Gravitational Lensing of the Microwave Background by Galaxy Clusters

  • Holder G
  • Kosowsky A
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Abstract

Galaxy clusters will distort the pattern of temperature anisotropies in the microwave background via gravitational lensing. We create lensed microwave background maps using clusters drawn from numerical cosmological simulations. A distinctive dipole-like temperature fluctuation pattern is formed aligned with the underlying microwave temperature gradient. For a massive cluster, the characteristic angular size of the temperature distortion is a few arcminutes and the characteristic amplitude a few micro-Kelvin. We demonstrate a simple technique for estimating the lensing deflection induced by the cluster; microwave background lensing measurements have the potential to determine the mass distribution for some clusters with good accuracy on angular scales up to a few arcminutes. Future high-resolution and high-sensitivity microwave background maps will have the capability to detect lensing by clusters; we discuss various systematic limitations on probing cluster masses using this technique.

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CITATION STYLE

APA

Holder, G., & Kosowsky, A. (2004). Gravitational Lensing of the Microwave Background by Galaxy Clusters. The Astrophysical Journal, 616(1), 8–15. https://doi.org/10.1086/424808

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