The integrated radio spectrum of Virgo A


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Resumo

The flux density of the radio galaxy Virgo A has been measured at 38 and 151.5 MHz. These measurements and published flux densities at 59 other frequencies from 5.6 MHz to 857 GHz are used to obtain a fit to the frequency dependence of the logarithm of the flux density in the form of a second-order polynomial of the logarithm of the frequency,

\(S_\nu ^{Vir A} [Jy] = 1224.4(\nu [MHz]/150)^{ - 0.817 + 0.007\log (\nu [MHz]/150)} .\)
This spectrum, which has a small positive curvature, agrees slightly better with the observed flux densities than a purely power-lawspectrumwith the spectral index 0.793±0.003 and S150 [MHz]Vir A = 1187±23 Jy. The relative errors in using the power-law spectrum instead of this spectrum with its small, positive curvature lie in the range (−5.2−1.6)% for frequencies from 70 MHz to 857 GHz. The expected peak frequency of the spectrum of Virgo A is estimated.

Sobre autores

E. Vinyaikin

Radio Physical Research Institute

Autor responsável pela correspondência
Email: evin@nirfi.sci-nnov.ru
Rússia, ul. Bolshaya Pecherskaya 25/12a, Nizhny Novgorod, 603950

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