The VLA/ALMA Nascent Disk and Multiplicity (VANDAM) Survey of Orion Protostars. I. Identifying and Characterizing the Protostellar Content of the OMC-2 FIR4 and OMC-2 FIR3 Regions-猫眼课题宝

DOI：

10.3847/1538-4357/ab498f

发表时间：

2019-10

期刊：

The Astrophysical Journal

影响因子：

通讯作者：

中科院分区：

其他

文献类型：

作者：

J. Tobin;S. Megeath;Merel van’t Hoff;A. K. Díaz-Rodríguez;N. Reynolds;M. Osorio;G. Anglada;E. Furlan;N. Karnath;S. Offner;P. Sheehan;S. Sadavoy;A. Stutz;W. J. Fischer;M. Kama;M. Persson;J. D. Francesco;L. Looney;D. Watson;Zhi-Yun Li;I. Stephens;C. Chandler;E. Cox;M. Dunham;K. Kratter;M. Kounkel;Brian Mazur;N. Murillo;Lisa Patel;L. Pérez;D. Segura-Cox;Rajeeb Sharma;Ł. Tychoniec;F. Wyrowski

我们提出了阿塔卡马大毫米/亚毫米阵列（0.87毫米）和甚大阵列（9毫米）的意见，对OMC-2 FIR 4和OMC-2 FIR 3的猎户座整体形状的灯丝，被认为是两个最近的区域的中等质量星星的形成。我们在这些区域内的连续谱源的特征为1040 Au（0.″1）尺度，相关的分子线发射的分辨率比以前在类似波长下的观测高1030倍。我们确定了六个紧凑的连续源内OMC-2 FIR 4，四个在OMC-2 FIR 3，和一个额外的源外OMC-2 FIR 4。这种连续辐射在小于100 Au尺度上跟踪内包络和/或盘辐射。HOPS-108是OMC-2 FIR 4中唯一一颗表现出复杂有机分子（例如，甲醇和其它谱线）与连续发射一致。OMC-2 FIR 3中的HOPS-370（L = 360 L）也表现出来自高激发甲醇和其他谱线的发射。这两颗原恒星的甲醇排放表明温度足够高，可以将其从冰冷的尘埃颗粒中热蒸发;总的来说，这些原恒星具有类似于热科里诺的特征。我们没有确定一个明确的流出HOPS-108在12 CO，但我们发现的证据之间的相互作用的流出/射流从HOPS-370和OMC-2的FIR 4区域。大量的观测限制表明，HOPS-108可能是一颗处于主要质量吸积阶段的中低质量原恒星，也是OMC-2 FIR 4中最明亮的原恒星。这里提供的高分辨率数据对于将嵌入的原恒星从周围的尘埃环境中分离出来并描述它们的特征至关重要。

We present Atacama Large Millimeter/submillimeter Array (0.87 mm) and Very Large Array (9 mm) observations toward OMC-2 FIR4 and OMC-2 FIR3 within the Orion integral-shaped filament, thought to be two of the nearest regions of intermediate-mass star formation. We characterize the continuum sources within these regions on ∼40 au (0.″1) scales and associated molecular line emission at a factor of ∼30 better resolution than previous observations at similar wavelengths. We identify six compact continuum sources within OMC-2 FIR4, four in OMC-2 FIR3, and one additional source just outside OMC-2 FIR4. This continuum emission is tracing the inner envelope and/or disk emission on less than 100 au scales. HOPS-108 is the only protostar in OMC-2 FIR4 that exhibits emission from high-excitation transitions of complex organic molecules (e.g., methanol and other lines) coincident with the continuum emission. HOPS-370 in OMC-2 FIR3, with L ∼ 360 L⊙, also exhibits emission from high-excitation methanol and other lines. The methanol emission toward these two protostars is indicative of temperatures high enough to thermally evaporate it from icy dust grains; overall, these protostars have characteristics similar to hot corinos. We do not identify a clear outflow from HOPS-108 in 12CO, but we find evidence of interaction between the outflow/jet from HOPS-370 and the OMC-2 FIR4 region. A multitude of observational constraints indicate that HOPS-108 is likely a low- to intermediate-mass protostar in its main mass accretion phase and is the most luminous protostar in OMC-2 FIR4. The high-resolution data presented here are essential for disentangling the embedded protostars from their surrounding dusty environments and characterizing them.

The VLA/ALMA Nascent Disk and Multiplicity (VANDAM) Survey of Orion Protostars. I. Identifying and Characterizing the Protostellar Content of the OMC-2 FIR4 and OMC-2 FIR3 Regions

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