| Autor: |
Matsuoka, Yoshiki, Oyabu, Shinki, Tsuzuki, Yumihiko, Kawara, Kimiaki, Yoshii, Yuzuru |
| Zdroj: |
Publications of the Astronomical Society of Japan; August 2005, Vol. 57 Issue: 4 p563-568, 6p |
| Abstrakt: |
By observing the near-infrared spectrum of the quasar PG 1116$+$215 at $z = 0.176$and combining with the HST/FOS spectrum, we obtained the relative strengths of three permitted O ilines ($\lambda$1304, $\lambda$8446, and $\lambda$11287) in a quasar for the first time. The photon flux ratios of the O ilines of the quasar were compared with those previously measured in a Seyfert 1 and six narrow-line Seyfert 1 s. No significant differences were found in the O iline flux ratios between the quasar and the other Seyferts, suggesting that the gas density in the O iand Fe iiline-emitting regions in the quasar is of the same order as those in low-luminosity AGNs. It was also found that the line width of O i$\lambda$11287 is significantly narrower than that of Ly$\alpha$, which is consistent with O iand Fe iiemission occurring in the partly ionized regions at the outermost portion of the broad-line region where velocities are small. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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