使用NOEMA观测到的NGC 1333 IRAS 4B和4B'中的星际复杂有机分子与分子外流

中文摘要 AI 辅助

我们展示了使用北方扩展毫米波阵列（NOEMA）对NGC 1333 IRAS 4B和4B'的干涉测量观测，这两个年轻恒星天体（YSOs）位于英仙座分子云中。YSOs，尤其是0级原恒星，富含气相星际复杂有机分子（iCOMs），但人们对这些重要的生命前分子的空间分布知之甚少。在145 GHz频谱范围内，对IRAS 4B及其周围区域的各种分子进行了成像，揭示了IRAS 4B温暖内包层内的数百个分子跃迁。这项工作为IRAS 4B提供了11种分子的物理参数（转动温度、柱密度、相对于本地静止标准的速度偏移以及谱线半高全宽），包括甲醇（CH$_3$OH及其同位素体）、甲酸甲酯（HCOOCH$_3$）、二甲醚（CH$_3$OCH$_3$）、乙醛（CH$_3$CHO）、乙醇（C$_2$H$_5$OH）、乙醇醛（CH$_2$OHCHO）、丙酮（CH$_3$COCH$_3$）和异氰酸（HNCO）。在这些分子中，有10种是iCOMs（不包括HNCO），它们示踪了IRAS 4B的内包层，并将其标记为有机物质的丰富来源。IRAS 4B的连续谱发射与iCOM分子发射之间，以及各种iCOM之间，存在强烈的空间相关性。物理参数和积分强度图显示，IRAS 4B是一个双原恒星系统，驱动着南北方向的喷流和西北-东南方向的外流。IRAS 4B'也驱动着东西方向的外流，但没有证据表明其分子发射与其连续谱发射共位。

英文摘要

We present interferometric observations with the Northern Extended Millimeter Array (NOEMA) of NGC 1333 IRAS 4B and 4B', two young stellar objects (YSOs) within the Perseus molecular cloud. YSOs, especially Class 0 protostars, are rich in gas-phase interstellar complex organic molecules (iCOMs), but relatively little is known about the spatial distribution of these important prebiotic molecules. Various molecules were imaged within IRAS 4B and the surrounding area in the 145 GHz spectral range, revealing hundreds of molecular transitions within the warm inner envelope of IRAS 4B. This work provides derived physical parameters (rotational temperature, column density, velocity shift with respect to local standard of rest, and full-width at half-maximum spectral line width) for 11 molecules toward IRAS 4B including methanol (CH$_3$OH and isotopologues), methyl formate (HCOOCH$_3$), dimethyl ether (CH$_3$OCH$_3$), acetaldehyde (CH$_3$CHO), ethanol (C$_2$H$_5$OH), glycolaldehyde (CH$_2$OHCHO), acetone (CH$_3$COCH$_3$), and isocyanic acid (HNCO). Out of these molecules, 10 are iCOMs (excluding HNCO) that trace the inner envelope of IRAS 4B and mark it as a rich source of organic material. There is a strong spatial correlation between the continuum emission of IRAS 4B and iCOM molecular emission and among various iCOMs with each other. Physical parameter and integrated intensity maps show that IRAS 4B is a binary protostar system that drives a jet in a north-south orientation and an outflow in a northwest-southeast orientation. IRAS 4B' also drives a west-east outflow but shows no evidence of molecular emission cospatial with its continuum emission.

发表机构

• University of Wisconsin-Madison（威斯康星大学麦迪逊分校）
• The University of Western Ontario（韦仕敦大学）
• California Institute of Technology（加州理工学院）

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43 pages, submitted to ApJ