Herschel and SCUBA-2 observations of dust emission in a sample of Planck cold clumps

doi:10.1051/0004-6361/201731921

	Herschel and SCUBA-2 observations of dust emission in a sample of Planck cold clumps
	Juvela, Mika 1; He, Jinhua 2,3,4,5; Pattle, Katherine 6; Liu, Tie 7,8; Bendo, George 9; Eden, David J.10; Feher, Orsolya 11,12; Fich, Michel 13; Fuller, Gary 9; Hirano, Naomi 14
刊名	ASTRONOMY & ASTROPHYSICS
	2018-04-27
卷号	612 页码:38
关键词	ISM: clouds Infrared: ISM Submillimetre: ISM dust, extinction Stars: formation Stars: protostars
ISSN号	1432-0746
DOI	10.1051/0004-6361/201731921
通讯作者	Juvela, Mika(mika.juvela@helsinki.fi)
英文摘要	Context. Analysis of all-sky Planck submillimetre observations and the IRAS 100 mu m data has led to the detection of a population of Galactic cold clumps. The clumps can be used to study star formation and dust properties in a wide range of Galactic environments. Aims. Our aim is to measure dust spectral energy distribution ( SED) variations as a function of the spatial scale and the wavelength. Methods. We examined the SEDs at large scales using IRAS, Planck, and Herschel data. At smaller scales, we compared JCMT/SCUBA-2 850 mu m maps with Herschel data that were filtered using the SCUBA-2 pipeline. Clumps were extracted using the Fellwalker method, and their spectra were modelled as modified blackbody functions. Results. According to IRAS and Planck data, most fields have dust colour temperatures T-C similar to 14-18K and opacity spectral index values of beta = 1.5-1.9. The clumps and cores identified in SCUBA-2 maps have T similar to 13K and similar beta values. There are some indications of the dust emission spectrum becoming flatter at wavelengths longer than 500 mu m. In fits involving Planck data, the significance is limited by the uncertainty of the corrections for CO line contamination. The fits to the SPIRE data give a median beta value that is slightly above 1.8. In the joint SPIRE and SCUBA-2 850 mu m fits, the value decreases to beta similar to 1.6. Most of the observed T-beta anticorrelation can be explained by noise. Conclusions. The typical submillimetre opacity spectral index fi of cold clumps is found to be similar to 1.7. This is above the values of diffuse clouds, but lower than in some previous studies of dense clumps. There is only tentative evidence of a T-beta anticorrelation and beta decreasing at millimetre wavelengths.
WOS关键词	SPECTRAL INDEX ; TEMPERATURE-DEPENDENCE ; DARK CLOUDS ; DENSE CORES ; JCMT ; FIELD ; CATALOG ; MASSES ; NOISE ; MAPS
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	EDP SCIENCES S A
WOS记录号	WOS:000430955300006
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/22015]
专题	中国科学院紫金山天文台
通讯作者	Juvela, Mika
作者单位	1.Univ Helsinki, Dept Phys, POB 64, Helsinki 00014, Finland 2.Chinese Acad Sci, Yunnan Obser, 396 Yangfangwang, Kunming 650216, Yunnan, Peoples R China 3.Chinese Acad Sci, China Chile Joint Ctr Astron, South Amer Ctr Astron, Camino El Observ 1515, Santiago, Chile 4.Chinese Acad Sci, Key Lab Struct & Evolut Celestial Objects, 396 Yangfangwang, Kunming 650216, Yunnan, Peoples R China 5.Chinese Acad Sci, Ctr Astron Mega Sci, 20A Datun Rd, Beijing 100012, Peoples R China 6.Univ Cent Lancashire, Jeremiah Horrocks Inst, Preston PR1 2HE, Lancs, England 7.Korea Astron & Space Sci Inst, 776 Daedeokdaero, Daejeon 34055, South Korea 8.East Asian Observ, 660 N Aohoku Pl, Hilo, HI 96720 USA 9.Univ Manchester, Jodrell Bank Ctr Astrophys, UK ALMA Reg Ctr Node, Oxford Rd, Manchester M13 9PL, Lancs, England 10.Liverpool John Moores Univ, Astrophys Res Inst, Ic2,Liverpool Sci Pk,146 Brownlow Hill, Liverpool L3 5RF, Merseyside, England
推荐引用方式 GB/T 7714	Juvela, Mika,He, Jinhua,Pattle, Katherine,et al. Herschel and SCUBA-2 observations of dust emission in a sample of Planck cold clumps[J]. ASTRONOMY & ASTROPHYSICS,2018,612:38.
APA	Juvela, Mika.,He, Jinhua.,Pattle, Katherine.,Liu, Tie.,Bendo, George.,...&Yoo, Hyunju.(2018).Herschel and SCUBA-2 observations of dust emission in a sample of Planck cold clumps.ASTRONOMY & ASTROPHYSICS,612,38.
MLA	Juvela, Mika,et al."Herschel and SCUBA-2 observations of dust emission in a sample of Planck cold clumps".ASTRONOMY & ASTROPHYSICS 612(2018):38.