The `q problem' in Seyfert NLRs

Details The `q problem' in Seyfert NLRs The `q problem' in Seyfert NLRs

May 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...190.3901m&link_type=abstract

American Astronomical Society, 190th AAS Meeting, #39.01; Bulletin of the American Astronomical Society, Vol. 29, p.828

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We present the results of a critical test for the central source photoionization model, applied to four nearby Seyferts (NGC 4151, NGC 2110, Mrk 3 and NGC 2992) with resolved Narrow Line Regions (NLRs) and extended radio structures. Inferring the ionizing photon flux, q, from the common definition of the ionization parameter (U=q/ncr(2) ), gives the surprising result that q is not the constant value expected for a central source model. The implications for the models of the ionization mechanisms in Seyfert NLRs (ionization-bounded photoionization; matter-bounded/ionization-bounded cloud mix models; and shock ionization) are discussed, as are the questions this result raises about the assumptions involved in the use of [OIII](5007)/[OII](3727) to determine U, and [SII](6717/6731) to estimate the density.

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