VLBI observations of the quasars CTD20 (0234+285), OJ248 (0827+243), and 4C19.44 (1354+195), and the millimeter-X-ray connection

Details VLBI observations of the quasars CTD20 (0234+285), OJ248 (0827+243), and 4C19.44 (1354+195), and the millimeter-X-ray connection VLBI observations of the quasars CTD20 (0234+285), OJ248 (0827+243), and 4C19.44 (1354+195), and the millimeter-X-ray connection

Jun 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983aj.....88..759m&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 88, June 1983, p. 759-763. Research supported by the Virginia Polytechnic Institute

Astronomy and Astrophysics

Astronomy

9

Quasars, Radiant Flux Density, Radio Astronomy, Very Long Base Interferometry, X Ray Astronomy, Astronomical Models, Millimeter Waves, Red Shift, Tables (Data)

Scientific paper

The authors have obtained limited VLBI data on the quasars CTD20, OJ248, and 4C 19.44 at 2.8 cm. CTD20 was also observed at 6 and 18 cm. All three sources contain multicomponent structure, and rather large fractions of the 2.8-cm flux densities arise in unresolved regions. All of the radio flux density of CTD20 originates in compact components. 4C 19.44 is dominated at low frequencies by a steep-spectrum component which exceeds about 7 mas in size. Above 2 GHz the spectrum is flat and variable owing to several compact components. CTD20 and OJ248 belong to a sample of millimeter-excess quasars which were shown by Owen, Helfand, and Spangler to have highly predictable ratios of 90 GHz to 2-keV flux densities. A synchrotron origin of the radio-to-X-ray emission requires that any variations in the radio should be time delayed relative to the X-ray.

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