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| Paper: |
The State and Evolution of the Partly-Ionized Gas in AGNs Probed with Broad O I and Ca II Emission Lines |
| Volume: |
399, Panoramic Views of Galaxy Formation and Evolution |
| Page: |
421 |
| Authors: |
Matsuoka, Y.; Oyabu, S.; Kawara, K. |
| Abstract: |
We are carrying out a program to explore prominent Fe II emissionline 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 ≤ z ≤ 1.08. The comparison with photoionization model calculations suggests that gas with a density nH = 1011.5 – 1012.0 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. |
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