Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...269..387p&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 269, June 15, 1983, p. 387-399.
Astronomy and Astrophysics
Astrophysics
14
Astronomical Photometry, Extragalactic Radio Sources, Very Long Base Interferometry, Astronomical Catalogs, Galactic Nuclei, Galactic Structure, Quasars, Red Shift, Statistical Analysis
Scientific paper
VLBI observations at 2.3 GHz with a baseline of approximately 8 x 10 to the 7th wavelengths were performed on a complete sample of 103 sources from the Parkes + or - 4 deg catalog. Compact milli-arcsec cores were found in 35 percent of all sources: in 80 percent of quasars, in 10 percent of galaxies, and in 20 percent of empty field sources. It is shown that for quasars the percentage of the source flux density coming from milli-arcsec cores increased with increasing radio spectral index, radio variability, and optical redness. It is noted that quasars with extended radio structure (not less than approximately 10 arcsec) seem more likely to have a detectable milli-arcsec core than do extended radio galaxies. The absence of a strong correlation between quasar milli-arcsec structure and redshift is found to be evidence for a lack of strong physical evolution in quasars.
Jauncey David L.
Morabito David D.
Preston A. R. A. R.
No associations
LandOfFree
A statistical VLBI study of milli-arcsecond cores in extragalactic radio sources does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with A statistical VLBI study of milli-arcsecond cores in extragalactic radio sources, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A statistical VLBI study of milli-arcsecond cores in extragalactic radio sources will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1504696