1965/07/01 by A. A. Penzias, R. W. Wilson · 8 citations
Physics and Astronomy · #Scientific Research and Discoveries #Superconducting and THz Device Technology #Radio Astronomy Observations and Technology
paper · doi:10.1086/148307
openalex publication_date 1965/07/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Measurements of the effective zenith noise temperature of the 20-foot horn-reflector antenna (Crawford, Hogg, and Hunt 1961) at the Crawford Hill Laboratory, Holmdel, New Jersey, at 4080 Mc/s have yielded a value of about 3.5 K higher than expected. This excess temperature is, within the limits of our observations, isotropic, unpolarized, and free from seasonal variations (July, 1964 - April, 1965). A possible explanation for the observed excess noise temperature is the one given by Dicke, Peebles, Roll, and Wilkinson (1965) in a companion letter in this issue.