论文标题

ALMA 0.02“ - 分辨率观察结果揭示了NGC 1068核的HCN充值反向旋转和流出的致密分子气

ALMA 0.02"-resolution observations reveal HCN-abundance-enhanced counter-rotating and outflowing dense molecular gas at the NGC 1068 nucleus

论文作者

Imanishi, Masatoshi, Nguyen, Dieu D., Wada, Keiichi, Hagiwara, Yoshiaki, Iguchi, Satoru, Izumi, Takuma, Kawakatu, Nozomu, Nakanishi, Kouichiro, Onishi, Kyoko

论文摘要

我们提出了附近(〜14 MPC)型(〜14 MPC)Agn NGC 1068的ALMA 〜0.02“ - 分辨率观察,当时HCN/HCN/HCO+/HNC J = 3-2行,以及在13c的同位素学和振动线上的13C同位素和振动线,以仔细化围绕形式/动态/化学物质的粉尘,以置于形式/化学/化学物理性能中,以弥漫性的尘埃量为细菌的生理性量,并构成了细菌的生理性,并构成了细分的生理性,并将其化学分子刺激为细菌的生理型,并将其刺激性分子构成了细分的分子型分子的量。质量质量的黑洞。在〜7 pc的圆环区域内的HCO+ J = 3-2,我们的密集分子质量为(0.4-1.0)x10^6msun,我们认为HCN的丰度在圆环中增强了。分子线旋转速度相对于全身速度,在外部和西部圆环中,在外部(> 2 pc)中,我们更喜欢反向旋转的密集分子气体的场景,并具有几乎是keplerian的差异,并且较低的旋转(远低于keplerian)的属性构成了我们的propert torrelent。 1068比经典AGN统一范式中简单的公理对称旋转圆环图片要复杂得多。

We present ALMA ~0.02"-resolution observations of the nucleus of the nearby (~14 Mpc) type-2 AGN NGC 1068 at HCN/HCO+/HNC J=3-2 lines, as well as at their 13C isotopologue and vibrationally excited lines, to scrutinize the morphological/dynamical/chemical/physical properties of dense molecular gas in the putative dusty molecular torus around a mass-accreting supermassive black hole. We confirm almost east-west-oriented dense molecular gas emission both morphologically and dynamically, which we regard as coming from the torus. Bright emission is compact (<3 pc), and low-surface-brightness emission extends out to 5-7 pc. These dense molecular gas properties are not symmetric between the eastern and western torus. The HCN J=3-2 emission is stronger than the HCO+ J=3-2 emission within the ~7 pc torus region, with an estimated dense molecular mass of (0.4-1.0)x10^6Msun. We interpret that HCN abundance is enhanced in the torus. We detect signatures of outflowing dense molecular gas and a vibrationally excited HCN J=3-2 line. Finally, we find that in the innermost (<1 pc) part of the torus, the dense molecular line rotation velocity, relative to the systemic velocity, is the opposite of that in the outer (>2 pc) part, in both the eastern and western torus. We prefer a scenario of counter-rotating dense molecular gas with innermost almost-Keplerian-rotation and outer slowly rotating (far below Keplerian) components. Our high-spatial-resolution dense molecular line data reveal that torus properties of NGC 1068 are much more complicated than the simple axi-symmetrically rotating torus picture in the classical AGN unification paradigm.

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