The optical continua of extragalactic radio jets

Details The optical continua of extragalactic radio jets The optical continua of extragalactic radio jets

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...329..532k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 329, June 15, 1988, p. 532-550.

Astronomy and Astrophysics

Astronomy

82

Active Galactic Nuclei, Astronomical Photometry, Color Photography, Extragalactic Radio Sources, Quasars, Radio Jets (Astronomy), Centimeter Waves, Radio Emission, Synchrotron Radiation

Scientific paper

Optical images in several passbands are used to study the spectral energy distributions in the continua of a number of extragalactic radio jets. In all cases, the spectrum shows a strong turnover below the extrapolated low-frequency power law. The turnovers are well-fitted by a simple synchrotron model in which the electron energy distribution is sharply truncated, typically at gamma of about 100,000. Image restoration is used to examine the structure of the M87 jet at subarcsec scales and to separate various structures for spectral-index measurements. There is a systematic drop in turnover frequency going outward along the jet, broken only by unusually high values for knots A and E. The optical and radio structures are everywhere the same at the 0.3 arcsec level, suggesting magnetic constraints on particle motion on scales of about 30 pc.

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