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Issue A&A
Volume 429, Number 1, January I 2005
Page(s) 49 - 64
Section Cosmology (including clusters of galaxies)
DOI http://dx.doi.org/10.1051/0004-6361:20040426



A&A 429, 49-64 (2005)
DOI: 10.1051/0004-6361:20040426

Some astrophysical implications of dark matter and gas profiles in a new galaxy cluster model

V. F. Cardone1, E. Piedipalumbo2 and C. Tortora2

1  Dipartimento di Fisica "E.R. Caianiello", Università di Salerno, and INFN, Sez. di Napoli, Gruppo Coll. di Salerno, Via S. Allende, 84081 Baronissi (Salerno), Italy
    e-mail: winny@na.infn.it
2  Dipartimento di Scienze Fisiche, Università di Napoli, and INFN, Sez. di Napoli, Complesso Universitario di Monte S. Angelo, Via Cinthia, Edificio G, 80126 Napoli, Italy

(Receveid 11 March 2004 / Accepted 30 July 2004)

Abstract
Recently, Rasia et al. (2004, MNRAS, 531, 237) proposed a new dynamical model for the mass density profile of clusters of galaxies as a result of a set of high resolution hydrodynamical simulations of structure formation. We investigate the lensing properties of this model evaluating the deflection angle, the lensing potential and the amplification of the images. We give particular attention to the structure and position of the critical curves to see whether this model is able to produce radial and tangential arcs. With this aim we also investigate the effect of taking into account the brightest cluster galaxy in the lensing potential and the deviations from spherical symmetry mimicked by an external shear. We also analyze the implication of the gas density and temperature profiles of the Rasia et al. (2004) model for the properties of the X-ray emission and the comptonization parameter that determines the CMBR temperature decrement due to the Sunyaev-Zel'dovich effect.


Key words: galaxies: clusters: general -- gravitational lensing -- dark matter

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