Cosmic microwave background and Galactic quadrupoles in the millimetric region

Details Cosmic microwave background and Galactic quadrupoles in the millimetric region Cosmic microwave background and Galactic quadrupoles in the millimetric region

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...382..515d&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 382, Dec. 1, 1991, p. 515-522. Research supported by MURST and ASI.

Astronomy and Astrophysics

Astrophysics

8

Galactic Radiation, Milky Way Galaxy, Relic Radiation, Anisotropy, Astronomical Models, Cosmic Background Explorer Satellite, Cosmic Dust, Dark Matter, Millimeter Waves

Scientific paper

The constraints that a COBE-DMR-like experiment can set on the CMB quadrupole anisotropy, once that Galactic emission and receiver noise are taken into account, are discussed. A simple model is used for describing the diffuse emission of the Galaxy at millimeter wavelengths, and it is estimated that the minimum Galactic quadrupole occurs at 3-4 mm, with an amplitude about 50 micro-K. The CMB quadrupole turns out to be limited in sensitivity mostly by detector noise and much less by Galactic contamination. At the expected level of sensitivity, COBE should be able to set a very conservative upper limit to the rms CMB quadrupole of about 80 micro K. This upper limit would be fatal for open pure baryonic, fully ionized universes, with a primordial spectral index n = -1. In flat, biased, cold dark matter models, a fraction less than about 50 percent of the cosmic observers should detect a CMB quadrupole anisotropy.

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