Physical properties, kinematics and mass function of 12 northern infrared dark clouds

	Physical properties, kinematics and mass function of 12 northern infrared dark clouds
	Liu, Xiao-Lan1,2 ; Wang, Jun-Jie1,3 ; Xu, Jin-Long1,3
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2014-09-21
卷号	443 期号:3 页码:2264-2284
关键词	stars: formation ISM: clouds ISM: evolution ISM: general ISM: kinematics and dynamics ISM: molecules
英文摘要	The physical, chemical and kinetic characteristics of 12 northern infrared dark clouds (IRDCs) are systematic studied using the (CO)-C-13 (1-0) and (CO)-O-18 (1-0) lines, observed with the Purple Mountain Observatory 13.7 m radio telescope, the 1.1 mm Bolocam Galactic Plane Survey data and Galactic Legacy Infrared Mid-Plane Survey Extraordinaire Spitzer Infrared Array Camera 8 mu m data. The molecular lines emission and 1.1 mm continuum emission almost coincide in morphology for each IRDC and both are associated well with the IRDCs. 10 IRDCs present the filamentary structure and substructures. Totally, 41 IRDC cores are identified, and a statistic research for them shows that the northern IRDC cores have a typical excitation temperature of 8-10 K, an integrated intensity ratio of (CO)-C-13 to (CO)-O-18 of 3-6 and the column density (1-6) x 10(22) cm(-2). About 57.5 per cent of the IRDC cores are gravitationally bound, which are more compact, warmer and denser. In addition, we study the mass distribution functions of the whole IRDC cores as well as the gravitationally bound cores, finding that they almost have the same power-law indices. This indicates that the evolution of the IRDC cores almost has no effect on the mass spectrum of the molecular cores and thus can be used to study the stellar initial mass function. Moreover, three IRDC cores G24.00-3, G31.38-1 and G34.43-4 are detected to have large-scaled infall motions. Two different outflows are further found for the IRDC core G34.43-4 and one of them is in high collimation.
收录类别	SCI
语种	英语
WOS记录号	WOS:000342920400028
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/6473]
专题	国家天文台_射电天文研究部
作者单位	1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China 3.NAOC TU Joint Ctr Astrophys, Lhasa 850000, Peoples R China
推荐引用方式 GB/T 7714	Liu, Xiao-Lan,Wang, Jun-Jie,Xu, Jin-Long. Physical properties, kinematics and mass function of 12 northern infrared dark clouds[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2014,443(3):2264-2284.
APA	Liu, Xiao-Lan,Wang, Jun-Jie,&Xu, Jin-Long.(2014).Physical properties, kinematics and mass function of 12 northern infrared dark clouds.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,443(3),2264-2284.
MLA	Liu, Xiao-Lan,et al."Physical properties, kinematics and mass function of 12 northern infrared dark clouds".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 443.3(2014):2264-2284.