2000A&A...353..124B -
Astronomy and Astrophysics, volume 353, 124-128 (2000/1-1)
The X-ray morphology of the lensing galaxy cluster Cl 0024+17.
BOEHRINGER H., SOUCAIL G., MELLIER Y., IKEBE Y. and SCHUECKER P.
Abstract (from CDS):
We report the analysis of a very deep ROSAT HRI observation on one of the most interesting, distant lensing clusters, Cl 0024+17. Using the X-ray surface brightness we analyse the cluster morphology and constrain the gas and gravitational mass of the cluster. We confirm the small core radius of the mass halo of 66
–25
+38h
50–1kpc for this cluster inferred previously from a detailed strong lensing analysis by Tyson et al. (
1998ApJ...498L.107T) and Smail et al. (
1997ApJ...479...70S). Using estimated gas temperatures we find a cluster mass of about 3-14x10
14h
50–1 M
☉ for a fiducial radius of 3h
50–1Mpc. This mass is lower than the mass implied by the weak lensing result of Bonnet et al. (
1994ApJ...427L..83B) and inconsistent with a virial analysis based on the high observed galaxy velocity dispersion. The lower gravitational mass found in the present study implies, however, a gas mass fraction of the cluster e.g. at 1 h
50–1Mpc radius of 17(11-28) h
50–1.5% well consistent with the general observations in rich clusters. This favours a lower mass value for the relaxed part of Cl 0024+17 which could still be embedded in a larger structure achieving a consistency with the weak lensing observations.
Abstract Copyright:
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Journal keyword(s):
galaxies: clusters: individual: Cl 0024+17 - cosmology: dark matter - cosmology: gravitational lensing
Simbad objects:
2
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