The broad-band spectra and variability of compact nonthermal sources

Details The broad-band spectra and variability of compact nonthermal sources The broad-band spectra and variability of compact nonthermal sources

Jan 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...243...97j&link_type=abstract

Astrophysical Journal, Part 1, vol. 243, Jan. 1, 1981, p. 97-107. Research supported by the University of Minnesota

Astronomy and Astrophysics

Astronomy

47

Extragalactic Radio Sources, Infrared Astronomy, Nonthermal Radiation, Radio Spectra, Spectral Line Width, Energy Spectra, Galactic Nuclei, Infrared Spectra, Millimeter Waves, Variability, Visible Spectrum

Scientific paper

It is noted that in approximately a dozen sources, nearly simultaneous infrared and/or visual spectra are available, making it possible to examine the relationship between the infrared-visual and radio regimes. A simple transition to the steeper infrared spectra is seen as likely with a mean break wavelength of approximately 300 microns in the rest frame. These observations indicate a tapered source geometry, with the smallest structures roughly on the order of 10 to the 16th cm as estimated from the spectral break; this is consistent with scales estimated from optical variability time scales. Large amplitude variations on a six-month time interval are found to be fairly infrequent in most of the sources. A relatively model-independent way of categorizing flux variations as due to changes in source scale, or structure or the slope of the electron energy spectrum is suggested.

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