2006ApJ...645..170S

Query : 2006ApJ...645..170S

2006ApJ...645..170S - Astrophys. J., 645, 170-178 (2006/July-1)

Measuring the three-dimensional structure of galaxy clusters. II. Are clusters of galaxies oblate or prolate?

SERENO M., DE FILIPPIS E., LONGO G. and BAUTZ M.W.

Abstract (from CDS):

The intrinsic shape of galaxy clusters can be obtained through a combination of X-ray and Sunyaev-Zeldovich effect observations once cosmological parameters are assumed to be known. In this paper we discuss the feasibility of modeling galaxy clusters as either prolate or oblate ellipsoids. We analyze the intracluster medium distribution for a sample of 25 X-ray-selected clusters, with measured Sunyaev-Zeldovich temperature decrements. A mixed population of prolate and oblate ellipsoids of revolution fits the data well, with prolate shapes preferred by ∼60%-76%. We observe an excess of clusters nearly aligned along the line of sight, with respect to what is expected from a randomly oriented cluster population, which might imply the presence of a selection bias in our sample. We also find signs that a more general triaxial morphology might better describe the morphology of galaxy clusters. Additional constraints from gravitational lensing could disentangle the degeneracy between an ellipsoidal and a triaxial morphology, and could also allow an unbiased determination of the Hubble constant.

Abstract Copyright: ∼

Journal keyword(s): Cosmology: Cosmic Microwave Background - Cosmology: Observations - Cosmology: Distance Scale - Galaxies: Clusters: General - Cosmology: Gravitational Lensing - X-Rays: Galaxies: Clusters

Simbad objects: 25

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Number of rows : 25
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 ClG 0016+16 ClG 00 18 33.3 +16 26 36           ~ 502 0
2 ACO 370 ClG 02 39 50.5 -01 35 08           ~ 747 0
3 ACO 399 ClG 02 57 56.4 +13 00 59           ~ 396 0
4 ACO 401 ClG 02 58 56.9 +13 34 56           ~ 566 0
5 ACO 478 ClG 04 13 20.7 +10 28 35           ~ 502 0
6 ACO 520 ClG 04 54 10.1 +02 55 38           ~ 436 0
7 ClG 0451-03 ClG 04 54 10.9 -03 01 07     20.0     ~ 352 0
8 ACO 611 ClG 08 00 58.7 +36 02 49           ~ 258 0
9 ACO 665 ClG 08 30 45.2 +65 52 55           ~ 437 0
10 ACO 697 ClG 08 42 57.6 +36 21 45           ~ 253 0
11 ACO 773 ClG 09 17 51.3 +51 43 20           ~ 295 0
12 ClG 1137+66 ClG 11 40 23.0 +66 08 16     21.0     ~ 138 0
13 ACO 1413 ClG 11 55 12.87 +23 23 46.9           ~ 430 0
14 ACO 1651 ClG 12 59 22.43 -04 11 47.1           ~ 290 0
15 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 4803 2
16 ACO 1689 ClG 13 11 29.5 -01 20 28           ~ 1125 0
17 ClG J1347-1145 ClG 13 47 30.5 -11 45 07           ~ 548 0
18 ZwCl 1358+6245 ClG 13 59 54.3 +62 30 36     18.5     ~ 361 0
19 ACO 1835 ClG 14 01 02.07 +02 52 43.2           ~ 689 1
20 ACO 1995 ClG 14 52 55.0 +58 02 59           ~ 130 0
21 ACO 2142 ClG 15 58 14.38 +27 12 57.8           ~ 768 0
22 ACO 2163 ClG 16 15 46.1 -06 08 50           ~ 563 0
23 ACO 2218 ClG 16 35 54.0 +66 13 00           ~ 809 1
24 ACO 2256 ClG 17 03 09.4 +78 39 36           ~ 885 1
25 ACO 2261 ClG 17 22 26.9 +32 07 58           ~ 342 0

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