An upper limit to arcminute-scale anisotropy in the cosmic microwave background radiation at 142 GHz

Church, S. E., Ganga, K. M., Ade, Peter A. R. ORCID: https://orcid.org/0000-0002-5127-0401, Holzapfel, W. L., Mauskopf, Philip Daniel ORCID: https://orcid.org/0000-0001-6397-5516, Wilbanks, T. M. and Lange, A. E. 1997. An upper limit to arcminute-scale anisotropy in the cosmic microwave background radiation at 142 GHz. The Astrophysical Journal 484 (2) , pp. 523-537. 10.1086/304362

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Abstract

We present limits to anisotropies in the cosmic microwave background radiation (CMB) at angular scales of a few arcminutes. The observations were made at a frequency of 142 GHz using a six-element bolometer array (the Sunyaev-Zel'dovich Infrared Experiment) at the Caltech Submillimeter Observatory. Two patches of sky, each approximately 36' × 4' and free of known sources, were observed for a total of 6-8 hours each, resulting in approximately 80 independent 1farcm7 full width half-maximum pixels. Each pixel is observed with both a dual-beam and a triple-beam chop, with a sensitivity per pixel of 90-150 μK in each chop. These data have been analyzed using maximum-likelihood techniques by assuming a Gaussian autocorrelation function for the distribution of CMB fluctuations on the sky. We set an upper limit of ΔT/T ≤ 2.1 × 10-5 (95% confidence) for a coherence angle to the fluctuations of 1farcm1. These limits are comparable to the best limits obtained from centimeter-wavelength observations on similar angular scales but have the advantage that the contribution from known point sources is negligible at these frequencies. They are the most sensitive millimeter-wavelength limits for coherence angles ≤3'. The results are also considered in the context of secondary sources of anisotropy, specifically the Sunyaev-Zel'dovich effect from galaxy clusters.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Subjects:	Q Science > QB Astronomy
Publisher:	IOP Publishing
ISSN:	0004-637X
Last Modified:	24 Oct 2022 11:27
URI:	https://orca.cardiff.ac.uk/id/eprint/48201

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