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