2003A&A...398...41P


C.D.S. - SIMBAD4 rel 1.7 - 2020.12.02CET12:00:52

2003A&A...398...41P - Astronomy and Astrophysics, volume 398, 41-48 (2003/1-4)

Aspherical galaxy clusters: Effects on cluster masses and gas mass fractions.

PIFFARETTI R., JETZER P. and SCHINDLER S.

Abstract (from CDS):

We present an investigation of the effects of asphericity on the estimates of total mass and gas mass fraction in galaxy clusters from X-ray observations. We model the aspherical shape of galaxy clusters by a triaxial model and compare the true total mass and the true total gas mass fraction with the corresponding quantities obtained with the assumption of spherical symmetry. In the triaxial model we allow the extent along the line of sight to vary in order to describe elongated and compressed cluster shapes. Using a sample of 10 ROSAT clusters and a recent CHANDRA observation we find the following results. For prolate or oblate shapes the difference between triaxial and spherical model both in the mass and in the gas mass fraction are negligible (less than 3%). For more aspherical shapes the total mass is underestimated (overestimated) in the centre, if the cluster is compressed (elongated). The gas mass fraction is overestimated for compressed clusters and slightly underestimated for elongated clusters. Comparing X-ray masses with gravitational lensing estimates, we find that elongations along the line of sight can resolve discrepancies of masses determined by the two different methods of up to ∼30%. The combination of Sunyaev-Zel'dovich and X-ray observations is useful to measure the elongation of the cluster along the line of sight. As an application, we estimate the elongation of the cluster CL 0016+16 with two different approaches, Sunyaev-Zel'dovich measurements and comparison of weak lensing and X-ray masses, and find reasonable agreement.

Abstract Copyright:

Journal keyword(s): galaxies: clusters: general - X-ray: galaxies: clusters

Simbad objects: 11

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Number of rows : 11

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 ClG 0016+16 ClG 00 18 33.3 +16 26 36           ~ 476 0
2 ACO 478 ClG 04 13 20.7 +10 28 35           ~ 473 0
3 NAME Hydra I Cluster ClG 10 36 36.0 -27 31 04           ~ 780 1
4 ACO 1068 ClG 10 40 47.1 +39 57 19           ~ 188 0
5 ACO 1413 ClG 11 55 18.0 +23 24 19           ~ 383 0
6 ACO 1795 ClG 13 49 00.5 +26 35 07           ~ 1171 0
7 ACO 2029 ClG 15 10 58.7 +05 45 42           ~ 865 0
8 ACO 2199 ClG 16 28 37.0 +39 31 28           ~ 1110 1
9 ACO 2256 ClG 17 03 43.5 +78 43 03           ~ 835 1
10 ACO 2390 ClG 21 53 34.6 +17 40 11           ~ 630 2
11 ACO 2597 ClG 23 25 19.70 -12 07 27.7           ~ 500 0

    Equat.    Gal    SGal    Ecl

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2020.12.02-12:00:52

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