Optical dipole anisotropy

Details Optical dipole anisotropy Optical dipole anisotropy

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.225..213l&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 225, March 1, 1987, p. 213-220.

Astronomy and Astrophysics

Astronomy

71

Anisotropy, Astronomical Maps, Dipole Moments, Galactic Structure, Mass Distribution, Visible Spectrum, Relic Radiation

Scientific paper

The large-scale distribution of light is illustrated by maps of about 15000 optical galaxies. The maps are based on the UGC, ESO and MCG catalogues. The combined catalogue has an isophotal diameter limit and covers the entire sky, except for obscured regions. The dipole anisotropy in the galaxy distribution points towards l = 227°±23°, b = 42°±8°, a direction which is not sensitive to Galactic obscurations. The optical dipole is about 37° from the microwave background radiation dipole and about 10° from the IRAS dipole. The rough alignment of the three dipoles suggests that light traces mass. The average depth of the catalogue is estimated to be 50 h-1Mpc (where H0 = 100 h km s-1Mpc-1) and the density parameter is roughly Ω0 ≈ 0.3.

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