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Kinematics of a Young Low-mass Star-forming Core: Understanding the Evolutionary State of the First-core Candidate L1451-mm
Maureira, Maira Jose1; Arce, Hector G.1; Dunham, Michael M.2; Pineda, Jaime E.3; Fernandez-Lopez, Manuel4; Chen, Xuepeng5; Mardones, Diego6
2017-03-20
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume838Issue:1Pages:15
Corresponding AuthorMaureira, Maira Jose(mariajose.maureira@yale.edu)
AbstractWe use 3 mm multiline and continuum CARMA observations toward the first hydrostatic core (FHSC) candidate L1451-mm to characterize the envelope kinematics at 1000 au scales and investigate its evolutionary state. We detect evidence of infall and rotation in the NH2D(11,110,1), N2H+(10), and HCN(10) molecular lines. We compare the positionvelocity diagram of the NH2D(11,110,1) line with a simple kinematic model and find that it is consistent with an envelope that is both infalling and rotating while conserving angular momentum around a central mass of about 0.06 M-circle dot. The N2H+(10) LTE mass of the envelope along with the inferred infall velocity leads to a mass infall rate of approximately 6 x 10(-6) M-circle dot yr(-1), implying a young age of 10(4) years for this FHSC candidate. Assuming that the accretion onto the central object is the same as the infall rate, we obtain a minimum source size of 1.55 au, consistent with the size expected for a first core. We do not see any evidence of outflow motions or signs of outflowenvelope interaction at scales greater than or similar to 2000 au. This is consistent with previous observations that revealed a very compact outflow (less than or similar to 500 au). We conclude that L1451-mm is indeed at a very early stage of evolution, either a first core or an extremely young Class 0 protostar. Our results provide strong evidence that L1451-mm is the best candidate for being a bona fide first core.
Keywordstars: formation stars: low-mass
DOI10.3847/1538-4357/838/1/60
WOS Keyword1ST HYDROSTATIC CORE ; RADIATION MAGNETOHYDRODYNAMIC SIMULATIONS ; LOW-LUMINOSITY OBJECT ; MOLECULAR CLOUD CORE ; PROTOSTELLAR COLLAPSE ; DENSE CORES ; DARK CLOUDS ; KEPLERIAN DISK ; CIRCUMSTELLAR DISCS ; AMBIPOLAR DIFFUSION
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000401174300012
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/23100
Collection中国科学院紫金山天文台
Corresponding AuthorMaureira, Maira Jose
Affiliation1.Yale Univ, Dept Astron, New Haven, CT 06511 USA
2.State Univ New York Fredonia, Dept Phys, Fredonia, NY 14063 USA
3.Max Planck Inst Extraterr Phys, Giessenbachstr 1, D-85748 Garching, Germany
4.Consejo Nacl Invest Cient & Tecn, CCT La Plata, Inst Argentino Radioastron, CC 5, RA-1894 Villa Elisa, Argentina
5.Chinese Acad Sci, Purple Mt Observ, 2 West Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China
6.Univ Chile, Dept Astron, Casilla 36-D, Santiago, Chile
Recommended Citation
GB/T 7714
Maureira, Maira Jose,Arce, Hector G.,Dunham, Michael M.,et al. Kinematics of a Young Low-mass Star-forming Core: Understanding the Evolutionary State of the First-core Candidate L1451-mm[J]. ASTROPHYSICAL JOURNAL,2017,838(1):15.
APA Maureira, Maira Jose.,Arce, Hector G..,Dunham, Michael M..,Pineda, Jaime E..,Fernandez-Lopez, Manuel.,...&Mardones, Diego.(2017).Kinematics of a Young Low-mass Star-forming Core: Understanding the Evolutionary State of the First-core Candidate L1451-mm.ASTROPHYSICAL JOURNAL,838(1),15.
MLA Maureira, Maira Jose,et al."Kinematics of a Young Low-mass Star-forming Core: Understanding the Evolutionary State of the First-core Candidate L1451-mm".ASTROPHYSICAL JOURNAL 838.1(2017):15.
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