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Preliminary results from the COBE differential microwave radiometers - Large angular scale isotropy of the cosmic microwave background
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1991
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The COBE Differential Microwave Radiometers produced the first precise microwave sky maps, providing a detailed view of the early universe. The maps revealed a dipole anisotropy of 3.3 mK consistent with solar‑system motion, no other large‑scale features, and set ΔT/T0 limits of 3×10⁻⁵–4×10⁻⁵, imposing tight constraints on early‑universe physics. Published in The Astrophysical Journal (April 1991, DOI 10.1086/185988).
view Abstract Citations (225) References (22) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Preliminary Results from the COBE Differential Microwave Radiometers: Large Angular Scale Isotropy of the Cosmic Microwave Background Smoot, G. F. ; Bennett, C. L. ; Kogut, A. ; Aymon, J. ; Backus, C. ; de Amici, G. ; Galuk, K. ; Jackson, P. D. ; Keegstra, P. ; Rokke, L. ; Tenorio, L. ; Torres, S. ; Gulkis, S. ; Hauser, M. G. ; Janssen, M. A. ; Mather, J. C. ; Weiss, R. ; Wilkinson, D. T. ; Wright, E. L. ; Boggess, N. W. ; Cheng, E. S. ; Kelsall, T. ; Lubin, P. ; Meyer, S. ; Moseley, S. H. ; Murdock, T. L. ; Shafer, R. A. ; Silverberg, R. F. Abstract Preliminary but precise micowave maps are presented of the sky, and thus of the early universe, derived as the first results from the Differential Microwave Radiometers experiment aboard COBE. The dipole anisotropy attributed to the motion of the solar system with respect to the CMB reference frame shows strongly in all six sky maps and is consistent with a Doppler-shifted thermal spectrum. The best-fitted dipole has amplitude 3.3 + or - 0.2 mK in the direction (alpha, delta) = 11.2 h + or - 0.2 h, -7 deg + or - 2 deg (J2000) or (l,b) = 265 deg + or - 2 deg, 48 deg + or - 2 deg. There is no clear evidence in the maps for any other large angular-scale feature. Limits on Delta T/T0 of 3 x 10 to the -5th (T0 = 2.735 K), 4 x 10 to the -5th, and 4 x 10 to the -5th are found for the rms quadrupole amplitude, monochromatic fluctuations, and Gaussian fluctuations, respectively. These measurements place the most severe constraints to date on many potential physical processes in the early universe. Publication: The Astrophysical Journal Pub Date: April 1991 DOI: 10.1086/185988 Bibcode: 1991ApJ...371L...1S Keywords: Background Radiation; Cosmic Rays; Cosmology; Microwaves; Universe; Cosmic Background Explorer Satellite; Microwave Radiometers; Milky Way Galaxy; Space Radiation; COSMIC BACKGROUND RADIATION; COSMOLOGY; EARLY UNIVERSE full text sources ADS |