Implications of CA II emission for physical conditions in the broad-line region of active galactic nuclei

Details Implications of CA II emission for physical conditions in the broad-line region of active galactic nuclei Implications of CA II emission for physical conditions in the broad-line region of active galactic nuclei

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...347..656f&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 347, Dec. 15, 1989, p. 656-673.

Astronomy and Astrophysics

Astrophysics

127

Active Galactic Nuclei, Calcium, Emission Spectra, Photoionization, Spectral Line Width, Continuous Spectra, Fine Structure, Forbidden Transitions, H Lines, K Lines, Molecular Clouds, Seyfert Galaxies

Scientific paper

This paper summarizes observations of Ca II emission from AGN and discusses their implications for conditions in the emitting gas. Observations of Ca II K and H, the infrared triplet, and the forbidden lines near 7300 A are compiled to give a 'standard' set of line ratios for AGN with relatively strong Fe II emission. A series of photoionization calculations is presented which examines the conditions needed to produce the observed emission. Special attention is paid to the inclusion of heating due to free-free and H(-) absorption processes which couple the near-infrared to millimeter continuum with the emitting gas. It is found that, regardless of density or ionization parameters, thin clouds cannot produce the observed Ca II emission. The semiforbidden C III 1909 A/C IV 1549 A intensity ratio is not a good indicator of the ionization parameter for this continuum. Clouds with large column densities and ionization parameters largely reproduce the observed carbon, calcium, and hydrogen spectrum.

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