Dust-Gas Scaling Relations and OH Abundance in the Galactic ISM

doi:10.3847/1538-4357/aac82b

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	Dust-Gas Scaling Relations and OH Abundance in the Galactic ISM
	Nguyen, Hiep 1,2,3; Dawson, J. R.1,2,3; Miville-Deschenes, M-A 4,5; Tang, Ningyu 6; Li, Di 6,7; Heiles, Carl 8; Murray, Claire E.9; Stanimirovic, Snezana 10; Gibson, Steven J.11; McClure-Griffiths, N. M.12
刊名	ASTROPHYSICAL JOURNAL
	2018-07-20
卷号	862 期号:1 页码:18
关键词	dust, extinction ISM: clouds ISM: molecules
ISSN号	0004-637X
DOI	10.3847/1538-4357/aac82b
英文摘要	Observations of interstellar dust are often used as a proxy for total gas column density N-H. By comparing Planck thermal dust data (Release 1.2) and new dust reddening maps from Pan-STARRS 1 and 2MASS, with accurate (opacity-corrected) H I column densities and newly published OH data from the Arecibo Millennium survey and 21-SPONGE, we confirm linear correlations between dust optical depth tau(353), reddening E(B - V), and the total proton column density N-H in the range (1-30) x 10(20) cm(-2), along sightlines with no molecular gas detections in emission. We derive an N-H/E(B - V) ratio of (9.4 +/- 1.6) x 10(21) cm(-2) mag(-1) for purely atomic sightlines at \|b\| > 5 degrees, which is 60% higher than the canonical value of Bohlin et al. We report a similar to 40% increase in opacity sigma(353) = tau(353)/N-H, when moving from the low column density (N-H < 5 x 10(20) cm(-2)) to the moderate column density (N-H > 5 x 10(20) cm(-2)) regime, and suggest that this rise is due to the evolution of dust grains in the atomic interstellar medium. Failure to account for H I opacity can cause an additional apparent rise in sigma(353) of the order of a further similar to 20%. We estimate molecular hydrogen column densities N-H2 from our derived linear relations, and hence derive the OH/H-2. abundance ratio of X-OH similar to 1 x 10(-7) for all molecular sightlines. Our results show no evidence of systematic trends in OH abundance with N-H2 in the range N-H2 similar to (0.1-10) x 10(21) cm(-2). This suggests that OH may be used as a reliable proxy for H-2. in this range, which includes sightlines with both CO-dark and CO-bright gas.
资助项目	Australian Research Council (ARC) DECRA Fellowship[DE170101086] ; National Key R&D Program of China[2017YFA0402600] ; CAS International Partnership Program[114A11KYSB20160008] ; ARC through Future Fellowship[FT150100024] ; CONICYT[PFB06] ; National Aeronautics and Space Administration
WOS关键词	INTERSTELLAR MOLECULAR-HYDROGEN ; ABSORPTION-LINE SURVEY ; WARM NEUTRAL HALOS ; X-RAY-ABSORPTION ; H-I ; ALPHA ABSORPTION ; MILKY-WAY ; PHOTODISSOCIATION REGIONS ; OPTICAL EXTINCTION ; INFRARED-EMISSION
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000439334300016
资助机构	Australian Research Council (ARC) DECRA Fellowship ; Australian Research Council (ARC) DECRA Fellowship ; National Key R&D Program of China ; National Key R&D Program of China ; CAS International Partnership Program ; CAS International Partnership Program ; ARC through Future Fellowship ; ARC through Future Fellowship ; CONICYT ; CONICYT ; National Aeronautics and Space Administration ; National Aeronautics and Space Administration ; Australian Research Council (ARC) DECRA Fellowship ; Australian Research Council (ARC) DECRA Fellowship ; National Key R&D Program of China ; National Key R&D Program of China ; CAS International Partnership Program ; CAS International Partnership Program ; ARC through Future Fellowship ; ARC through Future Fellowship ; CONICYT ; CONICYT ; National Aeronautics and Space Administration ; National Aeronautics and Space Administration ; Australian Research Council (ARC) DECRA Fellowship ; Australian Research Council (ARC) DECRA Fellowship ; National Key R&D Program of China ; National Key R&D Program of China ; CAS International Partnership Program ; CAS International Partnership Program ; ARC through Future Fellowship ; ARC through Future Fellowship ; CONICYT ; CONICYT ; National Aeronautics and Space Administration ; National Aeronautics and Space Administration ; Australian Research Council (ARC) DECRA Fellowship ; Australian Research Council (ARC) DECRA Fellowship ; National Key R&D Program of China ; National Key R&D Program of China ; CAS International Partnership Program ; CAS International Partnership Program ; ARC through Future Fellowship ; ARC through Future Fellowship ; CONICYT ; CONICYT ; National Aeronautics and Space Administration ; National Aeronautics and Space Administration
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/20870]
专题	中国科学院国家天文台
通讯作者	Nguyen, Hiep
作者单位	1.Macquarie Univ, MQ Res Ctr Astron, N Ryde, NSW 2109, Australia 2.Macquarie Univ, Dept Phys & Astron, N Ryde, NSW 2109, Australia 3.CSIRO Astron & Space Sci, Australia Telescope Natl Facil, POB 76, Epping, NSW 1710, Australia 4.Univ Paris Saclay, Univ Paris Sud, CNRS, Inst Astrophys Spatiale, Bat 121, F-91405 Orsay, France 5.Univ Paris Diderot, Lab AIM, CEA IRFU DAp, CNRS, F-91191 Gif Sur Yvette, France 6.Chinese Acad Sci, NAOC, CAS Key Lab FAST, Beijing, Peoples R China 7.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 8.Univ Calif Berkeley, Dept Astron, 601 Campbell Hall 3411, Berkeley, CA 94720 USA 9.Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21218 USA 10.Univ Wisconsin, Dept Astron, 475 North Charter St, Madison, WI 53706 USA
推荐引用方式 GB/T 7714	Nguyen, Hiep,Dawson, J. R.,Miville-Deschenes, M-A,et al. Dust-Gas Scaling Relations and OH Abundance in the Galactic ISM[J]. ASTROPHYSICAL JOURNAL,2018,862(1):18.
APA	Nguyen, Hiep.,Dawson, J. R..,Miville-Deschenes, M-A.,Tang, Ningyu.,Li, Di.,...&Finger, R..(2018).Dust-Gas Scaling Relations and OH Abundance in the Galactic ISM.ASTROPHYSICAL JOURNAL,862(1),18.
MLA	Nguyen, Hiep,et al."Dust-Gas Scaling Relations and OH Abundance in the Galactic ISM".ASTROPHYSICAL JOURNAL 862.1(2018):18.