The AGN Ionization Cones of NGC 5728. II. Kinematics
The AGN Ionization Cones of NGC 5728. II. Kinematics
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DOI：
10.3847/1538-4357/aaf000
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发表时间：
2018-11
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影响因子：
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通讯作者：
M. Durr'e;J. Mould
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作者：
M. Durr'e;J. Mould
我们探讨了II型塞弗特星系NGC 5728电离锥的气体形态和激发机制。VLT上的SINFONI和MUSE积分场单元的近红外和光学数据所导出的动能图显示，活动星系核（AGN）驱动的外流是由一个质量为3.4 × 107 M <$m的超大质量黑洞（SMBH）驱动的，辐射光度为1.46 × 1044 erg s−1，爱丁顿比为3.3 × 10−2，吸积速率为2.7 × 10−2 M <$yr−1。对称的双锥外流在距活动星系核约250秒差距时加速到±250 km s−1，在距活动星系核约500秒差距时减速到约130 km s−1，估计质量外流速率为38 M yr−1;外流与吸积的质量比为1415。其动能为1.5 × 1042 erg s−1，为测热光度的1%。在活动星系核的活跃寿命107年中，有1.6 × 108兆焦耳的气体可以从星系中脱离出来，这是核区形成星星的大部分气体质量。根据[Fe ii]线的轮廓确定了双锥的内张角（50.°2）和与视线的倾角（47.°6）;流出轴几乎平行于星系平面。这种几何学支持活动星系核的统一模型，因为这些角度排除了被尘埃环所遮蔽的吸积盘。
We explore the gas morphology and excitation mechanisms of the ionization cones of the type II Seyfert galaxy NGC 5728. Kinematics derived from near-infrared and optical data from the SINFONI and MUSE Integral Field Units on the VLT reveal active galactic nucleus (AGN)-driven outflows powered by a supermassive black hole (SMBH) of mass 3.4 × 107 M⊙, bolometric luminosity of 1.46 × 1044 erg s−1, Eddington ratio of 3.3 × 10−2, and an accretion rate of 2.7 × 10−2 M⊙ yr−1. The symmetric bicone outflows show rapid acceleration to ±250 km s−1 at ∼250 pc, decelerating to ∼130 km s−1 at 500 pc from the AGN, with an estimated mass outflow rate of 38 M⊙ yr−1; the mass ratio of outflows to accretion is 1415. The kinetic power is ∼1.5 × 1042 erg s−1, 1% of the bolometric luminosity. Over the AGN active lifetime of ∼107 yr, 1.6 × 108 M⊙ of gas can become gravitationally unbound from the galaxy, a large proportion of the gas mass available for star formation in the nuclear region. The bicone internal opening angle (50.°2) and the inclination to the line of sight (47.°6) were determined from [Fe ii] line profiles; the outflow axis is nearly parallel to the plane of the galaxy. This geometry supports the unified model of AGNs, as these angles preclude seeing the accretion disk, which is obscured by the dusty torus.