The synchrotron spectra of radio hot spots

Details The synchrotron spectra of radio hot spots The synchrotron spectra of radio hot spots

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...219...63m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 219, no. 1-2, July 1989, p. 63-86.

Astronomy and Astrophysics

Astronomy

174

Astronomical Spectroscopy, Radio Galaxies, Synchrotron Radiation, Emission Spectra, Infrared Photometry, Particle Acceleration, Radio Jets (Astronomy)

Scientific paper

Observations in the optical, near-IR, mm-wave, and radio bands for bright radio hot-spots in classical double radio sources are used to constrain the synchrotron spectra of radio hot spots in the 10 to the 9th-10 to the 15th Hz frequency range. It is found that five out of six hot spot spectra exhibit a high-frequency cutoff at a frequency not higher than 2 x 10 to the 14th Hz. Model fits to the data show that the typical LF spectrum is flat, in agreement with the prediction of first-order Fermi acceleration. A spectral break noted in half of the cases is demonstrated to be due to synchrotron losses within the hot spot emission regions. The minimum-energy estimate of the hot spot magnetic fields is independently confirmed.

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