Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...419l..49w&link_type=abstract
Astrophysical Journal Letters v.419, p.L49
Astronomy and Astrophysics
Astronomy
96
Cosmology: Cosmic Microwave Background, Cosmology: Observations
Scientific paper
We detect anisotropy in celestial radiation at degree angular scales between 26 and 36 GHz. The fluctuations have the spectral index of the cosmic microwave background radiation. The rms amplitude, {DELTA}_rms_, of the fluctuations in the data set is 33_-9_^+10^ microK, and the average spectral index, β, is -0.3_-1.2_^+0.7^; for the cosmic microwave background, β = 0. The 95% confidence upper limit on the anisotropy of the polarization is 25 microK. The most likely amplitude of a Gaussian correlation function, a scan- and beam-independent measure of the fluctuations, is 41_-13_^+16^ microK with β = -0.3_-1.2_^+0.7^ at a coherence angle of 1.2^deg^. At these frequencies, some fraction of {DELTA}_rms_ is probably due to anisotropy in free-free emission (β = - 2.1), but our bounds on the spectral index argue that the free-free contribution is not large. Known compact sources and synchrotron radiation do not contribute substantially to the detected anisotropy.
Jarosik N. C.
Netterfield Calvin. B.
Page Lyman A.
Wilkinson Dave
Wollack Edward J.
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