Fine Scale Structure of Quasars and Active Galactic Nuclei

Details Fine Scale Structure of Quasars and Active Galactic Nuclei Fine Scale Structure of Quasars and Active Galactic Nuclei

May 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...202.4304k&link_type=abstract

American Astronomical Society Meeting 202, #43.04; Bulletin of the American Astronomical Society, Vol. 35, p.762

Astronomy and Astrophysics

Astronomy

Scientific paper

We have used visibility data obtained with the VLBA at 15 GHz during the period 1994--2002 to examine the most compact structure in 160 flat-spectrum extragalactic radio sources. With projected baselines out to 440 million wavelengths we are able to study source structure on angular scales as small as 0.12 mas. For about 40% of the sources, at least at one epoch, more than a half of the flux density is unresolved on the longest baselines, and have dimensions less than 0.12 mas. About a half of the sample has fringe visibilities greater than 0.5 Jy at the longest baselines. The most variable sources tend to have the most compact structure. For more than a half of the sample, at least at one epoch, the structure appears unresolved along a direction transverse to its extension. Typical lower limits to the brightness temperature are in the range 1011 to 1012 K but extends up to 1013 K apparently in excess of the inverse Compton limit of stationary synchrotron sources. The fringe visibility of the gamma-ray loud AGN show, on average, higher values than for gamma-ray quiet AGN and is more variable. This suggests a common emission mechanism at radio and gamma-ray wavelengths.
Longer baselines, such as shall be available from future space VLBI missions, will be needed to study the most compact high brightness temperature regions in these sources.

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