Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aspc..399..421m&link_type=abstract
Panoramic Views of Galaxy Formation and Evolution ASP Conference Series, Vol. 399, proceedings of the conference held 11-16 Dece
Astronomy and Astrophysics
Astronomy
Scientific paper
We are carrying out a program to explore prominent Fe II emission-line regions in AGNs with near-infrared (NIR) O I and Ca II lines as tracers. To date we have observed and compiled the relevant O I (λ1304, λ8446, and λ11287) and Ca II (λ8579 triplet) lines in 11 quasars at 0.06 le z le 1.08.
The comparison with photoionization model calculations suggests that gas with a density n_{H} = 10^{11.5} - 10^{12.0} cm^{-3} is present in an outer portion of the broad emission-line region (BELR) illuminated by the ionizing radiation whose flux corresponds to the ionization parameter U = 10^{-3.0} - 10^{-2.5} on average. While the revealed gas density is similar, the ionizing radiation flux appears to be diverse among the quasars.
Kawara Kimiaka
Matsuoka Yuuki
Oyabu Shinki
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