Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...143..231r&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 143, no. 1, Feb. 1985, p. 231, 232.
Astronomy and Astrophysics
Astronomy
Radio Sources (Astronomy), Radio Spectra, Synchrotron Radiation, Extragalactic Radio Sources, Optical Thickness, Relativistic Electron Beams
Scientific paper
The true shape of the power law describing the intensity behavior of extragalactic radio sources at lower frequencies of optically thin synchrotron emissions is discussed. Inclusion of emission frequencies below the critical frequency has been found to yield a spectrum that never decreases in intensity below a cube root rate. Spectra which do decrease faster cannot arise from thin synchrotron radiation emission by ultrarelativistic electrons. In that case, e.g., the smaller-than 0.5 arcsec source of the high flux density of 3C 147, an optically thick model may be more effective.
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