The magnitude-redshift relation in a locally inhomogeneous universe

Details The magnitude-redshift relation in a locally inhomogeneous universe The magnitude-redshift relation in a locally inhomogeneous universe

Nov 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...239...29w&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 239, no. 1-2, Nov. 1990, p. 29-32. Research supported by the Chinese Academy o

Statistics

Computation

3

Computational Astrophysics, Gravitational Lenses, Red Shift, Universe, Astronomical Models, Luminosity, Magnitude, Photons, Quasars

Scientific paper

The question of modification of the magnitude-redshift relation in a locally inhomogeneous universe is reconsidered. It is shown that, although the conservation of photon flux requires that the luminosity distance in both a standard cosmological model and a locally inhomogeneous universe be statistically equal, this does not require the apparent magnitude in the two cases have the same average value. Based on point model approximations for inhomogeneities and background sources, the correction to the magnitude-redshift relation is computed for cosmological model with density = 1 and smoothness = 0. It is pointed out that the correction is of significance for the number counts of quasars, as well as the measurement of deceleration parameter q(0).

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