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arXiv 0802.4024astro-ph
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类星体PG 1700+518的旋转风

The rotating wind of the quasar PG 1700+518

S. Young, D. J. Axon, A. Robinson, J. H. Hough, J. E. Smith

摘要:

现在人们普遍认为,大多数星系都经历了一个活跃阶段,在此期间,一个中心的超大质量黑洞通过气体的引力吸积产生巨大的辐射亮度。从围绕黑洞的旋转吸积盘发射的风被认为起着关键作用,使盘释放角动量,否则会抑制吸积。这样的风能够在宿主星系及其周围沉积大量的机械能,深刻地影响其形成和演化,并可能调节早期宇宙中大尺度宇宙结构的形成。虽然有很好的理论基础相信活动星系核的外流是由盘风产生的,但观测验证已被证明是难以捉摸的。在这里,我们表明,在类星体PG 1700+158的宽H-α发射线上观察到的偏振光结构起源于电子散射风中的吸积盘附近。风有很大的旋转运动(~ 4,000 km/s),提供直接的观测证据,表明来自活动星系核的外流是从盘发射的。此外,风几乎垂直地从盘上升,有利于发射机构,赋予垂直于盘平面的初始加速度。

英文摘要:

It is now widely accepted that most galaxies undergo an active phase, during which a central super-massive black hole generates vast radiant luminosities through the gravitational accretion of gas. Winds launched from a rotating accretion disk surrounding the black hole are thought to play a critical role, allowing the disk to shed angular momentum that would otherwise inhibit accretion. Such winds are capable of depositing large amounts of mechanical energy in the host galaxy and its environs, profoundly affecting its formation and evolution, and perhaps regulating the formation of large-scale cosmological structures in the early Universe. Although there are good theoretical grounds for believing that outflows from active galactic nuclei originate as disk winds, observational verification has proven elusive. Here we show that structures observed in polarized light across the broad H-alpha emission line in the quasar PG 1700+158 originate close to the accretion disk in an electron scattering wind. The wind has large rotational motions (~4,000 km/s), providing direct observational evidence that outflows from active galactic nuclei are launched from the disks. Moreover, the wind rises nearly vertically from the disk, favouring launch mechanisms that impart an initial acceleration perpendicular to the disk plane.

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