Low-Frequency Measurements of the CMB Spectrum

As part of an extended program to characterize the spectrum of the cosmic microwave background (CMB) at low frequencies, we have performed multiple measurements from a high-altitude site in California. On average, these measurements suggest a CMB temperature slightly lower than measurements at highe...

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Bibliographic Details
Main Authors: Kogut, A., Bensadoun, M., De Amici, Giovanni, Levin, S., Limon,M., Smoot, George F., Sironi, G., Bersanelli, M., Bonelli, G.
Language:unknown
Published: 2009
Subjects:
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
RELICT RADIATION
ASTROPHYSICS
LAWRENCE BERKELEY LABORATORY
Amundsen-Scott
South Pole
South pole
Online Access:http://www.osti.gov/servlets/purl/893048
https://www.osti.gov/biblio/893048
Description
Summary:As part of an extended program to characterize the spectrum of the cosmic microwave background (CMB) at low frequencies, we have performed multiple measurements from a high-altitude site in California. On average, these measurements suggest a CMB temperature slightly lower than measurements at higher frequencies. Atmospheric conditions and the encroachment of civilization are now significant limitations from our present observing site. In November 1989, we will make new measurements from the South Pole Amundsen-Scott Station at frequencies 0.82, 1.5, 2.5, 3.8, 7.5, and 90 GHz. We discuss recent measurements and indicate improvements possible from a polar observing site.

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