A Search for Small-Scale Anisotropy in the Cosmic Microwave Background

Details A Search for Small-Scale Anisotropy in the Cosmic Microwave Background A Search for Small-Scale Anisotropy in the Cosmic Microwave Background

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...419l..45t&link_type=abstract

Astrophysical Journal Letters v.419, p.L45

Astronomy and Astrophysics

Astronomy

52

Cosmology: Cosmic Microwave Background, Cosmology: Observations

Scientific paper

We report the preliminary result of a search for cosmic microwave background (CMB) anisotropy. We made observations using a specially designed radiometer and on-axis Cassegrain telescope. The beam size was 12' at a frequency of 90 GHz. Observations were made during 1993 January from the South Pole. We observed five regions of sky near declination -75^deg^, and set a 95% confidence level upper limit of {DELTA}T < 2.3 x 10^-5^T_CMB_ on Gaussian-correlated CMB anisotropy at an angular scale of 0.15^deg^. This is the lowest upper limit to date on CMB anisotropy at this angular scale.

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