Spectral plane quasars, spectral turn-over, and frequency atlas

Details Spectral plane quasars, spectral turn-over, and frequency atlas Spectral plane quasars, spectral turn-over, and frequency atlas

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989ipespreptr....r&link_type=abstract

M.S. Thesis, 1988 Instituto de Pesquisas Espaciais, Sao Jose dos Campos (Brazil).

Mathematics

Logic

Bl Lacertae Objects, Cosmology, Evolution (Development), Luminosity, Quasars, Spectrum Analysis, Energy Spectra, Frequencies, Radio Telescopes

Scientific paper

A sample of 44 quasars and 5 BL Lac objects were observed at 22 and 43 GHz with the 13.7 m Itapetinga Radio telescope. From the analysis of the obtained spectra, it was possible to determine the approximate turn-over for 46 sources. Assuming that at frequencies higher than the turn-over the spectrum arises from with the optically thin region of a very compact component, it was possible to set up correlations between structural and energetic characteristics of these regions. The results are compatible with a cosmological evolution of the luminosities of compact regions, although there is no evolution in their sizes.

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