Angular diameters of quasars and cosmology

Journal Article · Sat Sep 01 04:00:00 EDT 1973 · Astrophys. Lett., v. 15, no. 1, pp. 27-33

OSTI ID:4362942

van der Kruit, P C

A critical discussion is given of the inferences drawn from the angular diameter distribution of quasars. Further evidence is given that the distribution with redshift is compatible with evolving universes with physical diameter evolution. The apparent gap in the linear size distribution around 200 kpc might very well be caused by observational effects. Rowan-- Robinson' s proposition that some quasars are local is examined. It rests mainly on the uniform V/V-- distribution for small-diameter 3CR quasars and their association with peculiar galaxies and Zwicky clusters. It is found that compactness'' of the radio spectra is a better criterion than linear size and that the V/V/sub m/ distribution is uniform for a 3CR sample only with respect to its optical and radio detection limits. Associations of extragalactic 3CR sources with Zwicky clusters show a random'' distribution for quasars. Compact quasars are not significantly members of Arp's pairs across galaxies. There is as yet no convincing evidence from the angular diameters of quasars that some of them are not cosmological. (auth)

• Research Organization: Hale Observatories, Pasadena, CA
• NSA Number: NSA-29-016545
• OSTI ID: 4362942
• Journal Information: Astrophys. Lett., v. 15, no. 1, pp. 27-33, Journal Name: Astrophys. Lett., v. 15, no. 1, pp. 27-33; ISSN ASTLA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

*COSMOLOGY-- QUASARS
*QUASARS-- SIZE
DOPPLER EFFECT
GALAXIES
N56300* --Physics (Astrophysics & Cosmology)--Quasi-stellar
Radio & X-Ray Sources