Photoionization Models of the Broad-line Region

Details Photoionization Models of the Broad-line Region Photoionization Models of the Broad-line Region

2007-01-15

arxiv.org/abs/astro-ph/0701437v1

Astronomy and Astrophysics

Astrophysics

Conference proceedings (invited talk) to appear in "The Central Engine of Active Galactic Nuclei", ed. L. C. Ho and J.-M. Wang

Scientific paper

The strong broad emission lines in the optical and UV spectra of Active Galactic Nuclei (AGN) are important for several reasons. Not only do they give us information about the structure of the AGN, their properties are now used to estimate black hole masses and metallicities in the vicinity of quasars, and these estimates are propagated widely throughout astronomy today. Photoionization codes such as Cloudy are invaluable for understanding the physical conditions of the gas emitting AGN broad lines. In this review, we discuss briefly the development of the historical ``standard'' model. We then review evidence that the following are important: 1.) the column density, in particular the presence of gas optically thin to the hydrogen continuum, influences the line emission; 2.) the BLR emission region is comprised of gas with a range of densities and ionization parameters; 3.) the spectral energy distribution of an individual AGN influences the line ratios in an observable way.

Affiliated with

Also associated with

No associations

Rating

Photoionization Models of the Broad-line Region does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Photoionization Models of the Broad-line Region, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Photoionization Models of the Broad-line Region will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-188019