IRAS F10214 +4724 - II中优先放大的活性核。空间分辨冷分子气体
The preferentially magnified active nucleus in IRAS F10214+4724 - II. Spatially resolved cold molecular gas
摘要：
我们呈现了IRAS F10214+4724中冷（CO（1-0））分子气体的JVLA观测，IRAS F10214+4724是z=2.3的透镜ULIRG，具有模糊的活动核。该星系在CO（1-0）发射线上具有良好的空间和光谱分辨率。在3-sigma水平检测到CO（1-0）反像。将42 km/s通道中的五个（具有>5-sigma检测）映射回源平面，并且对它们的总放大率后验PDF进行采样。这揭示了一个大致线性的排列，暂时是一个旋转的圆盘。假设ULIRG L_{CO} -到- M_{gas}的转换比α= 0.8 M_sun /（K km/s pc ^2），我们推导出M_gas的分子气体质量= 1.2 +- 0.2 x 10^10 M_sun，这与在假设倾角i = 90 - 30度时，对单独的动力学质量估计所推导出的α= 0.3 - 1.3的范围吻合得很好。基于活动星系核和CO（1-0）的峰值发射位置和透镜模型，我们预测了CO谱线能量分布（SLED）的畸变，其中高阶J谱线可能部分被活动星系核加热激发，由于它们的立体角更小，更靠近活动星系核，因此焦散线的尖点将优先被透镜化。与其它透镜反演结果的比较表明，IRAS F10214+4724中的窄线区和活动星系核射电核相对于分子气体发射分别优先透镜化约3倍和11倍。这扭曲了全球连续发射光谱能量分布（SED），并建议谨慎使用IRAS F10214+4724作为原型高红移ULIRG。我们探索了两个大速度梯度（LVG）模型，结合了空间CO（1-0）和（3-2）信息，并提出了扩展的低激发冷气体成分的初步证据，这意味着IRAS F10214+4724中的总分子气体质量比使用空间分辨CO观测计算的大2倍。
英文摘要：
We present JVLA observations of the cold (CO (1-0)) molecular gas in IRAS F10214+4724, a lensed ULIRG at z=2.3 with an obscured active nucleus. The galaxy is spatially and spectrally well-resolved in the CO (1-0) emission line. A CO (1-0) counter-image is detected at the 3-sigma level. Five of the 42 km/s channels (with >5-sigma detections) are mapped back into the source plane and their total magnification posterior PDFs sampled. This reveals a roughly linear arrangement, tentatively a rotating disk. We derive a molecular gas mass of M_gas = 1.2 +- 0.2 x 10^10 M_sun, assuming a ULIRG L_{CO}-to-M_{gas} conversion ratio of α= 0.8 M_sun / (K km/s pc^2) that agrees well with the derived range of α= 0.3 - 1.3 for separate dynamical mass estimates at assumed inclinations of i = 90 - 30 degrees. Based on the AGN and CO (1-0) peak emission positions and the lens model, we predict a distortion of the CO Spectral Line Energy Distribution (SLED) where higher order J lines that may be partially excited by AGN heating will be preferentially lensed owing to their smaller solid angles and closer proximity to the AGN and therefore the cusp of the caustic. Comparison with other lensing inversion results shows that the narrow line region and AGN radio core in IRAS F10214+4724 are preferentially lensed by a factor >~ 3 and 11 respectively, relative to the molecular gas emission. This distorts the global continuum emission Spectral Energy Distribution (SED) and suggests caution in unsophisticated uses of IRAS F10214+4724 as an archetype high-redshift ULIRG. We explore two Large Velocity Gradient (LVG) models, incorporating spatial CO (1-0) and (3-2) information and present tentative evidence for an extended, low excitation cold gas component that implies that the total molecular gas mass in IRAS F10214+4724 is a factor >~2 greater than that calculated using spatially unresolved CO observations.
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