THE JCMT GOULD BELT SURVEY: A FIRST LOOK AT DENSE CORES IN ORION B
文献类型：期刊论文
| 作者 | Kirk, H.1; Di Francesco, J.1,2; Johnstone, D.1,2,3; Duarte-Cabral, A.4; Sadavoy, S.5; Hatchell, J.4; Mottram, J. C.5,6; Buckle, J.7,8; Berry, D. S.3; Broekhoven-Fiene, H.2 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2016-02-01 |
| 卷号 | 817期号:2 |
| 关键词 | dust, extinction stars: formation submillimeter: ISM |
| 英文摘要 | We present a first look at the SCUBA-2 observations of three sub-regions of the Orion B molecular cloud: LDN 1622, NGC 2023/2024, and NGC 2068/2071, from the JCMT Gould Belt Legacy Survey. We identify 29, 564, and 322 dense cores in L1622, NGC 2023/2024, and NGC 2068/2071 respectively, using the SCUBA-2 850 mu m map, and present their basic properties, including their peak fluxes, total fluxes, and sizes, and an estimate of the corresponding 450 mu m peak fluxes and total fluxes, using the FellWalker source extraction algorithm. Assuming a constant temperature of 20 K, the starless dense cores have a mass function similar to that found in previous dense core analyses, with a Salpeter-like slope at the high-mass end. The majority of cores appear stable to gravitational collapse when considering only thermal pressure; indeed, most of the cores which have masses above the thermal Jeans mass are already associated with at least one protostar. At higher cloud column densities, above 1-2 x 10(23) cm(-2), most of the mass is found within dense cores, while at lower cloud column densities, below 1 x 10(23) cm(-2), this fraction drops to 10% or lower. Overall, the fraction of dense cores associated with a protostar is quite small (< 8%), but becomes larger for the densest and most centrally concentrated cores. NGC 2023/2024 and NGC 2068/2071 appear to be on the path to forming a significant number of stars in the future, while L1622 has little additional mass in dense cores to form many new stars. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000369437900084 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/5431]  |
| 专题 | 国家天文台_射电天文研究部 |
| 作者单位 | 1.NRC Herzberg Astron & Astrophys, 5071 W Saanich Rd, Victoria, BC V9E 2E7, Canada 2.Univ Victoria, Dept Phys & Astron, Victoria, BC V8P 1A1, Canada 3.Joint Astron Ctr, Hilo, HI 96720 USA 4.Univ Exeter, Phys & Astron, Exeter EX4 4QL, Devon, England 5.Max Planck Inst Astron, D-69117 Heidelberg, Germany 6.Leiden Univ, Leiden Observ, NL-2300 RA Leiden, Netherlands 7.Cavendish Lab, Astrophys Grp, Cambridge CB3 0HE, England 8.Univ Cambridge, Inst Astron, Kavli Inst Cosmol, Cambridge CB3 0HA, England 9.Univ Waterloo, Dept Phys & Astron, Waterloo, ON N2L 3G1, Canada 10.LSST Project Off, Tucson, AZ 85719 USA |
| 推荐引用方式 GB/T 7714 | Kirk, H.,Di Francesco, J.,Johnstone, D.,et al. THE JCMT GOULD BELT SURVEY: A FIRST LOOK AT DENSE CORES IN ORION B[J]. ASTROPHYSICAL JOURNAL,2016,817(2). |
| APA | Kirk, H..,Di Francesco, J..,Johnstone, D..,Duarte-Cabral, A..,Sadavoy, S..,...&Zhu, M..(2016).THE JCMT GOULD BELT SURVEY: A FIRST LOOK AT DENSE CORES IN ORION B.ASTROPHYSICAL JOURNAL,817(2). |
| MLA | Kirk, H.,et al."THE JCMT GOULD BELT SURVEY: A FIRST LOOK AT DENSE CORES IN ORION B".ASTROPHYSICAL JOURNAL 817.2(2016). |
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来源：国家天文台
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