Very-Long-Baseline Radio Interferometry Surveys of the Compact Structure in Active Galactic Nuclei

Details Very-Long-Baseline Radio Interferometry Surveys of the Compact Structure in Active Galactic Nuclei Very-Long-Baseline Radio Interferometry Surveys of the Compact Structure in Active Galactic Nuclei

Dec 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995pnas...9211342w&link_type=abstract

Proceedings of the National Academy of Sciences of the United States of America, Volume 92, Issue 25, pp. 11342-11347

Mathematics

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7

Scientific paper

Very-long-baseline radio interferometry (VLBI) imaging surveys have been undertaken since the late 1970s. The sample sizes were initially limited to a few tens of objects but the snapshot technique has now allowed samples containing almost 200 sources to be studied. The overwhelming majority of powerful compact sources are asymmetric corejects of one form or another, most of which exhibit apparent superluminal motion. However 5-10% of powerful flat-spectrum sources are 100-parsec (pc)-scale compact symmetric objects; these appear to form a continuum with the 1-kpc-scale double-lobed compact steep-spectrum sources, which make up 15-20% of lower frequency samples. It is likely that these sub-galactic-size symmetric sources are the precursors to the large-scale classical double sources. There is a surprising peak around 90^circ in the histogram of misalignments between the dominant source axes on parsec and kiloparsec scales; this seems to be associated with sources exhibiting a high degree of relativistic beaming. VLBI snapshot surveys have great cosmological potential via measurements of both proper motion and angular size vs. redshift as well as searches for gravitational "millilensing."

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