Catalog of High Protostellar Surface Density Regions in Nearby Embedded Clusters

doi:10.3847/1538-4357/aaf652

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	Catalog of High Protostellar Surface Density Regions in Nearby Embedded Clusters
	Li, Juan 2,3; Myers, Philip C.4; Kirk, Helen 1,5; Gutermuth, Robert A.6; Dunham, Michael M.4,7; Pokhrel, Riwaj 4,6
刊名	ASTROPHYSICAL JOURNAL
	2019-02-01
卷号	871 期号:2 页码:18
关键词	infrared: stars stars: formation stars: low-mass stars: pre-main sequence stars: protostars
ISSN号	0004-637X
DOI	10.3847/1538-4357/aaf652
英文摘要	We analyze high-quality stellar catalogs for 24 young and nearby (within 1 kpc) embedded clusters and present a catalog of 32 groups which have a high concentration of protostars. The median effective radius of these groups is 0.17 pc. The median protostellar and pre-main-sequence star surface densities are 46 M-circle dot pc(-2) and 11 M-circle dot pc(-2), respectively. We estimate the age of these groups using a model of constant birthrate and random accretion stopping and find a median value of 0.25 Myr. Some groups in Aquila, Serpens, Corona Australia, and Ophichus L1688 show high protostellar surface density and high molecular gas surface density, and seem to be undergoing vigorous star formation. These groups provide an excellent opportunity to study the initial conditions of clustered star formation. Comparisons of protostellar and pre-main-sequence stellar surface densities reveal continuous low-mass star formation of these groups over several Myr in some clouds. For groups with typical protostellar separations of less than 0.4 pc, we find that these separations agree well with the thermal Jeans fragmentation scale. On the other hand, for groups with typical protostellar separations larger than 0.4 pc, these separations are always larger than the associated Jeans length.
资助项目	East Asian Observatory ; National Natural Science Foundation of China[11590780] ; National Natural Science Foundation of China[11590784] ; National Natural Science Foundation of China[11773054] ; National Natural Science Foundation of China[U1731237] ; Key Laboratory for Radio Astronomy, CAS ; NASA ADAP[NNX11AD14G] ; NASA ADAP[NNX15AF05G] ; NASA ADAP[NNX17AF24G] ; NASA JPL/Caltech[1489384] ; NSF of TolTEC[AST 1636621]
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000457181200017
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/31953]
专题	中国科学院上海天文台
通讯作者	Li, Juan
作者单位	1.Univ Victoria, Dept Phys & Astron, 3800 Finnerty Rd, Victoria, BC V8P 5C2, Canada 2.Chinese Acad Sci, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China 3.Chinese Acad Sci, Key Lab Radio Astron, 2 West Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China 4.Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA 5.Univ Victoria, Dept Phys & Astron, Victoria, BC V8P 1A1, Canada 6.Univ Massachusetts, Dept Astron, Amherst, MA 01003 USA 7.SUNY Coll Fredonia, Dept Phys, 280 Cent Ave, Fredonia, NY 14063 USA
推荐引用方式 GB/T 7714	Li, Juan,Myers, Philip C.,Kirk, Helen,et al. Catalog of High Protostellar Surface Density Regions in Nearby Embedded Clusters[J]. ASTROPHYSICAL JOURNAL,2019,871(2):18.
APA	Li, Juan,Myers, Philip C.,Kirk, Helen,Gutermuth, Robert A.,Dunham, Michael M.,&Pokhrel, Riwaj.(2019).Catalog of High Protostellar Surface Density Regions in Nearby Embedded Clusters.ASTROPHYSICAL JOURNAL,871(2),18.
MLA	Li, Juan,et al."Catalog of High Protostellar Surface Density Regions in Nearby Embedded Clusters".ASTROPHYSICAL JOURNAL 871.2(2019):18.