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题名: PROPERTIES OF INTERSTELLAR MEDIUM IN INFRARED-BRIGHT QSOs PROBED BY [O I] 63 mu m AND [C II] 158 mu m EMISSION LINES
作者: Zhao, Yinghe; Yan, Lin; Tsai, Chao-Wei
刊名: ASTROPHYSICAL JOURNAL
出版日期: 2016
卷号: 824, 期号:2, 页码:146
DOI: 10.3847/0004-637X/824/2/146
英文摘要: We present a study of the interstellar medium (ISM) in the host galaxies of nine QSOs at 0.1 < z < 0.2 with black hole masses of 3 x 10(7) M-circle dot to 3 x 10(9) M-circle dot based on the far-IR spectroscopy taken with Herschel Space Observatory. We detect the [O I] 63 mu m ([C II] 158 mu m) emission in 6 (8) out of 8 (9) sources. Our QSO sample has far-infrared luminosities (L-FIR) similar to several times 10(11) L-circle dot. The observed line-to-L-FIR ratios (L-[OI]63 mu m/L-FIR and L-[C (II])/L-FIR) are in the ranges of 2.6 x 10(-4) to 10(-2) and 2.8 x 10(-4) to 2 x 10(-3), respectively (including upper limits). These ratios are comparable to the values found in local ULIRGs, but higher than the average value published so far for z > 1 IR-bright QSOs. One target, W0752+19, shows an additional broad velocity component (similar to 720 km s(-1)) and exceptionally strong [O I] 63 mu m emission with L-[O I]63 mu m/L-FIR of 10(-2), an order of magnitude higher than the average value found among local (U)LIRGs. Combining with the analyses of the Sloan Digital Sky Survey optical spectra, we conclude that the [O I] 63 mu m emission in these QSOs is unlikely excited by shocks. We infer that the broad [O I] 63 mu m emission in W0752+19 could arise from the warm and dense ISM in the narrow-line region of the central active galactic nucleus. Another possible explanation is the existence of a dense gas outflow with n(H) similar to 10(4) cm(-3),where the corresponding broad [C II] emission is suppressed. Based on the far-IR [O I] and [C II] line ratios, we estimate constraints on the ISM density and UV radiation field intensity of n(H) less than or similar to 10(3.3) cm(-3) and 10(3) < G(0)less than or similar to 10(4.2), respectively. These values are consistent with those found in local Seyfert 1 ULIRGs. In contrast, the gas with broad velocity width in W0752+19 has n(H) greater than or similar to 10(4.3) cm(-3) and G(0) > 10(4).
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内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/16888
Appears in Collections:星系中的恒星形成研究团组_期刊论文

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