Evidence for cluster evolution from the theta-z relation

Details Evidence for cluster evolution from the theta-z relation Evidence for cluster evolution from the theta-z relation

Dec 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...234l..91h&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 234, Dec. 1, 1979, p. L91-L95.

Mathematics

Logic

12

Cosmology, Galactic Clusters, Galactic Evolution, Gravitational Effects, Astronomical Models, Friction Factor, Red Shift, Size (Dimensions)

Scientific paper

An analysis of the angular size-redshift relation for 99 clusters of galaxies indicates that evolution in the linear cluster sizes is required for agreement with physical cosmological models. Unless q0 is considerably greater than 1, the mean cluster size is decreasing a present with a time scale comparable to 1/H0. This effect, observed for both harmonic mean sizes and core radii, may be attributed to dynamical friction.

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