Australia Telescope Search for Cosmic Microwave Background Anisotropy

Details Australia Telescope Search for Cosmic Microwave Background Anisotropy Australia Telescope Search for Cosmic Microwave Background Anisotropy

1998-05-19

arxiv.org/abs/astro-ph/9805245v1

Mon.Not.Roy.Astron.Soc.298:1189-1197,1998

Astronomy and Astrophysics

Astrophysics

Tex, 10 pages with 7 embedded figures, uses mn.tex accepted for publication in MNRAS

Scientific paper

10.1046/j.1365-8711.1998.01748.x

We have made an 8.7 GHz image of a sky region with a resolution of 8 arcmin and high brightness sensitivity using the Australia Telescope Compact Array (ATCA). in an ultra compact 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 Q_flat < 23.6 microK with 95 per cent confidence; the ATCA filter function F_l in multipole l-space peaks at l_eff = 4700 and has half maximum values at l = 3350 and 6050.

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