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

Gear, Walter Kieran, Brown, L. M. J., Robson, E. I., Ade, Peter A. R., Griffin, Matthew Jospeh, Smith, M. G., Nolt, I. G., Radostitz, J. V., Veeder, G. and Lebofsky, L. 1986. Multifrequency observations of blazars. II - The variability of the 1 micron to 2 MM continuum. Astrophysical Journal 304 , pp. 295-304. 10.1086/164163

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Abstract

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).

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Uncontrolled Keywords: 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)
Publisher: American Astronomical Society
ISSN: 0004-637X
Last Modified: 04 Jun 2017 02:12
URI: http://orca-mwe.cf.ac.uk/id/eprint/10925

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