Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...108...85r&link_type=abstract
Astronomy and Astrophysics, vol. 108, no. 1, Apr. 1982, p. 85-88.
Astronomy and Astrophysics
Astrophysics
Cosmology, Hubble Constant, Quasars, Virgo Galactic Cluster, Anisotropy, Error Analysis, Galactic Clusters, Interstellar Extinction, Isotropy, Stellar Luminosity
Scientific paper
A sample of 334 quasars was selected in a study of anisotropy and its cause. Selection was based on radio spectral index. Assuming cosmological redshift of quasars, FRW cosmology as first order approximation and absence of bias, an improved experimental upper limit is given to a large scale dipole component anisotropy of H(0) as minus 20 percent, plus 25 percent. The slight anisotropy of the generalized Hubble modulus now seems to be confirmed in both its amplitude and direction. The modulus is at a minimum in the general direction of the Virgo cluster. The causes of this effect could be (1) an undetected selection bias or a systematic measuring error; (2) chance; (3) extragalactic extinction in superclusters; (4) real H(0) anisotropy; and (5) anisotropy of the luminosity of quasars.
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