A Turbulent Origin for the Complex Envelope Kinematics in the Young Low-mass Core Per-bolo 58 | |
Maureira, Maria Jose1; Arce, Hector G.1; Offner, Stella S. R.2; Dunham, Michael M.3; Pineda, Jaime E.4; Fernandez-Lopez, Manuel5; Chen, Xuepeng6; Mardones, Diego7 | |
刊名 | ASTROPHYSICAL JOURNAL |
2017-11-10 | |
卷号 | 849期号:2页码:14 |
关键词 | ISM: individual objects (Per-bolo 58) stars: formation stars: kinematics and dynamics stars: low-mass stars: protostars |
ISSN号 | 0004-637X |
DOI | 10.3847/1538-4357/aa91ce |
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. |
WOS关键词 | MOLECULAR CLOUD CORES ; 1ST HYDROSTATIC CORE ; STAR-FORMATION ; DENSE CORES ; DARK CLOUDS ; PROTOSTELLAR COLLAPSE ; DECAYING TURBULENCE ; EVOLUTIONARY STATE ; STELLAR DENSITIES ; MAGNETIC-FIELDS |
WOS研究方向 | Astronomy & Astrophysics |
语种 | 英语 |
出版者 | IOP PUBLISHING LTD |
WOS记录号 | WOS:000414587300009 |
内容类型 | 期刊论文 |
源URL | [http://libir.pmo.ac.cn/handle/332002/22577] |
专题 | 中国科学院紫金山天文台 |
通讯作者 | Maureira, Maria Jose |
作者单位 | 1.Yale Univ, Dept Astron, New Haven, CT 06511 USA 2.Univ Texas Austin, Dept Astron, Austin, TX 78712 USA 3.SUNY Coll Fredonia, Dept Phys, Fredonia, NY 14063 USA 4.Max Planck Inst Extraterr Phys, Giessenbachstr 1, D-85748 Garching, Germany 5.CICPBA, CONICET, CCT La Plata, Inst Argentino Radioastron, CC 5, Villa Elisa 1894, Argentina 6.Chinese Acad Sci, Purple Mt Observ, 2 West Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China 7.Univ Chile, Dept Astron, Casilla 36-D, Santiago, Chile |
推荐引用方式 GB/T 7714 | Maureira, Maria Jose,Arce, Hector G.,Offner, Stella S. R.,et al. A Turbulent Origin for the Complex Envelope Kinematics in the Young Low-mass Core Per-bolo 58[J]. ASTROPHYSICAL JOURNAL,2017,849(2):14. |
APA | Maureira, Maria Jose.,Arce, Hector G..,Offner, Stella S. R..,Dunham, Michael M..,Pineda, Jaime E..,...&Mardones, Diego.(2017).A Turbulent Origin for the Complex Envelope Kinematics in the Young Low-mass Core Per-bolo 58.ASTROPHYSICAL JOURNAL,849(2),14. |
MLA | Maureira, Maria Jose,et al."A Turbulent Origin for the Complex Envelope Kinematics in the Young Low-mass Core Per-bolo 58".ASTROPHYSICAL JOURNAL 849.2(2017):14. |
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