Low-frequency measurements of the CMB (cosmic microwave background) spectrum

Conference · Sun Oct 01 00:00:00 EDT 1989

OSTI ID:6830781

Kogut, A; Bensadoun, M; De Amici, G; Levin, S; Limon, M; Smoot, G ^[1]; Sironi, G ^[2]; Bersanelli, M; Bonelli, G ^[3]

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1. Lawrence Berkeley Lab., CA (USA)
2. Milan Univ. (Italy). Dipt. di Fisica
3. Consiglio Nazionale delle Ricerche, Milan (Italy)

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 Amnudsen-Scott Station at frequencies 0.82 1.5, 2.5, 3.8, 7.5, and 90 GHz. We discuss recent measurements and indicate improvements from a polar observing site. 11 refs., 2 figs.

• Research Organization: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: DOE/ER; National Science Foundation (NSF)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 6830781
• Report Number(s): LBL-28024; CONF-8906234-2; ON: DE90011589; CNN: DPP-8716548
• Resource Relation: Conference: Workshop on astrophysics in Antarctica, Newark, DE (USA), 8-10 Jun 1989
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
47 OTHER INSTRUMENTATION
COSMIC RADIATION
MEASURING METHODS
BACKGROUND RADIATION
FREQUENCY DEPENDENCE
MICROWAVE RADIATION
SPECTRA
TEMPERATURE DEPENDENCE
ELECTROMAGNETIC RADIATION
IONIZING RADIATIONS
RADIATIONS
Astrophysics
Cosmology
Cosmic Radiation
640101* - Astrophysics & Cosmology- Cosmic Radiation
440800 - Miscellaneous Instrumentation- (1990-)