Multifrequency observations of blazars. II - The variability of the 1 micron to 2 MM continuum

Details Multifrequency observations of blazars. II - The variability of the 1 micron to 2 MM continuum Multifrequency observations of blazars. II - The variability of the 1 micron to 2 MM continuum

May 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...304..295g&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 304, May 1, 1986, p. 295-304.

Astronomy and Astrophysics

Astrophysics

55

Astronomical Spectroscopy, Bl Lacertae Objects, Blazars, Continuous Spectra, Infrared Spectra, Periodic Variations, Radio Spectra, Electron Acceleration, Millimeter Waves, Quasars, Radiant Flux Density, Spectral Energy Distribution, Tables (Data)

Scientific paper

The results of monitoring, over a period of two years, a sample of 12 blazars, in 11 wave bands between 1 micron and 2 mm are presented. All sources exhibit some variability, both in flux density and spectral shape. The infrared variability is consistent with repeated injections of reaccelerations of electrons, which subsequently suffer radiative losses. For OJ 287, 3C 279, and 3C 345, a decay and steepening of the infrared spectrum occurred as the submillimeter turnover evolved to lower frequencies, consistent with expansion of the emitting region. The peak flux, however, increased during this evolution. This behavior is inconsistent with most models for compact extragalactic sources, but it is naturally explained by shock waves traveling in an adiabatically expanding relativistic jet (Marscher and Gear, 1985).

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