2001MNRAS.320...49K

Query : 2001MNRAS.320...49K

2001MNRAS.320...49K - Mon. Not. R. Astron. Soc., 320, 49-60 (2001/January-1)

Searching for cluster substructure using APM and ROSAT data.

KOLOKOTRONIS V., BASILAKOS S., PLIONIS M. and GEORGANTOPOULOS I.

Abstract (from CDS):

We present a detailed study of the morphological features of 22 rich galaxy clusters. Our sample is constructed from a cross-correlation of optical (z ≃ Ω0–1 - 1) data with X-ray (0.1-2.4keV) ROSAT pointed observations. We systematically compare cluster images and morphological parameters in an attempt to reliably identify possible substructure in both optical and the X-ray images. To this end, we compute various moments of the optical and X-ray surface-brightness distribution such as the ellipticities, centre-of-mass shifts and ellipsoidal orientations. We assess the significance of our results using Monte Carlo simulations. We find significant correlations between the optical and X-ray morphological parameters, indicating that in both parts of the spectrum it is possible to identify correctly the dynamical state of a cluster. Most of our clusters (17/22) have a good one-to-one correspondence between the optical and the X-ray images, and about 10 appear to have strong indications of substructure. This corresponds to a minimum percentage of order ∼45per cent, which is in very good accordance with other similar analyses. Finally, five out of 22 systems (∼22per cent) seem to have distinct subclumps in the optical which are not verified in the X-ray images, and thus are suspect of being due to optical projection effects. These results will serve as a useful guide in interpreting subsequent analyses of large optical cluster catalogues.

Abstract Copyright: 2001, Royal Astronomical Society

Journal keyword(s): galaxies: clusters: general - large-scale structure of Universe - X-rays: galaxies - X-rays: galaxies: clusters

Simbad objects: 26

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Number of rows : 26
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 ACO 2734 ClG 00 11 21.60 -28 51 16.6           ~ 156 0
3 ACO 2804 ClG 00 39 37.84 -28 54 22.2           ~ 23 0
4 ACO 2811 ClG 00 42 08.82 -28 32 08.8           ~ 78 0
5 ACO 122 ClG 00 57 25.03 -26 16 47.9           ~ 42 0
6 ACO 133 ClG 01 02 41.5 -21 52 53           ~ 391 1
7 ACO 2933 ClG 01 40 41.2 -54 33 26           ~ 28 0
8 ACO 3049 ClG 02 45 28 -53 11.4           ~ 2 0
9 ACO 3093 ClG 03 10 52.0 -47 23 43           ~ 34 0
10 ACO 3111 ClG 03 17 49.3 -45 42 24           ~ 38 0
11 ACO 3112 ClG 03 17 52.9 -44 15 06           ~ 329 1
12 ACO 3128 ClG 03 29 50.6 -52 34 48           ~ 183 3
13 ACO 3144 ClG 03 37 23.1 -55 06 18           ~ 33 0
14 ACO 3158 ClG 03 43 07.5 -53 38 09           ~ 327 0
15 ACO 3223 ClG 04 08 34.5 -30 49 08           ~ 59 2
16 ACO 3264 ClG 04 31 19.3 -49 17 38           ~ 15 0
17 ACO 3266 ClG 04 31 26.4 -61 25 17           ~ 447 0
18 ACO 500 ClG 04 38 55.0 -22 05 55           ~ 89 0
19 ACO 514 ClG 04 48 18 -20 28.7           ~ 149 0
20 ACO 3301 ClG 05 01 05.8 -38 43 58           ~ 44 0
21 ACO 2384 ClG 21 52 20.9 -19 32 53           ~ 117 0
22 ACO 2462 ClG 22 39 17.3 -17 22 23           ~ 96 0
23 ACO 3921 ClG 22 49 59.0 -64 25 48           ~ 165 1
24 ACO 2580 ClG 23 21 23.3 -23 11 16           ~ 49 0
25 ACO 4038 ClG 23 47 31.1 -28 12 10           ~ 349 3
26 ACO 4059 ClG 23 57 02.2 -34 45 58           ~ 400 1

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