The excitation mechanism of forbidden Fe II 1.644 micron emission in Seyfert and starburst galaxies revisited

Details The excitation mechanism of forbidden Fe II 1.644 micron emission in Seyfert and starburst galaxies revisited The excitation mechanism of forbidden Fe II 1.644 micron emission in Seyfert and starburst galaxies revisited

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...406...52m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 406, no. 1, p. 52-59.

Astronomy and Astrophysics

Astrophysics

37

Active Galactic Nuclei, Forbidden Transitions, Metallicity, Seyfert Galaxies, Starburst Galaxies, Cosmic Dust, Iron, Molecular Excitation

Scientific paper

The observational properties of forbidden Fe II are studied in galaxies with starburst nuclei (SBN) and in AGNs. The forbidden Fe II/Br-gamma value is controlled by the volume ratio of partly ionized to fully ionized regions, since forbidden Fe II emission is excited in partly ionized gas. The depletion effect is less important to the observed forbidden Fe II/Br-gamma ratio, although iron is one of the refractory elements which are easily depleted into dust grains. In SBNs, forbidden Fe II emission arises mainly from partly ionized regions associated with SNRs. Photodissociation regions situated near OB stars do not contribute significantly to the observed forbidden Fe II flux. In AGNs, X-rays from Seyfert nuclei create extended partly ionized zones ion narrow-line regions from which forbidden Fe II emission arises. This naturally explains the properties of AGNs that forbidden Fe II/Br-gamma is large and forbidden Fe II emission is broad with respect to SBNs.

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