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PMO OpenIR  > 分子云与恒星形成研究团组  > 期刊论文
题名: AN ALMA SEARCH FOR SUBSTRUCTURE, FRAGMENTATION, AND HIDDEN PROTOSTARS IN STARLESS CORES IN CHAMAELEON I
作者: Dunham, Michael M.1; Offner, Stella S. R.2; Pineda, Jaime E.3; Bourke, Tyler L.4; Tobin, John J.5; Arce, Hector G.6; Chen XuePeng(陈学鹏)7; Di Francesco, James8, 9; Johnstone, Doug8, 9, 10; Lee, Katherine I.1; Myers, Philip C.1; Price, Daniel11, 12; Sadavoy, Sarah I.13; Schnee, Scott14
刊名: ASTROPHYSICAL JOURNAL
出版日期: 2016-06-01
卷号: 823, 期号:2
关键词: ISM: clouds ; stars: formation ; stars: low-mass ; submillimeter: ISM
DOI: 10.3847/0004-637X/823/2/160
文章类型: Article
英文摘要: We present an Atacama Large Millimeter/submillimeter Array (ALMA) 106 GHz (Band 3) continuum survey of the complete population of dense cores in the Chamaeleon I molecular cloud. We detect a total of 24 continuum sources in 19 different target fields. All previously known Class 0 and Class I protostars in Chamaeleon I are detected, whereas all of the 56 starless cores in our sample are undetected. We show that the Spitzer+Herschel census of protostars in Chamaeleon I is complete, with the rate at which protostellar cores have been misclassified as starless cores calculated as <1/56, or <2%. We use synthetic observations to show that starless cores collapsing following the turbulent fragmentation scenario are detectable by our ALMA observations when their central densities exceed similar to 10(8) cm(-3), with the exact density dependent on the viewing geometry. Bonnor-Ebert spheres, on the other hand, remain undetected to central densities at least as high as 10(10) cm(-3). Our starless core non-detections are used to infer that either the star-formation rate is declining in Chamaeleon I and most of the starless cores are not collapsing, matching the findings of previous studies, or that the evolution of starless cores are more accurately described by models that develop less substructure than predicted by the turbulent fragmentation scenario, such as Bonnor-Ebert spheres. We outline future work necessary to distinguish between these two possibilities.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: 1ST HYDROSTATIC CORE ; ADAPTIVE MESH REFINEMENT ; C2D LEGACY CLOUDS ; GOULD BELT SURVEY ; SELF-GRAVITATIONAL HYDRODYNAMICS ; 2-DIMENSIONAL RADIATIVE-TRANSFER ; PERSEUS MOLECULAR CLOUD ; DUST CONTINUUM EMISSION ; SPITZER-SPACE-TELESCOPE ; YOUNG STELLAR OBJECTS
收录类别: SCI
项目资助者: National Aeronautics and Space Administration ; National Science Foundation ; Submillimeter Array (SMA) through an SMA postdoctoral fellowship ; NASA(NNX13AE54G) ; NSFC(11473069)
语种: 英语
WOS记录号: WOS:000377410000091
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/16234
Appears in Collections:分子云与恒星形成研究团组_期刊论文

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作者单位: 1.Harvard Smithsonian Ctr Astrophys, 60 Garden St,MS 78, Cambridge, MA 02138 USA
2.Univ Massachusetts, Dept Astron, Amherst, MA 01002 USA
3.Max Planck Inst Extraterr Phys, Giessenbachstr 1, D-85748 Garching, Germany
4.SKA Org Jodrell Bank Observ, Macclesfield SK11 9DL, Cheshire, England
5.Leiden Univ, Leiden Observ, POB 9513, NL-2300 RA Leiden, Netherlands
6.Yale Univ, Dept Astron, POB 208101, New Haven, CT 06520 USA
7.Chinese Acad Sci, Purple Mt Observ, 2 West Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China
8.Natl Res Council Canada, Herzberg Astron Program, 5071 W Saanich Rd, Victoria, BC V9E 2E7, Canada
9.Natl Res Council Canada, Herzberg Astrophys Program, 5071 W Saanich Rd, Victoria, BC V9E 2E7, Canada
10.Univ Victoria, Dept Phys & Astron, Victoria, BC V8P 1A1, Canada
11.Monash Univ, Monash Ctr Astrophys MoCA, Clayton, Vic 3800, Australia
12.Monash Univ, Sch Math Sci, Clayton, Vic 3800, Australia
13.Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany
14.1Natl Radio Astron Observ, 520 Edgemont Rd, Charlottesville, VA 22903 USA
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