SDP的ALMA成像81- II。CO发射线的像素化重建
ALMA imaging of SDP.81 - II. A pixelated reconstruction of the CO emission lines
摘要：
我们提出了一个子100 pc规模的CO分子气体排放和引力透镜系统SDP的运动学分析。81在红移3.042使用阿塔卡马大型毫米/亚毫米阵列（ALMA）的科学验证数据和可分辨平面透镜重建技术。我们发现了明确的证据，激发依赖于结构的非透镜分子气体分布，与CO（5-4）的发射显着更扩散和结构比CO（8-7）。内禀线光度比为r_8-7/5-4 = 0.30 +/- 0.04，这与z ~ 3处的其他低激发星暴一致。对速度场的分析表明，有证据表明恒星形成盘具有多个速度分量，这与合并/合并后合并的情况一致，动力学质量M（< 1.56 kpc）= 1.6 +/- 0.6 x 10^10 M_sol。ALMA和哈勃太空望远镜的源重建显示，恒星成分与分子气体和尘埃成分相抵消。与卡尔G。Jansky甚大天阵CO（1-0）的数据，他们提供了一个复杂的~2 kpc规模的星暴，嵌入在一个更大的~15 kpc结构的确证证据。
英文摘要：
We present a sub-100 pc-scale analysis of the CO molecular gas emission and kinematics of the gravitational lens system SDP.81 at redshift 3.042 using Atacama Large Millimetre/submillimetre Array (ALMA) science verification data and a visibility-plane lens reconstruction technique. We find clear evidence for an excitation dependent structure in the unlensed molecular gas distribution, with emission in CO (5-4) being significantly more diffuse and structured than in CO (8-7). The intrinsic line luminosity ratio is r_8-7/5-4 = 0.30 +/- 0.04, which is consistent with other low-excitation starbursts at z ~ 3. An analysis of the velocity fields shows evidence for a star-forming disk with multiple velocity components that is consistent with a merger/post-coalescence merger scenario, and a dynamical mass of M(< 1.56 kpc) = 1.6 +/- 0.6 x 10^10 M_sol . Source reconstructions from ALMA and the Hubble Space Telescope show that the stellar component is offset from the molecular gas and dust components. Together with Karl G. Jansky Very Large Array CO (1-0) data, they provide corroborative evidence for a complex ~2 kpc-scale starburst that is embedded within a larger ~15 kpc structure.
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