Null influence of possible local extragalactic perturbations on tests of redshift-distance laws

Details Null influence of possible local extragalactic perturbations on tests of redshift-distance laws Null influence of possible local extragalactic perturbations on tests of redshift-distance laws

Nov 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...115..398n&link_type=abstract

Astronomy and Astrophysics, vol. 115, no. 2, Nov. 1982, p. 398-403.

Astronomy and Astrophysics

Astrophysics

12

Cosmology, Distance, Galaxies, Red Shift, Statistical Analysis, Virgo Galactic Cluster

Scientific paper

A summary analysis of the possible influence on low-redshift cosmological tests of several perturbations in local extragalactic dynamics is presented. The question of whether one or more of these perturbations, when superimposed on a linear redshift-distance law, could appear observationally as a quadratic law is studied systematically. The correction of the observed redshift for a given motion of the point of observation with respect to the ensemble of observed galaxies is discussed, as is the estimation of the effect of peculiar motions on the Hubble law. The use of the new statistical ROBUST procedure to analyze the redshift-magnitude relations of galaxies within the supergalactic regions specified as dynamically relatively homogeneous by the supercluster hypothesis and thus stringently test the quadratic law is discussed. Remarkably good results for the procedure are found that are insensitive to the choice of criterion and include the effects of motions and the estimate of best-fitting motion.

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