TRAO Survey of Nearby Filamentary Molecular Clouds, the Universal Nursery of Stars (TRAO-FUNS). III. Filaments and Dense Cores in the NGC 2068 and NGC 2071 Regions of Orion B

IF 4.8 2区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS Astrophysical Journal Pub Date : 2023-11-01 DOI:10.3847/1538-4357/acf8c2
Hyunju Yoo, Chang Won Lee, Eun Jung Chung, Shinyoung Kim, Mario Tafalla, Paola Caselli, Philip C. Myers, Kyoung Hee Kim, Tie Liu, Woojin Kwon, Archana Soam, Jongsoo Kim
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Abstract

Abstract We present the results of molecular line observations performed toward the NGC 2068 and NGC 2071 regions of the Orion B cloud as the TRAO-FUNS project to study the roles of the filamentary structure in the formation of dense cores and stars in the clouds. Gaussian decomposition for the C 18 O spectra with multiple velocity components and the application of a friends-of-friends algorithm for the decomposed components allowed us to identify a few tens of velocity-coherent filaments. We also identified 48 dense cores from the observations of N 2 H + using a core finding tool, FellWalker. We performed a virial analysis for these filaments and dense cores, finding that the filaments with N 2 H + dense core are thermally supercritical, and the filaments with a larger ratio between the line mass and the thermal critical line mass tend to have more dense cores. We investigated the contribution of the nonthermal motions in dense cores and filaments, showing the dense cores are mostly in transonic/subsonic motions while their natal filaments are mostly in supersonic motions. This may indicate that gas turbulent motions in the filaments have been dissipated at the core scale to form the dense cores there. The filaments with (dynamically evolved) dense cores in infalling motions or with NH 2 D bright (or chemically evolved) dense cores are all found to be gravitationally critical. Therefore, the criticality of the filament is thought to provide a key condition for its fragmentation, the formation of dense cores, and their kinematical and chemical evolution.
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附近丝状分子云的TRAO巡天,恒星的普遍托儿所(TRAO- funs)。3猎户座B NGC 2068和NGC 2071区域的细丝和致密核
摘要:本文介绍了在TRAO-FUNS项目中对猎户座B星云NGC 2068和NGC 2071区域进行的分子线观测结果,以研究云中丝状结构在致密核心和恒星形成中的作用。对具有多个速度分量的c18o光谱进行高斯分解,并对分解后的分量应用friend -of-friend算法,使我们能够识别出几十个速度相干细丝。我们还使用核查找工具FellWalker从n2h +的观测中确定了48个致密核。我们对这些细丝和致密芯进行了病毒分析,发现具有n2h +致密芯的细丝是热超临界的,并且线质量与热临界线质量之比越大的细丝往往具有更致密的芯。我们研究了致密核和细丝的非热运动的贡献,发现致密核主要是跨音速/亚音速运动,而它们的出生细丝主要是超音速运动。这可能表明,细丝中的气体湍流运动在核尺度上已经消散,形成了致密的核。在落入运动中具有(动态演化)致密核的细丝或具有nh2 D明亮(或化学演化)致密核的细丝都被发现是引力临界的。因此,细丝的临界性被认为是其碎裂、致密核的形成及其运动学和化学演化的关键条件。
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来源期刊
Astrophysical Journal
Astrophysical Journal 地学天文-天文与天体物理
CiteScore
8.40
自引率
30.60%
发文量
2854
审稿时长
1 months
期刊介绍: The Astrophysical Journal is the foremost research journal in the world devoted to recent developments, discoveries, and theories in astronomy and astrophysics.
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