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arXiv 1707.03078astro-ph.GA
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ALMA高分辨率观测揭示的发光$z$ = 6.13类星体ULAS J1319 $+$ 0950的气体动力学

Gas dynamics of a luminous $z$ = 6.13 quasar ULAS J1319$+$0950 revealed by ALMA high resolution observations

Yali Shao, Ran Wang, Gareth C. Jones, Chris L. Carilli, Fabian Walter, Xiaohui Fan, Dominik A. Riechers, Frank Bertoldi, Jeff Wagg, Michael A. Strauss, Alain Om… 展开作者

Yali Shao, Ran Wang, Gareth C. Jones, Chris L. Carilli, Fabian Walter, Xiaohui Fan, Dominik A. Riechers, Frank Bertoldi, Jeff Wagg, Michael A. Strauss, Alain Omont, Pierre Cox, Linhua Jiang, Desika Narayanan, Karl M. Menten

摘要:

我们提出了新的阿塔卡马大型毫米/亚毫米阵列(ALMA)观测的尘埃连续体和[C II] 158 $μ$ m精细结构线发射到远红外发光类星体,ULAS J131911.29 $+$ 095051.4在$z=6.13$,并结合新的周期1数据与ALMA周期0数据。合并后的数据有一个角分辨率$\sim$ $0.3$,并解决尘埃连续和[C II]线发射几千秒差距尺度。[C II]线发射比尘埃连续谱发射更不规则,这表明尘埃和[C II]发射气体之间的分布不同。组合数据证实了我们先前在仅来自循环0数据的较低分辨率ALMA图像中检测到的[C II]速度梯度。我们应用倾斜环模型的[C II]速度图,以获得旋转曲线,并约束的圆速度为427 PDMATHAMR 55公里秒$^{-1}$在半径为3.2千秒差距与倾角为34 PDMATHAMT。我们在3.2 kpc区域内测量到的动力学质量为13.4 $_{-5.3}^{+7.8}$ $\times 10^{10}\,M_{\odot}$。这就产生了黑洞和宿主星系质量比为0.020 $_{-0.007}^{+0.013}$,这比现在的$_{-2}^{+3}$/ $M_{\rm bulge}$的比例高出大约4倍。这表明,超大质量黑洞在早期宇宙中的类星体宿主星系中形成大部分恒星质量之前,其质量就已经增长了。

英文摘要:

We present new Atacama Large Millimeter/submillimeter Array (ALMA) observations of the dust continuum and [C II] 158 $μ$m fine structure line emission towards a far-infrared-luminous quasar, ULAS J131911.29$+$095051.4 at $z=6.13$, and combine the new Cycle 1 data with ALMA Cycle 0 data. The combined data have an angular resolution $\sim$ $0.3$, and resolve both the dust continuum and the [C II] line emission on few kpc scales. The [C II] line emission is more irregular than the dust continuum emission which suggests different distributions between the dust and [C II]-emitting gas. The combined data confirm the [C II] velocity gradient that we previously detected in lower resolution ALMA image from Cycle 0 data alone. We apply a tilted ring model to the [C II] velocity map to obtain a rotation curve, and constrain the circular velocity to be 427 $\pm$ 55 km s$^{-1}$ at a radius of 3.2 kpc with an inclination angle of 34$^\circ$. We measure the dynamical mass within the 3.2 kpc region to be 13.4$_{-5.3}^{+7.8}$ $\times 10^{10}\,M_{\odot}$. This yields a black hole and host galaxy mass ratio of 0.020$_{-0.007}^{+0.013}$, which is about 4$_{-2}^{+3}$ times higher than the present-day $M_{\rm BH}$/$M_{\rm bulge}$ ratio. This suggests that the supermassive black hole grows the bulk of its mass before the formation of the most of stellar mass in this quasar host galaxy in the early universe.

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