Evidence from gravitational lensing for a non-thermal pressure support in the cluster of galaxies A2218

Details Evidence from gravitational lensing for a non-thermal pressure support in the cluster of galaxies A2218 Evidence from gravitational lensing for a non-thermal pressure support in the cluster of galaxies A2218

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aipc..336..330l&link_type=abstract

Dark matter. AIP Conference Proceedings, Volume 336, pp. 330-330 (1995).

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Gravitational Lenses And Luminous Arcs, Galaxy Clusters

Scientific paper

The central mass distribution of clusters of galaxies can be inferred from gravitationally lensed arcs with known redshifts. For the Abell cluster 2218, this method yields a core mass which is larger by a factor of 2.5+/-0.5 than the value deduced from X-ray observations, under the assumptions that the gas is supported by thermal pressure and that the cluster is spherical. We examine quantitatively various potential causes for this discrepancy, and show that a non-thermal pressure support is a plausible explanation. Such a pressure can be naturally provided by strong turbulence and equipartition magnetic field (~50 μG) that are tangled on small scales in the cluster core. The turbulent and magnetic pressures do not affect the measured Sunyaev-Zel'dovich (SZ) effect for this cluster. Intracluster magnetic fields with a comparable magnitude (~101-2 μG) have already been detected by Faraday rotation in other clusters. If generic, a small-scale equipartition magnetic field should affect the structure of cooling flows and must be included in X-ray determinations of cluster masses.

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