Noncosmological signal contributions to the COBE DMR anisotropy maps

Details Noncosmological signal contributions to the COBE DMR anisotropy maps Noncosmological signal contributions to the COBE DMR anisotropy maps

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...414l..77b&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 414, no. 2, p. L77-L80.

Astronomy and Astrophysics

Astronomy

41

Anisotropy, Cosmic Background Explorer Satellite, Galactic Clusters, Microwave Radiometers, Relic Radiation, Compton Effect, Cross Correlation, Magellanic Clouds, Radio Sources (Astronomy), Sky Surveys (Astronomy)

Scientific paper

We examine the COBE Differential Microwave Radiometer (DMR) data for evidence of noncosmological source contributions. The DMR maps are cross-correlated with maps of rich clusters, extragalactic IRAS sources, HEAO 1 A-2 X-ray emission, and 5 GHz radio sources. We limit the rms contributions from these sources on a 7 deg angular scale to less than 10 micro-K (95 percent confidence level) in the DMR maps, although the LMC probably contributes about 50 micro-K to a limited region of the sky. Thus, our previous interpretation that the fluctuations in the COBE DMR data are most likely due to cosmic fluctuations at the surface of last scattering remains intact. The Comptonization parameter for hot electrons traced by rich clusters is limited to delta(y) less than 2 x 10 exp -6 (95 percent confidence level) averaged over the 7 deg DMR beam.

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