Independent estimates of energies of steep-spectrum radio sources

Abstract

We examine properties of galaxies and quasars with steep low-frequency spectra from the UTR-2 catalogue. The number of the objects have the non-thermal X-ray emission due to the inverse Compton scattering of radio photons of the microwave background by relativistic electrons. So, it is possible to estimate the magnetic field strength and the ratio of energies of the magnetic field and relativistic particles, independently. As we have received the determined values of magnetic field strength are near to one order less than those at the well-known energy equipartition condition. We conclude from the obtained energy ratio that the energy of relativistic particles prevails over the energy of magnetic field in the galaxies and quasars with steep radio spectra.

Evolution Features of Giant Sources With Linear and Break Steep Radio Spectra

“…We have identified 130 galaxies and 91 quasars with steep low-frequency spectrum at selection criteria (lowfrequency spectral index exceeds 1, and flux density is more than 10 Jy at the frequency 25 MHz) in two fields of UTR-2 catalogue. So, the compiled sample includes 78 galaxies with linear steep spectrum (S) and 52 galaxies with break steep spectrum (C+), 55 quasars with linear steep spectrum (S) and 36 quasars with break steep spectrum (C+) (Miroshnichenko, 2014). We use for calculations of physical parameters of considered sources the CDM -Universe model with cosmological parameters m = 0.27,  = 0.73,  = 71 km/sMpc.…”