OI line emission in the quasar PG 1116+215

作者：Matsuoka Y^*; Oyabu S; Tsuzuki Y; Kawara K; Yoshii Y

来源：Publications of the Astronomical Society of Japan, 2005, 57(4): 563-568.

• galaxies : active
• galaxies : individual (PG 1116+215)
• galaxies : quasars : emission lines
• line : formation

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 I lines (lambda 1304, lambda 8446, and lambda 11287) in a quasar for the first time. The photon flux ratios of the O I lines of the quasar were compared with those previously measured in a Seyfert I and six narrow-line Seyfert Is. No significant differences were found in the O I line flux ratios between the quasar and the other Seyferts, suggesting that the gas density in the O I and Fe II line-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 I and Fe II emission occurring in the partly ionized regions at the outermost portion of the broad-line region where velocities are small.

• 出版日期2005