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Title:
Implications for gravitational lensing and the dark matter content in clusters of galaxies from spatially resolved x-ray spectra
Authors:
Loewenstein, M.
Affiliation:
AA(NASA. Goddard Space Flight Center, Greenbelt, MD, US)
Publication:
The Astrophysical Journal, Part 1, vol. 431, no. 1, p. 91-103 (ApJ Homepage)
Publication Date:
08/1994
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Dark Matter, Galactic Clusters, Gravitational Lenses, Interstellar Matter, Stellar Temperature, X Ray Spectra, Astronomical Models, Red Shift, Spatial Resolution, Stellar Spectra, Temperature Distribution
DOI:
10.1086/174469
Bibliographic Code:
1994ApJ...431...91L

Abstract

A simple method for deriving well-behaved temperature solutions to the equation of hydrostatic equilibrium for intracluster media with X-ray imaging observations is presented and applied to a series of generalized models as well as to observations of the Perseus cluster and Abell 2256. In these applications the allowed range in the ratio of nonbaryons to baryons as a function of radius is derived, taking into account the uncertainties and crude spatial resolution of the X-ray spectra and considering a range of physically reasonable mass models with various scale heights. Particular attention is paid to the central regions of the cluster, and it is found that the dark matter can be sufficiently concentrated to be consistent with the high central mass surface densities for moderate-redshift clusters from their gravitational lensing properties.

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