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Дата изменения: Thu Jun 19 17:49:46 1997
Дата индексирования: Tue Oct 2 18:48:49 2012
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Abstract

Proceedings of the Particle Physics and Early Universe Conference (PPEUC).
For this paper: postscript up PPEUC CMB index next 1 Introduction...

Foreground sources, gravitational lensing
and the microwave background

A.W. Blain

Cavendish Laboratory, Madingley Road, Cambridge CB3 0HE, U.K.

Abstract:

An extremely sensitive all-sky survey will be carried out in the millimetre/submillimetre waveband by the High-Frequency Instrument (HFI) aboard the forthcoming ESA mission Planck Surveyor; formerly COBRAS/SAMBA. The main scientific goal of the mission is to make very accurate measurements of the spatial power spectrum of primordial anisotropies in the cosmic microwave background radiation; however, hundreds of thousands of distant dusty foreground galaxies and quasars will also be detected. These sources are much more likely to be gravitationally lensed by intervening galaxies as compared with sources discovered in surveys in other wavebands. Here the number of galaxy--galaxy lenses expected in a Planck survey is estimated, and techniques for discriminating between lensed and unlensed sources are discussed. We predict that several hundred lenses could be detected: a sample that would be an extremely valuable resource in observational cosmology. The effect of lensing by clusters is then discussed briefly. This is expected to increase the source confusion noise in a Planck survey in the directions of clusters, and could provide information about galaxies with flux densities that are too faint to be detected directly by Planck.

PPEUC Proceedings
Thu Jun 19 14:22:31 BST 1997