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Calcium Infrared Triplet Emission in AGN

  • S. E. Persson (a1) and G. J. Ferland (a2)

Abstract

Emission in the Ca II infrared triplet lines has been detected in 15 AGN. Correlations with optical Fe II emission and O I λ8446 linewidths indicate that Ca II emission comes from neutral gas within the BLR. A new series of ionization models that extend to column densities N H of 1025 cm−2 match the Ca II line strengths and various line ratios. The solution to the Ca II problem, which also solves the “Fe II problem” and the “energy puzzle”, is that a small amount of H dominates the heating, even for N H ∼1022 cm−2, by absorbing the powerful near-infrared (1 μm) continuum.

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References

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Collin-Souffrin, S., 1986, Astr.Ap., 166, 115.
Davidson, K., and Netzer, H 1979, Rev. Mod. Phys., 51, 715.
Ferland, G. J., and Rees, M. J. 1988, preprint.
Mathews, W. G., and Ferland, G. J. 1987, Ap.J., 323, 456.
Netzer, H. 1985, Ap.J., 289, 451.
Persson, S. E. 1988, Ap.J., 330, 751.

Calcium Infrared Triplet Emission in AGN

  • S. E. Persson (a1) and G. J. Ferland (a2)

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