Five years monitoring of extragalactic radio sources. II - Quiescent spectra and the evolution of outbursts

Details Five years monitoring of extragalactic radio sources. II - Quiescent spectra and the evolution of outbursts Five years monitoring of extragalactic radio sources. II - Quiescent spectra and the evolution of outbursts

Sep 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...203....1v&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 203, no. 1, Sept. 1988, p. 1-20. Research supported by the Academy of Finland.

Astronomy and Astrophysics

Astrophysics

97

Extragalactic Radio Sources, Quasars, Radio Observation, Stellar Spectra, Variable Stars, Centimeter Waves, Energy Dissipation, High Frequencies, Millimeter Waves, Stellar Flares

Scientific paper

Using a sample of 27 radio sources extensively observed at centimeter and millimeter wavelengths, the spectral shape has been separately determined, for the first time, for the quiescent emission components and for flares in these sources. The quiet-level spectra can be decomposed into contributions from knots and other steep-spectrum extended components, and from a compact core which dominates at higher frequencies. All the outburst spectra can be fitted with the same shape, that of a simple, homogeneous, self-absorbed source with alpha(thick) = + 2.5 and alpha(thin) of roughly - 0.2. This shape persists throughout the development of the outbursts, the only exception being a possible late steepening of the thin spectra, indicative of energy losses. The simple spectral shape and the overall evolution of the flares fit well with a model where the flares result from shocks in an adiabatic, relativistic jet.

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