EDP Sciences
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Volume 375, Number 3, September 2001
Page(s) 827 - 839
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20010906

A&A 375, 827-839 (2001)
DOI: 10.1051/0004-6361:20010906

The formation of broad emission line regions in supernova-QSO wind interactions

J. M. Pittard1, J. E. Dyson1, S. A. E. G. Falle2 and T. W. Hartquist1

1  Department of Physics & Astronomy, The University of Leeds, Woodhouse Lane, Leeds LS2 9JT, UK
2  Department of Applied Mathematics, The University of Leeds, Woodhouse Lane, Leeds LS2 9JT, UK

(Received 23 March 2001 / Accepted 22 June 2001)

We show that a cooled region of shocked supernova ejecta forms in a type II supernova-QSO wind interaction, and has a density, an ionization parameter, and a column density compatible with those inferred for the high ionization component of the broad emission line regions in QSOs. The calculations are based on the assumption that the ejecta flow is described initially by a similarity solution investigated by Chevalier (1982) and Nadyozhin (1985) and is spherically symmetric. Heating and cooling appropriate for gas irradiated by a nearby powerful continuum source is included in our model, together with reasonable assumptions for the properties of the QSO wind. The model results are also in agreement with observational correlations and imply reasonable supernova rates.

Key words: hydrodynamics -- shock waves -- stars: mass-loss -- ISM: bubbles -- galaxies: active

Offprint request: J. M. Pittard, jmp@ast.leeds.ac.uk

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