A suggested mechanism for Fe II emission

Details A suggested mechanism for Fe II emission A suggested mechanism for Fe II emission

Nov 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...140...49f&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 140, no. 1, Nov. 1984, p. 49-51.

Astronomy and Astrophysics

Astrophysics

4

Astronomical Spectroscopy, Autoionization, Emission Spectra, Iron, Line Spectra, Galaxies, Ground State, Lyman Spectra, Quasars, Stellar Spectra

Scientific paper

Emission lines of Fe II are seen in a large number of emission line objects. It is suggested that in cases where densities and temperatures are relatively low the Fe II line emission can be induced by Lyman line emission. A Lyman line photoionizes a Fe I atom in the ground state and excites the Fe II ion to the upper level of the observed emission transition. It is argued that the most likely mechanism is autoionization, where a Lyman line photon excites a Fe I atom resonantly to an autoionizing state, which decays to an excited Fe II state. Subsequent downward cascading produces the observed Fe II emission lines.

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