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Radio Physics and Radio Astronomy

ISSN Imprimir: 2152-274X
ISSN On-line: 2152-2758

Archives: Volume 1, 2010 to Volume 3, 2012

Radio Physics and Radio Astronomy

DOI: 10.1615/RadioPhysicsRadioAstronomy.v3.i3.40
pages 215-221

PHYSICAL PARAMETERS OF RADIO SOURCES WITH STEEPLY RISING DECAMETER WAVELENGTH SPECTRA

A. P. Miroshnichenko
Institute of Radio Astronomy, National Academy of Sciences of Ukraine, 4, Chervonopraporna St., Kharkiv, 61002

RESUMO

A sample of extragalactic objects with spectral index magnitudes α ≥ 1, which have been taken from the UTR-2 catalog, is used to analyze the radio sources characterized at decameter wavelengths by a steep rise of their spectra (known as spectral type C+). In the framework of the ΛCDM model of the Universe, luminosities of the galaxies and quasars belonging to the sample have been estimated for the decameter, centimeter, and optical wave ranges, and estimates obtained for magnetic field strengths, linear sizes and characteristic ages of the objects. Similar to the sources which show steep linear spectra (spectral type S), the galaxies and quasars with type C+ spectra show high values of the radio luminosity and an extended structure at radio frequencies. A relation has been established between linear sizes of the type C+ sources and their low frequency luminosities. A significant cosmological evolution of luminosity has been revealed for the sources considered.


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