Locally Optimally Emitting Clouds and the Origin of Narrow Line Region Emission

Details Locally Optimally Emitting Clouds and the Origin of Narrow Line Region Emission Locally Optimally Emitting Clouds and the Origin of Narrow Line Region Emission

May 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...188.0410f&link_type=abstract

American Astronomical Society, 188th AAS Meeting, #04.10; Bulletin of the American Astronomical Society, Vol. 28, p.825

Astronomy and Astrophysics

Astronomy

Scientific paper

An essential component to the understanding of active galaxies is narrow line region (NLR) emission. We present new calculations of NLR spectra using the locally optimally emitting cloud (LOC) model. The LOC model assumes that a family of photoionized clouds, in terms of cloud density and distance from the ionizing source, is responsible for narrow line emission. The observed NLR spectrum is a natural consequence of the ability of these `NLR clouds' to reprocess the incident continuum. We compute line diagnostic diagrams and make comparisons with various observations. The AGN temperature conundrum, the [OIII] temperature and [SII] density contradiction, is discussed. We calculate simple Keplerian line profiles of our model NLR and plot the line widths versus critical density.

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