ALMA Observations of the Sub-kpc Structure of the Host Galaxy of a z = 6.5 Lensed Quasar: A Rotationally Supported Hyper-Starburst System at the Epoch of Reionization
ALMA Observations of the Sub-kpc Structure of the Host Galaxy of a z = 6.5 Lensed Quasar: A Rotationally Supported Hyper-Starburst System at the Epoch of Reionization
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DOI：
10.3847/1538-4357/ac0af4
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发表时间：
2021-06
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通讯作者：
M. Yue;Jinyi Yang;Xiaohui Fan;Feige Wang;J. Spilker;I. Georgiev;C. Keeton;K. Litke;D. Marrone;F. Walter;Ran Wang;Xue-bing Wu;B. Venemans;A. Zabludoff
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作者：
M. Yue;Jinyi Yang;Xiaohui Fan;Feige Wang;J. Spilker;I. Georgiev;C. Keeton;K. Litke;D. Marrone;F. Walter;Ran Wang;Xue-bing Wu;B. Venemans;A. Zabludoff
我们报告阿塔卡马大型毫米/亚毫米阵列（阿尔马）观测的尘埃连续体和[C ii]发射的宿主星系J 0439 +1634，引力透镜类星体在z = 6.5。引力透镜效应使源面分辨率提高到100.″15（100. 8 kpc）。从阿尔马数据导出的透镜模型与Fan等人基于HST成像的基准模型一致。J 0439 +1634的宿主星系可以很好地拟合一个与指数盘一致的Sérsic轮廓，无论是在远红外（FIR）连续谱还是[C ii]发射。连续谱的总放大率为4.53 ± 0.05，[C ii]线的总放大率为3.44 ± 0.05。J 0439 +1634的宿主星系是一个紧凑的超亮红外星系，总的星星形成速率（SFR）在校正透镜效应后为1.56 × 103 M yr−1，有效半径为0.74 kpc。J 0439 +1634中的解析区域遵循“[C ii]缺陷”，其中[C ii]与FIR的比率随着FIR表面亮度而降低。重建的J 0439 +1634的速度场呈类旋转。在半径为2 kpc时，最大视线旋转速度为130 km s−1。然而，我们的数据不能用轴对称薄旋转盘拟合，并且旋转轴的倾角i仍然不受约束。我们估计主星系的动力学质量为7.9sin−2（i）× 109 M <$。J 0439 +1634可能有一个高的气体质量分数和超大SMBH相比，当地的关系。J 0439 +1634的SFR达到了可能的最大值，SFR面密度接近目前已知宇宙中任何恒星形成星系的最高值。
We report Atacama Large Millimeter/Submillimeter Array (ALMA) observations of the dust continuum and [C ii] emission of the host galaxy of J0439+1634, a gravitationally lensed quasar at z = 6.5. Gravitational lensing boosts the source-plane resolution to ∼0.″15 (∼0.8 kpc). The lensing model derived from the ALMA data is consistent with the fiducial model in Fan et al. based on HST imaging. The host galaxy of J0439+1634 can be well-fitted by a Sérsic profile consistent with an exponential disk, both in the far-infrared (FIR) continuum and the [C ii] emission. The overall magnification is 4.53 ± 0.05 for the continuum and 3.44 ± 0.05 for the [C ii] line. The host galaxy of J0439+1634 is a compact ultraluminous infrared galaxy, with a total star formation rate (SFR) of 1.56 × 103 M ⊙ yr−1 after correcting for lensing and an effective radius of 0.74 kpc. The resolved regions in J0439+1634 follow the “[C ii] deficit,” where the [C ii]-to-FIR ratio decreases with FIR surface brightness. The reconstructed velocity field of J0439+1634 appears to be rotation-like. The maximum line-of-sight rotation velocity is 130 km s−1 at a radius of 2 kpc. However, our data cannot be fit by an axisymmetric thin rotating disk, and the inclination of the rotation axis, i, remains unconstrained. We estimate the dynamical mass of the host galaxy to be 7.9sin−2(i)×109M⊙ . J0439+1634 is likely to have a high gas-mass fraction and an oversized SMBH compared to local relations. The SFR of J0439+1634 reaches the maximum possible values, and the SFR surface density is close to the highest value seen in any star-forming galaxy currently known in the universe.