Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...216..294i&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 216, no. 1-2, June 1989, p. 294-304.
Astronomy and Astrophysics
Astronomy
40
Accretion Disks, Electron Acceleration, Photon-Electron Interaction, Radiation Pressure, Radio Jets (Astronomy), Active Galactic Nuclei, Black Body Radiation, Doppler Effect, Lambert Surface, Light Speed, Radio Galaxies
Scientific paper
The acceleration of gaseous bullets by radiation pressure is studied under the assumption that the radiating surface has a blackbody spectrum and is either flat, a hollow disk, or a narrow cone. The combined effect of acceleration by photons that are emitted near the cloud and deceleration by aberrated blueshifted photons that are emitted far away is shown to produce a finite terminal speed, betam, that is less than the speed of light. It is found that betam is less than about 0.8 when the temperature of the driving surface decreases upward and outward, and that it is less than about 0.4 in conical funnels with an opening half-angle of 40 deg or less. For the case of the higher final speeds assumed to exist in superluminal radio sources, conditions under which the required betam value of about 0.99 can be obtained are explored.
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