Preliminary results from the COBE differential microwave radiometers - Large angular scale isotropy of the cosmic microwave background

摘要: Preliminary but precise micowave maps are presented of the sky, and thus early universe, derived as first results from Differential Microwave Radiometers experiment aboard COBE. The dipole anisotropy attributed to motion solar system with respect CMB reference frame shows strongly in all six sky is consistent a Doppler-shifted thermal spectrum. best-fitted has amplitude 3.3 + or - 0.2 mK direction (alpha, delta) = 11.2 h h, -7 deg 2 (J2000) (l,b) 265 deg, 48 deg. There no clear evidence for any other large angular-scale feature. Limits on Delta T/T0 3 x 10 -5th (T0 2.735 K), 4 -5th, found rms quadrupole amplitude, monochromatic fluctuations, Gaussian respectively. These measurements place most severe constraints date many potential physical processes universe. 25 refs.