The cores of lobe-dominant quasars

Details The cores of lobe-dominant quasars The cores of lobe-dominant quasars

Feb 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...325l..21a&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 325, Feb. 15, 1988, p. L21-L23.

Astronomy and Astrophysics

Astronomy

16

Extragalactic Radio Sources, Infrared Sources (Astronomy), Quasars, Radio Jets (Astronomy), Synchrotron Radiation, Infrared Astronomy Satellite, Infrared Spectra, Very Large Array (Vla), Visible Spectrum

Scientific paper

Lobe-dominant radio quasars have quiescent infrared/optical spectra similar to those of radio-quiet quasars. The radio cores are thought to emit by the synchrotron mechanism, but the emission mechanisms in the infrared and optical are unknown. The IR could be the same component as the radio core, or it could be a separate component entirely. In the latter case the IR must arise from a different mechanism of from a separate location. This has been tested by observing the cores of all six lobe-dominant quasars detected by IRAS, at 6 cm, 2 cm, and 1.3 cm. A compact VLA array, and phase self-calibration were used to ensure that phase incoherence has not reduced the flux measurements. In three cases the radio core spectrum underpredicts the IR, showing that they are separate components. This disfavors the synchrotron hypothesis for the IR unless it can be argued that the radio emission arises in a different location. Beaming models do in fact suggest that the radio may arise slightly off-nucleus, in the base of a relativistic jet directed away from the observer.

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