Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980pazh....6..195s&link_type=abstract
(Pis'ma v Astronomicheskii Zhurnal, vol. 6, Apr. 1980, p. 195-198.) Soviet Astronomy Letters, vol. 6, Mar.-Apr. 1980, p. 107-109
Astronomy and Astrophysics
Astronomy
Elliptical Galaxies, Emission Spectra, Galactic Radiation, Virgo Galactic Cluster, Milky Way Galaxy, Planetary Nebulae, Plasma Jets
Scientific paper
The extended emission regions observed in the galaxy M87, including the 'counterjet', might represent the combined radiation of a great many planetary nebulae. Once a planetary nebula has expanded to a critical radius of approximately 0.1 pc, its internal pressure will be balanced by the external pressure of the hot ambient plasma and it will stop expanding, instead maintaining a stable luminosity for a prolonged period. The form of the emission-line streamers aligned parallel to the axis of the jet is attributed to the disturbances (condensation and cooling) of the hot intergalactic gas that will occur when it is traversed by plasmons expelled from the nucleus of the galaxy. The intergalactic medium may continue to be perturbed in this fashion for tens of millions of years or longer. The denser hot plasma will serve to stabilize expanding planetary nebulae at a smaller radius and substantially higher luminosity than in the Galaxy.
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