Other
Scientific paper
Jun 1971
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1971natur.231..516h&link_type=abstract
Nature, Volume 231, Issue 5304, pp. 516-518 (1971).
Other
48
Scientific paper
THE 3 K background radiation provides a frame of reference equivalent to that defined by the matter by which it was last scattered. Conservative estimates place this last scattering at a redshift of z = 7 while others range up to redshifts of 1,000 or so1,2. Motion of the Earth relative to this extremely distant reference frame can be measured by observing the 24 h anisotropy in the 3 K background. If we assume no intrinsic anisotropy in the radiation, then a velocity of the Earth v would result in a temperature distribution where T 0 is the average background temperature and θ is the angle between v and the direction of observation3. Thus a temperature anisotropy of 10-3 K (1 mK) corresponds to a speed of ~100 km s-1. Previous efforts to measure this anisotropy have yielded only the component in the Earth's equatorial plane4,5. The most precise result to date is that obtained by Conklin, who reports an equatorial component of 1.9+/-0.8 mK directed toward 10 h right ascension. (This result (unpublished) is based in part on data obtained after publication of ref. 5.) The experiment described here is an attempt to determine the right ascension, declination and magnitude of the Earth's velocity vector by measuring the 24 h anisotropy in the cosmic background.
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