中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
首页 机构 成果 学者
  
  1. CAS IR Grid
  2. 国家天文台
  3. 中国科学院国家天文台
  4. 光学天文研究部
The gas-to-extinction ratio and the gas distribution in the Galaxy

文献类型：期刊论文

作者Li, Aigen1; Zhang, Mengfei3,4; Zhu, Hui1,2,3; Tian, Wenwu3,4,5
刊名MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
出版日期2017-11-01
卷号471期号:3页码:3494-3528
关键词Planetary Nebulae: General Dust Ism: Supernova Remnants Extinction X-rays: Binaries
DOI10.1093/mnras/stx1580
文献子类Article
英文摘要We 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.
WOS关键词X-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
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:000409035700071
资助机构NSFC(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)
源URL[http://ir.bao.ac.cn/handle/114a11/20138]  
专题国家天文台_光学天文研究部
作者单位1.Univ Missouri, Dept Phys & Astron, Columbia, MO 65211 USA
2.Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA
3.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China
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
推荐引用方式
GB/T 7714		 Li, Aigen,Zhang, Mengfei,Zhu, Hui,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 Li, Aigen,Zhang, Mengfei,Zhu, Hui,&Tian, Wenwu.(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 Li, Aigen,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.

入库方式： OAI收割

来源：国家天文台

浏览0
下载0
收藏0
其他版本

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。