Measurements of anisotropy in the cosmic microwave background radiation at degree angular scales near the stars Sigma Herculis and IOTA Draconis

Details Measurements of anisotropy in the cosmic microwave background radiation at degree angular scales near the stars Sigma Herculis and IOTA Draconis Measurements of anisotropy in the cosmic microwave background radiation at degree angular scales near the stars Sigma Herculis and IOTA Draconis

Oct 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...433l..57c&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 433, no. 2, p. L57-L60

Astronomy and Astrophysics

Astronomy

42

Anisotropy, Background Radiation, Big Bang Cosmology, Radio Astronomy, Relic Radiation, Centimeter Waves, Cosmic Dust, Decimeter Waves, Radio Spectra, Superhigh Frequencies, Ultrahigh Frequencies

Scientific paper

We present results from two four-frequency observations centered near the stars Sigma Herculis and Iota Draconis during the fourth flight of the Millimeter-wave Anisotropy eXperiment (MAX). The observations were made of 6 deg x 0.6 deg strips of the sky with a 1.4 deg peak to peak sinusoidal chop in all bands. The full width at half maximum (FWHM) beam sizes were calculated 0.55 deg +/- 0.05 deg at 3.5/cm and a 0.75 deg +/- 0.05 deg at 6, 9, and 14/cm. Significant correlated structures were observed at 3.5, 6, and 9/cm. The spectra of these signals are inconsistent with thermal emission from known interstellar dust populations. The extrapolated amplitudes of synchrotron and free-free emission are too small to account for the amplitude of the observed structures. If the observed structures are attributed to cosmic microwave background (CMB) anisotropy with a Gaussian autocorrelation function and a coherence angle of 25 min, then the most probable values at Delta T/TCMB = 3.1 +1.7-1.3x 10-5 for the Sigma Herculis scan, and Delta T/TCMB = 3.3+1.1-1.1 x 10-5 for the Iota Draconis scan (95% confidence upper, lower limits).

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