Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...413..453n&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 413, no. 2, p. 453-476.
Astronomy and Astrophysics
Astronomy
59
Radio Sources (Astronomy), Red Shift, Size Determination, Stellar Luminosity, Stellar Magnitude, Astronomical Catalogs, Flux Density, Radio Astronomy
Scientific paper
We review the data on the angular sizes of double radio sources. There is a positive correlation between the true radio source size and radio power among low-luminosity radio galaxies. This may be partly explained through sample selection effects. There is a negative correlation between radio size and power among high luminosity radio galaxies and all quasars. It follows the constant total energy envelope closely. There is no significant difference between the radio sizes of radio galaxies and quasars of the same luminosity. However, it is possible that real differences in the radio sizes of the two populations are hidden by selection effects in our sample. The angular size-redshift diagram shows a deficiency of large radio sources at high redshifts which is fully explained by the above-mentioned negative correlation without need for cosmic evolution of radio source size. However, the possibility of some cosmic evolution is not totally ruled out by the data.
Jaakkola Toivo
Kotilainen Jari
Nilsson Kim K.
Valtonen Mauri J.
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