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Title:
Measurements of anisotropy in the cosmic microwave background radiation at 0.5 deg angular scales near the star gamma ursae minoris
Authors:
Devlin, M. J.; Clapp, A. C.; Gundersen, J. O.; Hagmann, C. A.; Hristov, V. V.; Lange, A. E.; Lim, M. A.; Lubin, P. M.; Mauskopf, P. D.; Meinhold, P. R.; Richards, P. L.; Smoot, G. F.; Tanaka, S. T.; Timbie, P. T.; Wuensche, C. A.
Affiliation:
AA(University of Calif., Berkeley, CA, US), AB(University of Calif., Berkeley, CA, US), AC(University of Calif., Santa Barbara, CA, US), AD(University of Calif., Santa Barbara, CA, US), AE(University of Calif., Berkeley, CA, US), AF(University of Calif., Berkeley, CA, US), AG(University of Calif., Santa Barbara, CA, US), AH(University of Calif., Santa Barbara, CA, US), AI(University of Calif., Berkeley, CA, US), AJ(University of Calif., Berkeley, CA, US)
Publication:
The Astrophysical Journal, Part 2 - Letters, vol. 430, no. 1, p. L1-L4 (ApJL Homepage)
Publication Date:
07/1994
Category:
Astronomy
Origin:
STI
NASA/STI Keywords:
Background Radiation, Cosmology, Microwave Emission, Microwave Spectra, Relic Radiation, Anisotropic Media, Balloon-Borne Instruments, Cosmic Noise, Error Analysis, Instrument Errors, Millimeter Waves
DOI:
10.1086/187423
Bibliographic Code:
1994ApJ...430L...1D

Abstract

We present results from a four-frequency observation of a 6 deg x 0.6 deg strip of the sky centered near the star Gamma Ursae Minoris (GUM) during the fourth flight of the Millimeter-wave Anistropy experiment(MAX). The observation was made with a 1.4 deg peak-to-peak sinusoidal chop in all bands. The FWHM beam sizes were 0.55 deg +/- 0.05 deg at 3.5 per cm and 0.75 deg +/- 0.05 deg at 6, 9, and 14 per cm. During this observation significant correlated structure was observed at 3.5, 6 and 9 per cm with amplitudes similar to those observed in the GUM region during the second and third fligts of MAX. The frequency spectrum is consistent with cosmic microwave background (CMB) and inconsistent with thermal emission from interstellar dust. The extrapolated amplitudes of synchrotron and free-free emission are too small to account for the amplitude of the observed structure, If all of the structure is attributed to CMB anisotropy with a Gaussian autocorrelation function and a coherence angle of 25 min, then the most probable values of delta T/TCMB in the 3.5, 6 and 9 per cm bads are (4.3 +2.7/-1.6) x 10-5, 2.8 (+4.3/-1/1) x 10-5, and 3.5 (+3.0/-1.6) x 10-5 (95% confidence upper and lower limits), respectively.

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