Superluminally expanding radio sources and the radio-quiet QSOs

Details Superluminally expanding radio sources and the radio-quiet QSOs Superluminally expanding radio sources and the radio-quiet QSOs

Jan 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979natur.277..182s&link_type=abstract

Nature, vol. 277, Jan. 18, 1979, p. 182-185.

Astronomy and Astrophysics

Astronomy

339

Astronomical Models, Extragalactic Radio Sources, Quasars, Relativistic Velocity, High Frequencies, Velocity Distribution, Very Long Base Interferometry, Visual Observation

Scientific paper

A model of apparent superluminal expansion based on straightforward relativistic motion is proposed, according to which the radio-emitting objects are ejected often or continually, but by no means steadily, along one axis, so that there is always some radio emission close to a QSO, but all the radio emitters on the approaching side are moving with similar velocities. The nature of this model is defined, the required ratio between the total numbers of optical QSOs and quasi-stellar radio sources is computed, and the apparent-velocity distribution in a radio-selected sample is examined. The problem of compact central sources associated with large classical doubles is considered. It is suggested that the proposed model may provide a link between the relatively slow evolution of both flat-spectrum quasars and weak radio sources.

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