Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...212..278e&link_type=abstract
Astrophysical Journal, Part 1, vol. 212, Feb. 15, 1977, p. 278-289. Research supported by the National Research Council of Cana
Astronomy and Astrophysics
Astrophysics
2
Cosmic Rays, Galactic Nuclei, Gas Dynamics, Interstellar Gas, X Ray Sources, Active Galactic Nuclei, Astronomical Models, Balmer Series, Energy Sources, Galactic Evolution, Gas Density, Ionized Gases
Scientific paper
The effect of subrelativistic cosmic rays as the source of energy and ionization for the gas in active galactic nuclei is investigated by means of fluid-dynamic calculations. The thermal state of the gas is determined by the balance of heating from the cosmic rays and radiative cooling. Nuclear models were calculated with cosmic-ray luminosities of 10 to the exponent 43.6 to 10 to the exponent 47.6 erg/sec and gas number densities of 10 to the exponent 4.9 to 10 to the exponent 7.8 per cu cm. These result in the formation of a dense shell which reaches outward velocities of 1,000-10,000 km/sec and maintains temperatures within 10,000-100,000 K. This dense phase may produce the broad Balmer wings observed in some objects. A hot cavity forms between the shell and the source and reaches 100,000,000 K. This gas will be seen as an X-ray source. Rayleigh-Taylor instabilities in the shell can provide a source for the observed cloud structure. The high mass loss rate may be replenished by stellar loss processes if a dense star cluster exists in the nucleus.
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