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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
2017-11-10
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume849Issue:2Pages:14
Abstract

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.

KeywordISM: individual objects (Per-bolo 58) stars: formation stars: kinematics and dynamics stars: low-mass stars: protostars
DOI10.3847/1538-4357/aa91ce
WOS KeywordMOLECULAR CLOUD CORES ; 1ST HYDROSTATIC CORE ; STAR-FORMATION ; DENSE CORES ; DARK CLOUDS ; PROTOSTELLAR COLLAPSE ; DECAYING TURBULENCE ; EVOLUTIONARY STATE ; STELLAR DENSITIES ; MAGNETIC-FIELDS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000414587300009
PublisherIOP PUBLISHING LTD
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/22578
Collection中国科学院紫金山天文台
Corresponding AuthorMaureira, Maria Jose
Affiliation1.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
Recommended Citation
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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