Limits to the small-scale fluctuations in the cosmic background radiation

Details Limits to the small-scale fluctuations in the cosmic background radiation Limits to the small-scale fluctuations in the cosmic background radiation

Feb 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...277l..23f&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 277, Feb. 15, 1984, p. L23-L26.

Astronomy and Astrophysics

Astronomy

33

Microwaves, Radio Astronomy, Relic Radiation, Crosstalk, Fourier Transformation, Very Large Array (Vla)

Scientific paper

The Very Large Array has been used at 4.9 GHz to measure the fluctuations in the cosmic background radiation by examining a radio field of 10-arcmin diameter. The rms sensitivity level of 14 micro-Jy (0.0022 K at 18-arcsec resolution), reached in 40 hours of integration, was limited equally by receiver noise and low-level interference signals between the antennas. These spurious signals produced excess fluctuations near the field center, not unlike those caused by possible sky fluctuations. An analysis of these excess fluctuations leads to the following limits: no fluctuations in the 2.7 K background greater than 0.10, 0.08, and 0.05 percent (95 percent confidence level) at 18, 30, and 60 arcsec resolutions respectively.

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