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题名: A Turbulent Origin for the Complex Envelope Kinematics in the Young Low-mass Core Per-bolo 58
作者: Maureira, Maria Jose; Arce, Hector G.; Offner, Stella S. R.; Dunham, Michael M.; Pineda, Jaime E.; Fernandez-Lopez, Manuel; Chen, Xuepeng; Mardones, Diego
刊名: ASTROPHYSICAL JOURNAL
出版日期: 2017
卷号: 849, 期号:2, 页码:89-
英文摘要: We use CARMA 3 mm continuum and molecular lines (NH2D, N2H+, HCO+, HCN, and CS) at similar to 1000 au resolution to characterize the structure and kinematics of the envelope surrounding the deeply embedded first core candidate Per-bolo 58. The line profile of the observed species shows two distinct peaks separated by 0.4-0.6 km. s(-1), which most likely arise from two different optically thin velocity components rather than the product of self-absorption in an optically thick line. The two velocity components, each with a mass of similar to 0.5-0.6 M circle dot, overlap spatially at the position of the continuum emission and produce a general gradient along the outflow direction. We investigate whether these observations are consistent with infall in a turbulent and magnetized envelope. We compare the morphology and spectra of the N2H+ (1-0) with synthetic observations of an MHD simulation that considers the collapse of an isolated core that is initially perturbed with a turbulent field. The proposed model matches the data in the production of two velocity components, traced by the isolated hyperfine line of the N2H+ (1-0) spectra, and shows a general agreement in morphology and velocity field. We also use large maps of the region to compare the kinematics of the core with that of the surrounding large-scale filamentary structure and find that accretion from the large-scale filament could also explain the complex kinematics exhibited by this young dense core.
语种: 英语
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/17537
Appears in Collections:分子云与恒星形成研究团组_期刊论文

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