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The gas-to-extinction ratio and the gas distribution in the Galaxy
Zhu, Hui1,2,3; Tian, Wenwu1,4,5; Li, Aigen3; Zhang, Mengfei1,4
2017-11-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume471Issue:3Pages:3494-3528
AbstractWe investigate the relation between the optical extinction (AV) and the hydrogen column density (N-H) determined from X-ray observations of a large sample of Galactic sightlines towards 35 supernova remnants, 6 planetary nebulae and 70 X-ray binaries for which NH was determined in the literature with solar abundances. We derive an average ratio of < N-H/A(V)> = (2.08 +/- 0.02) x 10(21) H cm(-2) mag(-1) for the whole Galaxy. We find no correlation between < N-H/A(V)> and the number density of hydrogen, the distance away from the Galactic Centre and the distance above or below the Galactic plane. The < N-H/A(V)> ratio is generally invariant across the Galaxy, with < NH/AV > = (2.04 +/- 0.05) x 10(21) H cm(-2) mag(-1) for the first and fourth Galactic quadrants and < N-H/A(V)> = (2.09 +/- 0.03) x10(21) H cm(-2) mag(-1) for the second and third Galactic quadrants. We also explore the distribution of hydrogen in the Galaxy by enlarging our sample with additional 74 supernova remnants for which both NH and distances are known. We find that, between the Galactic radius of 2 and 10 kpc, the vertical distribution of hydrogen can be roughly described by a Gaussian function with a scaleheight of h = 75.5 +/- 12.4 pc and a mid-plane density of n(H)(0) = 1.11 +/- 0.15 cm(-3), corresponding to a total gas surface density of Sigma(gas) similar to 7.0M(circle dot) pc(-2). We also compile N-H from 19 supernova remnants and 29 X-ray binaries for which NH was determined with subsolar abundances. We obtain < N-H/A(V)> = (2.47 +/- 0.04) x 10(21) H cm(-2) mag(-1) which exceeds that derived with solar abundances by similar to 20 per cent. We suggest that in future studies one may simply scale N-H derived from subsolar abundances by a factor of similar to 1.2 when converting to NH of solar abundances.
SubtypeArticle
KeywordPlanetary Nebulae: General Dust Ism: Supernova Remnants Extinction X-rays: Binaries
WOS HeadingsScience & Technology ; Physical Sciences
Funding OrganizationNSFC(10273025 ; NSFC(10273025 ; NSF(AST-1311804) ; NSF(AST-1311804) ; NASA(NNX14AF68G) ; NASA(NNX14AF68G) ; 11473038 ; 11473038 ; 11603039) ; 11603039) ; NSFC(10273025 ; NSFC(10273025 ; NSF(AST-1311804) ; NSF(AST-1311804) ; NASA(NNX14AF68G) ; NASA(NNX14AF68G) ; 11473038 ; 11473038 ; 11603039) ; 11603039)
DOI10.1093/mnras/stx1580
WOS KeywordX-RAY BINARY ; GALACTIC SUPERNOVA REMNANT ; PULSAR WIND NEBULA ; XMM-NEWTON OBSERVATIONS ; CANDIDATE SWIFT J1753.5-0127 ; DEEP CHANDRA OBSERVATIONS ; HIGH-RESOLUTION SPECTROSCOPY ; GLOBULAR-CLUSTER NGC-6712 ; BROAD-BAND SPECTRUM ; OPTICAL LIGHT-CURVE
Indexed BySCI
Language英语
Funding OrganizationNSFC(10273025 ; NSFC(10273025 ; NSF(AST-1311804) ; NSF(AST-1311804) ; NASA(NNX14AF68G) ; NASA(NNX14AF68G) ; 11473038 ; 11473038 ; 11603039) ; 11603039) ; NSFC(10273025 ; NSFC(10273025 ; NSF(AST-1311804) ; NSF(AST-1311804) ; NASA(NNX14AF68G) ; NASA(NNX14AF68G) ; 11473038 ; 11473038 ; 11603039) ; 11603039)
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000409035700071
Citation statistics
Cited Times:13[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/20138
Collection光学天文研究部
Affiliation1.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China
2.Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA
3.Univ Missouri, Dept Phys & Astron, Columbia, MO 65211 USA
4.Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing 100049, Peoples R China
5.Univ Calgary, Dept Phys & Astron, Calgary, AB T2N 1N4, Canada
Recommended Citation
GB/T 7714
Zhu, Hui,Tian, Wenwu,Li, Aigen,et al. The gas-to-extinction ratio and the gas distribution in the Galaxy[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2017,471(3):3494-3528.
APA Zhu, Hui,Tian, Wenwu,Li, Aigen,&Zhang, Mengfei.(2017).The gas-to-extinction ratio and the gas distribution in the Galaxy.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,471(3),3494-3528.
MLA Zhu, Hui,et al."The gas-to-extinction ratio and the gas distribution in the Galaxy".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 471.3(2017):3494-3528.
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