Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...406...47d&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 406, no. 1, p. 47-51.
Astronomy and Astrophysics
Astrophysics
2
Energy Transfer, Galactic Radiation, High Energy Electrons, Line Spectra, Luminosity, Radio Galaxies, Emission Spectra, Relativistic Particles
Scientific paper
The possibility that relativistic electrons (REs) are a primary energy source to power line emission (LE) in distant radio galaxies is considered. Energy is transferred from REs to ambient gas due to the ionization of neutral gas and Cerenkov emission of plasma waves. These interactions cool the REs and heat the dense ambient gas, which then radiates LE. Cold dense gas in contact with REs effectively transfers energy from the REs to LE. The REs heat the gas to temperatures of about 10,000 K, which then remains at this temperature radiating LE as it is continually heated by REs. When REs are the primary energy source powering the LE, the emission-line luminosity is expected to be proportional to the radio power. The observed normalization between the line luminosity and the radio power is obtained for average gas densities of about 0.005/cu cm to 0.5/cu cm, indicating gas masses within a 50-kpc radius spherical volume around the radio galaxy, which has a mass of about 5 x 10 exp 10 to 5 x 10 exp 12 solar masses.
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