The formation of the broad emission line regions in QSOs

Details The formation of the broad emission line regions in QSOs The formation of the broad emission line regions in QSOs

Jun 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982esasp.176..595d&link_type=abstract

In ESA 3rd European IUE Conf. p 595-597 (SEE N83-11889 02-88)

Computer Science

10

Emission Spectra, Quasars, Shock Waves, Spectral Line Width, Condensing, Gas Flow, Gas Temperature, Stellar Winds, Supernovae, Wind Velocity

Scientific paper

It is suggested that the shock waves in hypersonic optically thin quasar winds are bow shocks produced by obstacles in the wind, e.g., supernovae. These waves produce post shock regions where strong Compton cooling occurs, characterized by broad emission line regions. Since the gas behind a bow shock retains a substantial fraction of the inflow velocity, there is no need to invoke a cloud acceleration process. The cooled gas forms numerous small optically thick condensations as a result of thermal instability. A supernova rate of 0.1 to 10/yr can provide the large number of clouds which must exist.

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