Central concentration of warm and dense molecular gas in a strongly lensed submillimeter galaxy at z = 6
Central concentration of warm and dense molecular gas in a strongly lensed submillimeter galaxy at z = 6
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z = 6 处强透镜亚毫米星系中温暖而致密的分子气体的中心浓度
DOI：
10.1093/pasj/psac082
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发表时间：
2022
影响因子：
2.3
通讯作者：
Lee Minju M
中科院分区：
文献类型：
--
作者：
Tsujita Akiyoshi;Tadaki Ken-ichi;Kohno Kotaro;Hatsukade Bunyo;Egusa Fumi;Tamura Yoichi;Nishimura Yuri;Zavala Jorge;Saito Toshiki;Umehata Hideki;Lee Minju M
我们报告了利用阿塔卡马大型毫米/亚毫米阵列观测，检测到朝向 G09-83808（或 H-ATLAS J090045.4+004125）的 CO(12–11) 线发射，G09-83808 是一个强透镜亚毫米星系 atz= 6.02。结合之前探测到的[Oiii] 88 μm、[Nii] 205 μm以及0.6mm和1.5mm的尘埃连续体，我们研究了G09-83808中多相星际介质的物理性质。源平面重建表明，CO(12-11) 排放区域是紧凑的 ()，并且与尘埃连续体的区域大致一致。 CO谱线能量分布的非局域热力学平衡辐射传递模型表明，大部分CO(12–11)发射来自温暖的(Tkin运动温度= 320 ± 170 K)和稠密的[log (nH2/cm−3) = 5.4 ± 0.6]气体，表明温暖和稠密的分子气体集中在中心0.5 kpc区域。 G09-83808中的光度比估计为LCO(12-11)/LCO(6-5)= 1.1 ± 0.2。高比率与局部活动星系核（AGN）和6 <z< 7 类星体的比率一致，这一事实意味着G09-83808将是再电离时代探索尘埃遮蔽的AGN的良好目标。在重建的[Oiii] 88 μm和[Nii] 205 μm立方体中，我们还发现单调速度梯度在中心星暴区域上延伸了2倍，并且存在恒星形成子成分。对明亮的 [Cii] 158 μm 线发射的高分辨率观测将使我们能够表征可能的旋转盘的运动学和子组件的性质。
We report the detection of the CO(12–11) line emission toward G09-83808 (or H-ATLAS J090045.4+004125), a strongly-lensed submillimeter galaxy atz= 6.02, with Atacama Large Millimeter/submillimeter Array observations. Combining previously detected [Oiii] 88 μm, [Nii] 205 μm, and dust continuum at 0.6 mm and 1.5 mm, we investigate the physical properties of the multi-phase interstellar medium in G09-83808. A source-plane reconstruction reveals that the region of the CO(12–11) emission is compact () and roughly coincides with that of the dust continuum. Non-local thermodynamic equilibrium radiative transfer modeling of CO spectral-line energy distribution reveals that most of the CO(12–11) emission comes from a warm (kinetic temperature ofTkin= 320 ± 170 K) and dense [log (nH2/cm−3) = 5.4 ± 0.6] gas, indicating that the warm and dense molecular gas is concentrated in the central 0.5 kpc region. The luminosity ratio in G09-83808 is estimated to beLCO(12-11)/LCO(6-5)= 1.1 ± 0.2. The high ratio is consistent with those in local active galactic nuclei (AGNs) and 6 <z< 7 quasars, the fact of which implies that G09-83808 would be a good target to explore dust-obscured AGNs in the epoch of reionization. In the reconstructed [Oiii] 88 μm and [Nii] 205 μm cubes, we also find that a monotonic velocity gradient is extending over the central starburst region by a factor of 2 and that star-forming sub-components exist. High-resolution observations of bright [Cii] 158 μm line emissions will enable us to characterize the kinematics of a possible rotating disk and the nature of the sub-components.