Physical conditions in faint gigahertz-peaked spectrum radio sources |
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Authors: | S A Tyul’bashev |
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Institution: | (1) Pushchino Radio Astronomy Observatory, Astro Space Center of the Lebedev Institute of Physics, Russian Academy of Sciences, Pushchino, Moscow oblast, 142290, Russia |
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Abstract: | Weak, compact radio sources (~100 mJy peak flux, L~1–10 pc) with their spectral peaks at about a gigahertz are studied, based on the complete sample of 46 radio sources of Snellen, drawn from high-sensitivity surveys, including the low-frequency Westerbork catalog. The physical parameters have been estimated for 14 sources: the magnetic field (H ⊥), the number density of relativistic particles (n e), the energy of the magnetic field $(E_{H_ \bot } )$ , and the energy of relativistic particles (E e). Ten sources have $E_{H_ \bot } \ll E_e $ , three have approximate equipartition of the energies $(E_{H_ \bot } \sim E_e )$ , and only one has $E_{H_ \bot } \gg E_e $ . The mean magnetic fields in quasars (10?3 G) and galaxies (10?2 G) have been estimated. The magnetic field appears to be related to the sizes of compact features as $H \sim 1/\sqrt L $ . |
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