An absolute measurement of the cosmic background radiation temperature at 1.4 GHz

Details An absolute measurement of the cosmic background radiation temperature at 1.4 GHz An absolute measurement of the cosmic background radiation temperature at 1.4 GHz

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993phdt.........6s&link_type=abstract

Ph.D. Thesis Princeton Univ., NJ.

Computer Science

3

Background Radiation, Cryogenic Equipment, Frequencies, Horn Antennas, Radiometers, Receivers, Airglow, Calibrating, Pencil Beams

Scientific paper

A ground-based radiometer is used to measure the absolute temperature of the cosmic background radiation (CBR) at a frequency of 1.4 GHz. The instrument comprises a corrugated horn antenna coupled to a cryogenic correlation receiver. Accurate gain calibrations are made every few minutes; the zero-level is calibrated at the beginning and the end of the observing season. Tip scans are made to measure the atmospheric emission. We find Tatm = 1550 +/- 170 mK for a pencil beam measured from an elevation of 836 m. The galactic foreground emission is removed by extrapolation from a lower-frequency map. Cold loads are used to measure the instrumental emission. The ability to sample narrow (5 MHz) frequency bins across a 5 percent band pass provides a powerful tool for studying systematic effects. The systematic errors are described in detail. For the absolute temperature of the CBR, we find TCBR = 2.65 (+.33)(-.30) K. This result is in agreement with recent very accurate measurements at higher frequencies. However, the result reported here does not conflict with a low value of TCBR at 1.4 GHz which has also been reported.

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