Radio and optical observations of optically weak, steep-spectrum, compact radio sources

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astronomical Spectroscopy, Emission Spectra, Infrared Astronomy, Radio Sources (Astronomy), Visual Photometry, Charge Coupled Devices, Compton Effect, Radiant Flux Density, Radio Emission, Very Long Base Interferometry

Scientific paper

The previous interpretation of the radio size and spectrum of several steep-spectrum, compact, optically weak radio sources in terms of a stationary synchrotron model predicted substantially more inverse Compton optical emission than was observed. This paper presents extensive optical and radio observations which reveal a more complex structure than was assumed in the previous analysis. A more conservative analysis suggests that current data are consistent with a standard synchrotron model with relativistic bulk motions not exceeding those needed to explain apparent superluminal motions in other sources.

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