Probing the gravitational potential of a nearby lensing cluster Abell 2104

Liang, H ORCID: 0000-0001-9496-406X, Lémonon, L, Valtchanov, I, Pierre, M and Soucail, G, 2000. Probing the gravitational potential of a nearby lensing cluster Abell 2104. Astronomy and Astrophysics, 363 (2), pp. 440-450.

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Abstract

The cluster Abell 2104 is one of the lowest redshift clusters (z = 0.153) known to have a gravitational lensing arc. We present detailed analysis of the cluster properties such as the gravitational potential using the X-ray data from ROSAT (HRI) and ASCA, as well as optical imaging and spectroscopic data from the CFHT. The cluster is highly luminous in the X-ray with a bolometric luminosity of Lx↑ 3 × 1045 ergs s−1 and a high gas temperature of ↑ 10.4 keV. The X-ray emission extending out to at least a radius of 1.46 Mpc, displays significant substructure. The total mass deduced from the X-ray data under the assumption of hydrostatic equilibrium and isothermal gas, is found to beMtot(r < 1.46Mpc) ↑ (8.0±0.8)×1014M. The gas fraction within a radius of 1.46 Mpc is ↑ 5−10%. The cluster galaxy velocity distribution has a dispersion of 1200 ± 200 km s−1 with no obvious evidence for substructure. The total mass within 1.46 Mpc, deduced from Jean’s equation using the observed galaxy number density distribution and velocity dispersion, is found to be ↑ 6.8 × 1014M to ↑ 2.6 × 1015M marginally consistent with the X-ray deduced total mass.

Item Type: Journal article
Publication Title: Astronomy and Astrophysics
Creators: Liang, H., Lémonon, L., Valtchanov, I., Pierre, M. and Soucail, G.
Publisher: EDP Sciences
Date: 2000
Volume: 363
Number: 2
Rights: © 2000 European Southern Observatory
Divisions: Schools > School of Science and Technology
Depositing User: EPrints Services
Date Added: 09 Oct 2015 11:04
Last Modified: 09 Jun 2017 13:48
URI: http://irep.ntu.ac.uk/id/eprint/22280

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