Measurements of the anisotropy of the cosmic background radiation at 0°.5 scale near the star μ Pegasi

P. Meinhold, A. Clapp, M. Devlin, M. Fischer, J. Gundersen, W. Holmes, A. Lange, P. Lubin, P. Richards, G. Smoot

Research output: Contribution to journalArticlepeer-review

59 Scopus citations


Results are presented from the third flight of the MAX experiment, an attitude-controlled balloon-borne millimeter-wave telescope with a 0°.5 beam, a 1° chop, and a three-channel bolometric photometer. Several hours of high-quality data were obtained during a flight on 1991 June 5, including long integrations to search for CBR anisotropy, two separate measurements of dust in the Galactic plane, a brief scan of the Coma Cluster to search for the Sunyaev-Zel'dovich (SZ) effect, and a number of important systematic tests. Data from one of the long CBR integrations, carried out in a region of sky near the star Mu Pegasi, are presented. The primary structure in the data is shown to be emission from Galactic dust via its spectrum and correlation with the IRAS 100 μm map. Several approaches are used to fit this dust component and remove it from the data. An upper limit to CBR anisotropy of ΔT/T < 2.5 × 10-5 is obtained for a Gaussian autocorrelation function with coherence angle θC = 25′. This limit is significantly higher than the measurement sensitivity of ΔT/T ≈ 1 × 10-5 due to the presence of residual structure in the data after removal of the dust component.

Original languageEnglish (US)
Pages (from-to)L1-L4
JournalAstrophysical Journal
Issue number1 PART 2
StatePublished - May 20 1993
Externally publishedYes


  • Cosmic microwave background
  • Dark matter
  • Large-scale structure of universe

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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