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An Australia telescope survey for CMB anisotropies | R. Subrahmanyan
; M. J. Kesteven
; R. D. Ekers
; M. Sinclair
; J. Silk
; | Date: |
24 Feb 2000 | Journal: | Mon.Not.Roy.Astron.Soc. 315 (2000) 808 | Subject: | astro-ph | Affiliation: | 1 and 2), M. J. Kesteven , R. D. Ekers , M. Sinclair, J. Silk ( ATNF, Australia, RRI, India, UCB | Abstract: | We have surveyed six distinct `empty fields’ using the Australia Telescope Compact Array in an ultra-compact configuration with the aim of imaging, with a high brightness sensitivity, any arcmin-scale brightness-temperature anisotropies in the background radio sky. The six well-separated regions were observed at a frequency of 8.7 GHz and the survey regions were limited by the ATCA primary beams which have a full width at half maximum of 6 arcmin at this frequency; all fields were observed with a resolution of 2 arcmin and an rms thermal noise of 24 microJy/beam. After subtracting foreground confusion detected in higher resolution images of the fields, residual fluctuations in Stokes I images are consistent with the expectations from thermal noise and weaker (unidentified) foreground sources; the Stokes Q and U images are consistent with expectations from thermal noise. Within the sensitivity of our observations, we have no reason to believe that there are any Sunyaev-Zeldovich holes in the microwave sky surveyed. Assuming Gaussian-form CMB anisotropy with a `flat’ spectrum, we derive 95 per cent confidence upper limits of Q_flat < 10--11 microK in polarized intensity and Q_flat < 25 microK in total intensity. The ATCA filter function peaks at l=4700 and has half maximum values at l=3350 and 6050. | Source: | arXiv, astro-ph/0002467 | Services: | Forum | Review | PDF | Favorites |
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