An Absolute Measurement of the Cosmic Microwave Background Radiation Temperature at 20 Centimeters

Details An Absolute Measurement of the Cosmic Microwave Background Radiation Temperature at 20 Centimeters An Absolute Measurement of the Cosmic Microwave Background Radiation Temperature at 20 Centimeters

Feb 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...458..407s&link_type=abstract

Astrophysical Journal v.458, p.407

Astronomy and Astrophysics

Astronomy

19

Cosmology: Cosmic Microwave Background, Cosmology: Observations, Cosmology: Diffuse Radiation

Scientific paper

A ground-based radiometer is used to measure the absolute temperature of the cosmic microwave background radiation (CMBR) 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 radiometer zero offset is measured 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. Over the region observed, the Galactic component is ˜1 K and varies by ˜10%. Cold loads are used to measure the instrumental emission. The ability to sample narrow (5 MHz) frequency bins across a 5% bandpass provides a powerful tool for studying systematic effects. For the absolute temperature of the CM BR, we find TCMBR = 2.65+0.33-0.30 K. This result is higher, but not significantly, than the value of TCMBR at 1.4 GHz previously reported by Bensadoun et al.

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