Abstract
Long arcs in clusters of galaxies, produced by gravitational lensing of background galaxies, allow us to determine the total projected mass within the radius of the arc. We use the mass measurement inferred from lensing in cluster A2218, along with measurements of the temperature and the radial profile of the intracluster gas determined from X-ray measurements, to test whether the hot intracluster gas is supported by the thermal pressure within the gravitational potential of the cluster. We find that the mass implied by lensing is too large by a factor ~ 2.5; equivalently, if the lensing mass is fixed, the effective temperature required for pressure support is larger than that observed by the same factor. The discrepancy results from the fact that the observed arcs imply a highly concentrated mass profile, whereas the X-ray profile implies an extended gas distribution. Several ways of resolving the discrepancy are discussed.
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Miralda-Escudé, J., Babul, A. (1994). Using Gravitational Lensing to Test the Pressure-Supported Hot Intracluster Gas Hypothesis in A2218. In: Seitter, W.C. (eds) Cosmological Aspects of X-Ray Clusters of Galaxies. NATO ASI Series, vol 441. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-1022-8_25
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DOI: https://doi.org/10.1007/978-94-011-1022-8_25
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