发表机构
Shanghai Astronomical Observatory, Chinese Academy of Sciences; National Astronomical Observatory of Japan; The Graduate University for Advanced Studies, SOKENDAI; Kyushu University（中国科学院上海天文台; 日本国立天文台; 综合研究大学院大学; 九州大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
利用ALMA观测C$^{18}$O和N$_2$D$^+$发射，揭示了MMS 2中中心凝聚结构和环双星包层的致密气体性质，并发现丝状结构偏移源于温暖环境。
AI 中文摘要
我们报道了阿塔卡马大型毫米/亚毫米波阵列对猎户座分子云-3区域中毫米多系统MMS 2的1.3毫米连续谱、C$^{18}$O（$J=2$$-$$1$）和N$_{2}$D$^{+}$（$J=3$$-$$2$）的观测，角分辨率为1.59角秒（约620天文单位）。MMS 2处于平谱阶段，其原恒星处于主吸积阶段的晚期。我们探测到与1.3毫米连续谱源MMS 2-North和MMS 2-South相关的C$^{18}$O发射所示踪的中心凝聚结构，这两个源分别被空间分辨和未分辨。与MMS 2-North相关的中心凝聚结构的估计直径和质量分别为1.64角秒（约640天文单位）和3.0×10$^{-4}$太阳质量。我们还探测到一个由C$^{18}$O发射示踪的、与环双星包层相关的延展结构，尺度为5.70角秒（约2240天文单位），估计气体质量为1.4×10$^{-2}$太阳质量。此外，我们在MMS 2以南探测到一个由N$_2$D$^+$发射示踪的丝状结构，该结构与C$^{18}$O发射在空间上存在偏移。这种偏移可能归因于周围温暖环境的影响。
英文摘要
We report the Atacama Large Millimeter/submillimeter Array observations of 1.3 mm continuum, C$^{18}$O ($J=2$$-$$1$), and N$_{2}$D$^{+}$ ($J=3$$-$$2$) toward the millimeter multi-system MMS 2 in the Orion Molecular Cloud-3 region, at an angular resolution of 1.59" ($\sim$620 au). MMS 2 is in the flat-spectrum phase, with its protostars in the late stage of the main accretion phase. We detect the centrally condensed structures traced by C$^{18}$O emission associated with the 1.3 mm continuum sources MMS 2-North and MMS 2-South, which are spatially resolved and unresolved, respectively. The estimated diameter and mass of the centrally condensed structure associated with MMS 2-North are 1.64" ($\sim$640 au) and 3.0$\times$10$^{-4}$M$_{\odot}$, respectively. We also detect an extended structure traced by C$^{18}$O emission associated the circumbinary envelope at scale of 5.70" ($\sim$2240 au) with an estimated gas mass of 1.4$\times$10$^{-2}$$M_{\odot}$. In addition, we detect a filamentary structure traced by N$_2$D$^+$ emission to the south of MMS 2, which is spatially offset from the C$^{18}$O emission. This offset may be attributed to the influence of the warm surrounding environment.
Comments19 pages, 7 figures, accepted for publication in Astrophysical Journal
