Expanding quasar envelopes. II - Radiation-driven instabilities

Details Expanding quasar envelopes. II - Radiation-driven instabilities Expanding quasar envelopes. II - Radiation-driven instabilities

Oct 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976a%26a....52..203m&link_type=abstract

Astronomy and Astrophysics, vol. 52, no. 2, Oct. 1976, p. 203-212.

Astronomy and Astrophysics

Astrophysics

36

Astrophysics, Quasars, Radiation Pressure, Astronomical Models, Density Distribution, Pressure Oscillations, Radiative Recombination, Stellar Winds

Scientific paper

It is shown that spherically symmetric radiation-driven winds are, in general, unstable; density perturbations at the quasar surface are propagated outwards as sound waves with amplitudes that exponentiate towards large asymptotic values as the waves pick up energy from the radiation field. This type of instability occurs whenever the gas is subjected to a body force which increases with density. In the quasar problem, this is always the cause if the radiation spectrum is not too steep and if the period of the oscillation is long as compared with the time of radiative recombination.

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