Radio source orientation and the angular diameter-redshift relation

Details Radio source orientation and the angular diameter-redshift relation Radio source orientation and the angular diameter-redshift relation

Aug 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...377...36o&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 377, Aug. 10, 1991, p. 36-38.

Astronomy and Astrophysics

Astrophysics

5

Extragalactic Radio Sources, Galactic Structure, Quasars, Red Shift, Angular Correlation, Line Of Sight, Radio Galaxies

Scientific paper

The effect of a nonrandom source orientation on the angular diameter-redshift relation was considered for the 3CR sample of Laing et al., based on the 'unified' scheme of Barthel. For an inhomogeneous sample of objects displaying milliarcsecond scale structure, it was found that there was no evidence for a systematic variation for orientation angle with redshift. However, if it was assumed that quasars are closer to the line of sight than powerful extended radio galaxies, then the observed angular size-redshift relation could be interpreted in terms of source orientation, rather than linear size evolution.

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