Expanding quasar envelopes. I - Steady radiation-driven winds

Details Expanding quasar envelopes. I - Steady radiation-driven winds Expanding quasar envelopes. I - Steady radiation-driven winds

Nov 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975a%26a....44..123k&link_type=abstract

Astronomy and Astrophysics, vol. 44, no. 1, 1975, p. 123-138.

Astronomy and Astrophysics

Astrophysics

30

Magnetohydrodynamic Flow, Mass Flow Rate, Quasars, Radiation Pressure, Astronomical Models, Cosmic Plasma, Critical Mass, Envelopes, Gas Density, Mass Transfer, Nonthermal Radiation, Optical Density, Supercritical Flow, Thermal Radiation, Thermodynamic Equilibrium

Scientific paper

The paper investigates spherically symmetric expanding envelopes which are in ionization and thermal equilibrium in nonthermal radiation field of a QSO and which are accelerated by momentum absorption from this radiation field as well as by the thermal pressure gradient and gravity. It is found that the winds are parametrized by the luminosity-to-mass ratio and by the fractional mass loss rate. A maximum permitted value for fractional mass flow rate exists beyond which no winds with subsonic branches above the QSO surface can exist. This critical mass loss rate over a wide range of luminosity-to-mass ratio gives a lifetime of approximately 10 million years against steady mass loss. Winds with subsonic branches cannot achieve relativistic velocities, whereas winds which emerge from the radiation-producing core with supersonic velocities (supercritical fractional mass loss rates) reach asymptotic velocities of up to c/10.

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