Other
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.9801m&link_type=abstract
American Astronomical Society, 181st AAS Meeting, #98.01; Bulletin of the American Astronomical Society, Vol. 24, p.1274
Other
Scientific paper
We present a grid of models used for inferring NLR dynamics. Based on observed line intensity ratios and line shapes, we argue for a roughly constant ionization parameter throughout the NLR. To the extent that the blue wings of the profiles are insensitive to obscuration, we believe that an understanding of NLR kinematics can be achieved without detailed knowledge of how the asymmetry is produced. By assuming constant ionization parameter and omitting obscuration, we are able to obtain a very simple analytical expression for line profiles. We also compare the resulting profiles with those from a more detailed treatment which includes obscuration and varying ionization parameter. There are two important conclusions. First, we show explicitly how differing velocity fields can yield identical profiles with a suitable choice of emissivity law (and vice-versa). Second, our model profiles can be reconciled with observed profiles only if the velocity field (assumed to be radial) increases outwards, or if we consider an emissivity law other than one corresponding to spherical clouds of constant mass and number.
Cohen Ross D.
Moore Daniel
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