Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...202..596b&link_type=abstract
Astrophysical Journal, vol. 202, Dec. 15, 1975, pt. 1, p. 596-602.
Astronomy and Astrophysics
Astrophysics
59
Extragalactic Radio Sources, Pulsars, Radio Spectra, Synchrotron Radiation, Electron Distribution, Energy Distribution, Radiation Absorption, Radio Galaxies, Statistical Analysis, Stellar Luminosity
Scientific paper
A statistically complete sample of 100 extragalactic sources stronger than 2 Jy at 1400 MHZ was observed on a 3.5 million wavelength baseline at 430 MHz. The unresolved pulsar AP 2016 was used to normalize the fringe visibilities, with the result that all extragalactic sources appear at least partially resolved. In general, sources with flat spectra show fringes, while steep-spectrum sources do not, confirming that flat spectra are produced by synchrotron self-absorption rather than unusual electron-energy distributions. The spectral index-luminosity relation for radio galaxies is shown to reflect differing electron-energy distributions rather than self-absorption. Nearly all quasars, even those with steep spectra, contain components brighter than 10 billion K. Purely radio 'identifications', made by calling fully resolved sources galaxies and sources showing fringes quasars, agree with 80 per cent of the available optical identifications.
Broderick John J.
Condon James J.
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