Small-Scale Cosmic Microwave Background Observations at 8.4 GHz

Details Small-Scale Cosmic Microwave Background Observations at 8.4 GHz Small-Scale Cosmic Microwave Background Observations at 8.4 GHz

Jul 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...483...38p&link_type=abstract

Astrophysical Journal v.483, p.38

Astronomy and Astrophysics

Astronomy

53

Cosmology: Cosmic Microwave Background, Cosmology: Observations, Radio Continuum: General

Scientific paper

We have used the Very Large Array (VLA) of the National Radio Astronomy Observatory at 8.44 GHz to image a ~40 arcmin2 field with an unprecedented rms sensitivity of 1.5 mu Jy. After correcting for the effects of discrete foreground radio sources, we examined this most sensitive microwave image of the sky for fluctuations in the cosmic microwave background radiation (CBR). At the 6" resolution of our VLA map, Delta T/T ~ (0.7 +/- 0.8) x 10-4, with an upper limit of 1.3 x 10-4 at 95% confidence. At 1' resolution, we measure a fluctuation amplitude of Delta T/T = (1.2 +/- 1.4) x 10-5. We also report on our observations of the linear and circular polarization of the CBR for which we derive upper limits (at 95% confidence) of Delta T/T <= 1.1 x 10-5 and Delta T/T <= 1.6 x 10-5, respectively, on an angular scale of 1'.

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