The JCMT Gould Belt Survey: first results from the SCUBA-2 observations of the Ophiuchus molecular cloud and a virial analysis of its prestellar core population

	The JCMT Gould Belt Survey: first results from the SCUBA-2 observations of the Ophiuchus molecular cloud and a virial analysis of its prestellar core population
	Pattle, K.1; Ward-Thompson, D.1; Kirk, J. M.1; White, G. J.2,3; Drabek-Maunder, E.4; Buckle, J.5,6; Beaulieu, S. F.7; Berry, D. S.8; Broekhoven-Fiene, H.9; Currie, M. J.8
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2015-06-11
卷号	450 期号:1 页码:1094-1122
关键词	stars: formation dust, extinction ISM: individual objects: L1688 ISM: individual objects: L1689 ISM: kinematics and dynamics submillimetre: ISM
英文摘要	In this paper, we present the first observations of the Ophiuchus molecular cloud performed as part of the James Clerk Maxwell Telescope (JCMT) Gould Belt Survey (GBS) with the SCUBA-2 instrument. We demonstrate methods for combining these data with previous HARP CO, Herschel, and IRAM N2H+ observations in order to accurately quantify the properties of the SCUBA-2 sources in Ophiuchus. We produce a catalogue of all of the sources found by SCUBA-2. We separate these into protostars and starless cores. We list all of the starless cores and perform a full virial analysis, including external pressure. This is the first time that external pressure has been included in this level of detail. We find that the majority of our cores are either bound or virialized. Gravitational energy and external pressure are on average of a similar order of magnitude, but with some variation from region to region. We find that cores in the Oph A region are gravitationally bound prestellar cores, while cores in the Oph C and E regions are pressure-confined. We determine that N2H+ is a good tracer of the bound material of prestellar cores, although we find some evidence for N2H+ freeze-out at the very highest core densities. We find that non-thermal linewidths decrease substantially between the gas traced by (CO)-O-18 and that traced by N2H+, indicating the dissipation of turbulence at higher densities. We find that the critical Bonnor-Ebert stability criterion is not a good indicator of the boundedness of our cores. We detect the pre-brown dwarf candidate Oph B-11 and find a flux density and mass consistent with previous work. We discuss regional variations in the nature of the cores and find further support for our previous hypothesis of a global evolutionary gradient across the cloud from south-west to north-east, indicating sequential star formation across the region.
收录类别	SCI
语种	英语
WOS记录号	WOS:000356311600077
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/5675]
专题	国家天文台_射电天文研究部
作者单位	1.Univ Cent Lancashire, Jeremiah Horrocks Inst, Preston PR1 2HE, Lancs, England 2.Open Univ, Dept Phys Sci, Milton Keynes MK7 6AA, Bucks, England 3.Rutherford Appleton Lab, Didcot OX11 0NL, Oxon, England 4.Univ London Imperial Coll Sci Technol & Med, Blackett Lab, London SW7 2BB, England 5.Univ Cambridge, Cavendish Lab, Astrophys Grp, Cambridge CB3 0HE, England 6.Univ Cambridge, Inst Astron, Kavli Inst Cosmol, Cambridge CB3 0HA, England 7.Univ Waterloo, Dept Phys & Astron, Waterloo, ON N2L 3G1, Canada 8.Joint Astron Ctr, Hilo, HI 96720 USA 9.Univ Victoria, Dept Phys & Astron, Victoria, BC V8P 1A1, Canada 10.Univ Exeter, Phys & Astron, Exeter EX4 4QL, Devon, England
推荐引用方式 GB/T 7714	Pattle, K.,Ward-Thompson, D.,Kirk, J. M.,et al. The JCMT Gould Belt Survey: first results from the SCUBA-2 observations of the Ophiuchus molecular cloud and a virial analysis of its prestellar core population[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2015,450(1):1094-1122.
APA	Pattle, K..,Ward-Thompson, D..,Kirk, J. M..,White, G. J..,Drabek-Maunder, E..,...&Zhu, M..(2015).The JCMT Gould Belt Survey: first results from the SCUBA-2 observations of the Ophiuchus molecular cloud and a virial analysis of its prestellar core population.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,450(1),1094-1122.
MLA	Pattle, K.,et al."The JCMT Gould Belt Survey: first results from the SCUBA-2 observations of the Ophiuchus molecular cloud and a virial analysis of its prestellar core population".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 450.1(2015):1094-1122.