ 60 0
24 ClG J1226+3332 ClG 12 26 57.7 +33 32 50           ~ 228 0
25 ACO 1758 ClG 13 32 32.1 +50 30 37           ~ 266 2
26 ClG J1350+6007 ClG 13 50 48.55 +60 07 06.7           ~ 46 0
27 ZwCl 1358+6245 ClG 13 59 54.3 +62 30 36     18.5     ~ 370 0
28 ACO 1914 ClG 14 25 57.4 +37 49 54           ~ 338 0
29 ACO 2034 ClG 15 10 03.9 +33 30 57           ~ 248 1
30 LEDA 1900245 Bla 15 32 53.780 +30 20 59.41   19.1   15.7 17.819 ~ 155 1
31 ClG J1532+3021 ClG 15 32 53.8 +30 21 00           ~ 122 0
32 ACO 2111 ClG 15 39 40.9 +34 25 04           ~ 188 0
33 ACO 2218 ClG 16 35 54.0 +66 13 00           ~ 827 1
34 ACO 2219 ClG 16 40 22.1 +46 42 20           ~ 381 0
35 ClG J1716+6708 ClG 17 16 49.6 +67 08 30           ~ 137 0
36 ClG J1720+2638 ClG 17 20 09.6 +26 37 35           ~ 284 0
37 ACO 2261 ClG 17 22 26.9 +32 07 58           ~ 370 0
38 ClG 2053-04 ClG 20 56 21.2 -04 37 46   21.0       ~ 168 0
39 ClG J2129+0005 ClG 21 29 40.5 +00 05 47           ~ 308 0
40 ClG 2137-2353 ClG 21 40 12.8 -23 39 27     18.5     ~ 390 0
41 ACO 2390 ClG 21 53 37.4 +17 41 46           ~ 732 2
42 ClG J2302+0844 ClG 23 02 48.1 +08 43 50           ~ 43 0

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