Journal Article

The Australia Telescope search for cosmic microwave background anisotropy

Ravi Subrahmanyan, Michael J. Kesteven, Ronald D. Ekers, Malcolm Sinclair and Joseph Silk

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 298, issue 4, pages 1189-1197
Published in print August 1998 | ISSN: 0035-8711
Published online August 1998 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-8711.1998.01748.x
The Australia Telescope search for cosmic microwave background anisotropy

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Abstract

In an attempt to detect cosmic microwave background (CMB) anisotropy on arcmin scales, we have made an 8.7-GHz image of a sky region with a resolution of 2 arcmin and high surface brightness sensitivity using the Australia Telescope Compact Array (ATCA) in an ultracompact configuration. The foreground discrete-source confusion was estimated from observations with higher resolution at the same frequency and in a scaled array at a lower frequency. Following the subtraction of the foreground confusion, the field shows no features in excess of the instrument noise. This limits the CMB anisotropy flat-band power to Qflat < 23.6 μ K with 95 per cent confidence; the ATCA filter function (which is available at the website www.atnf.csiro.au/Research/cmbr/cmbr_atca.html) Fl in multipole l-space peaks at leff = 4700 and has half-maximum values at l = 3350 and 6050.

Keywords: techniques: interferometric; cosmic microwave background; cosmology: observations; radio continuum: general

Journal Article.  0 words. 

Subjects: Astronomy and Astrophysics

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