The Optical–Mid-infrared Extinction Law of the l?=?165° Sightline in the Galactic Plane: Diversity of the Extinction Law in the Diffuse Interstellar Medium

doi:10.3847/1538-4357/aa8db7

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	The Optical–Mid-infrared Extinction Law of the l?=?165° Sightline in the Galactic Plane: Diversity of the Extinction Law in the Diffuse Interstellar Medium
	Wang,Shu 1,2; Jiang,B. W.2; Zhao,He 2; Chen,Xiaodian 3; de Grijs,Richard 1,4
刊名	The Astrophysical Journal
	2017-10-20
卷号	848 期号:2
关键词	dust, extinction infrared: ISM
ISSN号	0004-637X
DOI	10.3847/1538-4357/aa8db7
英文摘要	Abstract Understanding the effects of dust extinction is important to properly interpret observations. The optical total-to-selective extinction ratio, , is widely used to describe extinction variations in ultraviolet and optical bands. Since the extinction curve adequately represents the average extinction law of diffuse regions in the Milky Way, it is commonly used to correct observational measurements along sightlines toward diffuse regions in the interstellar medium. However, the value may vary even along different diffuse interstellar medium sightlines. In this paper, we investigate the optical–mid-infrared (mid-IR) extinction law toward a very diffuse region at in the Galactic plane, which was selected based on a CO emission map. Adopting red clump stars as extinction tracers, we determine the optical–mid-IR extinction law for our diffuse region in two APASS bands ( ), three XSTPS-GAC bands ( ), three 2MASS bands ( ), and two WISE bands ( ). Specifically, 18 red clump stars were selected from the APOGEE–RC catalog based on spectroscopic data in order to explore the diversity of the extinction law. We find that the optical extinction curves exhibit appreciable diversity. The corresponding ranges from 1.7 to 3.8, while the mean value of 2.8 is consistent with the widely adopted average value of 3.1 for Galactic diffuse clouds. There is no apparent correlation between value and color excess in the range of interest, from 0.2 to 0.6 mag, or with specific visual extinction per kiloparsec, .
语种	英语
出版者	The American Astronomical Society
WOS记录号	IOP:0004-637X-848-2-AA8DB7
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/35839]
专题	中国科学院国家天文台
作者单位	1.Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871, China; shuwang@pku.edu.cn 2.Department of Astronomy, Beijing Normal University, Beijing 100875, China; bjiang@bnu.edu.cn 3.Key Laboratory for Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China 4.International Space Science Institute–Beijing, Beijing 100190, China
推荐引用方式 GB/T 7714	Wang,Shu,Jiang,B. W.,Zhao,He,et al. The Optical–Mid-infrared Extinction Law of the l?=?165° Sightline in the Galactic Plane: Diversity of the Extinction Law in the Diffuse Interstellar Medium[J]. The Astrophysical Journal,2017,848(2).
APA	Wang,Shu,Jiang,B. W.,Zhao,He,Chen,Xiaodian,&de Grijs,Richard.(2017).The Optical–Mid-infrared Extinction Law of the l?=?165° Sightline in the Galactic Plane: Diversity of the Extinction Law in the Diffuse Interstellar Medium.The Astrophysical Journal,848(2).
MLA	Wang,Shu,et al."The Optical–Mid-infrared Extinction Law of the l?=?165° Sightline in the Galactic Plane: Diversity of the Extinction Law in the Diffuse Interstellar Medium".The Astrophysical Journal 848.2(2017).