On the formation and confinement of dense clouds in QSOs and active galactic nuclei

Details On the formation and confinement of dense clouds in QSOs and active galactic nuclei On the formation and confinement of dense clouds in QSOs and active galactic nuclei

Feb 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...227..705m&link_type=abstract

Astrophysical Journal, Part 1, vol. 227, Feb. 1, 1979, p. 705-709.

Astronomy and Astrophysics

Astrophysics

7

Active Galactic Nuclei, Galactic Evolution, Plasma Clouds, Quasars, Seyfert Galaxies, Shock Wave Interaction, Astronomical Models, Gravitational Collapse, Plasma Control, Radiative Transfer, Thermal Instability

Scientific paper

A model for the formation and confinement of dense (at least about 1 billion per cu cm) clouds in QSOs and active galactic nuclei is presented wherein thermal instabilities behind radiative shocks cause the collapse of regions where the preshock density is enhanced over that of the surrounding medium. Such shocks (of total energy around 10 to the 51st ergs) are likely to occur if the frequent optical outbursts observed in many of these objects are accompanied by mass ejections of comparable energy. It is found that clouds quite similar to those thought to exist in QSOs etc. can be created in this manner at radii of the order of 10 to the 17th cm. The clouds can be subsequently accelerated to observed bulk velocities by either radiation pressure or a collision with a much stronger (total energy around 10 to the 53 ergs) shock. Alternatively, their high observed velocities could be caused by gravitational infall or rotation. The mass production required at inner radii by the outflow models can be supplied through a mechanism previously discussed by Shields (1977).

Affiliated with

Also associated with

No associations

Rating

On the formation and confinement of dense clouds in QSOs and active galactic nuclei does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with On the formation and confinement of dense clouds in QSOs and active galactic nuclei, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and On the formation and confinement of dense clouds in QSOs and active galactic nuclei will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-828884