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arXiv 1505.04052astro-ph.GA
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近红外积分场光谱X:NGC5929研究AGN中的馈入与反馈

Feeding versus feedback in AGN from near-infrared Integral Field Spectroscopy X: NGC5929

Rogemar A. Riffel, Thaisa Storchi-Bergmann, Rogerio Riffel

摘要:

我们提出了近红外发射线通量分布,激发和运动学,以及恒星运动学,内520 x520 pc 2 $的塞弗特2星系NGC 5929。观测是用双子座的近红外积分场光谱仪(NIFS)进行的,空间分辨率为20 pc,光谱分辨率为40 km/s,在J和K波段。H2,[Fe II],[PII]和复合线的通量分布在大部分视场上延伸,沿PA=60/240度观察到最高强度水平,并且与无线电发射很好地相关。H2和[Fe II]线发射起源于热过程,主要是由于来自中央活动星系核(AGN)的X射线对气体的加热。射电喷流对激波的贡献是在与核东北0.5”和西南0.6”的射电热点同空间的位置观测到的,这一点可以通过发射线比和气体运动学得到证明。恒星的运动学表明,在修正了18.3度的倾角后,恒星的自转幅度为200 km/s。由K波段积分谱得到的恒星速度色散为sigma*=133+/-8 km/s,利用M-sigma * 关系,推测该超大质量黑洞的质量为M=5.2E7 Msun。气体运动学呈现出三个组成部分:(1)星系平面内的气体相对于恒星反向旋转;(2)垂直于射电喷流的外流,这似乎是由于赤道活动星系核外流造成的;(3)与射电热点相关的气体湍流,支持射电喷流与圆盘气体的相互作用。我们估算了电离气体和热分子气体的质量分别为~1.3E6 Msun和~470 Msun。

英文摘要:

We present near-infrared emission-line flux distributions, excitation and kinematics, as well as stellar kinematics, of the inner 520x520 pc2$ of the Seyfert 2 galaxy NGC5929. The observations were performed with the Gemini's Near-Infrared Integral Field Spectrograph (NIFS) at a spatial resolution of 20 pc and spectral resolution of 40km/s in the J- and K-bands. The flux distributions of H2, [FeII], [PII] and recombination lines are extended over most of the field of view, with the highest intensity levels observed along PA=60/240deg, and well correlated with the radio emission. The H2 and [FeII] line emission are originated in thermal processes, mainly due to heating of the gas by X-rays from the central Active Galactic Nucleus (AGN). Contribution of shocks due to the radio jet is observed at locations co-spatial with the radio hotspots at 0.5" northeast and 0.6" southwest of the nucleus, as evidenced by the emission-line ratio and gas kinematics. The stellar kinematics shows rotation with an amplitude at 250pc from the nucleus of 200 km/s after corrected for the inferred inclination of 18.3deg. The stellar velocity dispersion obtained from the integrated K-band spectrum is sigma*=133+/-8 km/s, which implying on a mass for the supermassive black hole of M=5.2E7 Msun, using the M-sigma* relation. The gas kinematics present three components: (1) gas in the plane of the galaxy in counter-rotation relative to the stars; (2) an outflow perpendicular to the radio jet that seems to be due to an equatorial AGN outflow; (3) turbulence of the gas observed in association with the radio hot spots, supporting an interaction of the radio jet with the gas of the disk. We estimated the mass of ionized and warm molecular gas of ~1.3E6 Msun and ~470 Msun, respectively.

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