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The Behavior of Selected Diffuse Interstellar Bands with Molecular Fraction in Diffuse Atomic and Molecular Clouds

文献类型：期刊论文

作者Friedman, Scott D.9; Snow, Theodore P.7; Sherman, Reid1; Zhao, Gang3,8; Hobbs, Lewis M.5; Fan, Haoyu3,8; Baskes, Noah10; Jiang, Zihao10; Rachford, Brian6; Dahlstrom, Julie A.4
刊名ASTROPHYSICAL JOURNAL
出版日期2017-12-01
卷号850期号:2
关键词Ism: Clouds Dust Ism: Lines And bAnds Extinction Ism: Molecules
DOI10.3847/1538-4357/aa9480
文献子类Article
英文摘要We study the behavior of eight diffuse interstellar bands (DIBs) in different interstellar environments, as characterized by the fraction of hydrogen in molecular form (f(H2)), with comparisons to the corresponding behavior of various known atomic and molecular species. The equivalent widths of the five "normal" DIBs (lambda lambda 5780.5, 5797.1, 6196.0, 6283.8, and 6613.6), normalized to EB-V, show a "lambda-shaped" behavior: they increase at low f(H2), peak at f(H2) similar to 0.3, and then decrease. The similarly normalized column densities of Ca, Ca+, Ti+, and CH+ also decline for f(H2) > 0.3. In contrast, the normalized column densities of Na, K, CH, CN, and CO increase monotonically with f(H2), and the trends exhibited by the three C-2 DIBs (lambda lambda 4726.8, 4963.9, and 4984.8) lie between those two general behaviors. These trends with f(H2) are accompanied by cosmic scatter, the dispersion at any given fH2 being significantly larger than the individual errors of measurement. The lambda-shaped trends suggest the balance between creation and destruction of the DIB carriers differs dramatically between diffuse atomic and diffuse molecular clouds; additional processes aside from ionization and shielding are needed to explain those observed trends. Except for several special cases, the highest W-lambda(5780)/W-lambda(5797) ratios, characterizing the so-called "sigma-zeta effect," occur only at f(H2) < 0.2. We propose a sequence of DIBs based on trends in their pair-wise strength ratios with increasing f(H2). In order of increasing environmental density, we find the lambda 6283.8 and lambda 5780.5 DIBs, the lambda 6196.0 DIB, the lambda 6613.6 DIB, the lambda 5797.1 DIB, and the C-2 DIBs.
WOS关键词HIGH-RESOLUTION SURVEY ; TRANSLUCENT SIGHT LINES ; LARGE-MAGELLANIC-CLOUD ; DIGITAL SKY SURVEY ; ECHELLE SPECTROGRAPH ; ABSORPTION-LINES ; FINE-STRUCTURE ; ZETA-OPHIUCHI ; 6614 ANGSTROM ; OF-SIGHT
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:000425475100001
资助机构National Natural Science Foundation of China(11390371 ; National Natural Science Foundation of China(11390371 ; NSF(AST-1009603 ; NSF(AST-1009603 ; 11233004 ; 11233004 ; AST-1238926 ; AST-1238926 ; 11603033) ; 11603033) ; AST-1008424 ; AST-1008424 ; AST-1009929 ; AST-1009929 ; AST-1008801) ; AST-1008801) ; National Natural Science Foundation of China(11390371 ; National Natural Science Foundation of China(11390371 ; NSF(AST-1009603 ; NSF(AST-1009603 ; 11233004 ; 11233004 ; AST-1238926 ; AST-1238926 ; 11603033) ; 11603033) ; AST-1008424 ; AST-1008424 ; AST-1009929 ; AST-1009929 ; AST-1008801) ; AST-1008801)
源URL[http://ir.bao.ac.cn/handle/114a11/20298]  
专题国家天文台_光学天文研究部
作者单位1.US Global Change Res Program, 1800 G St NW,Suite 9100, Washington, DC 20006 USA
2.European Space Agcy, Paris, France
3.Chinese Acad Sci, Key Lab Opt Astron, Natl Astron Observ, Datun Rd 20A, Beijing 100012, Peoples R China
4.Carthage Coll, Dept Phys & Astron, Straz Ctr 94, 2001 Alford Pk Dr, Kenosha, WI 53140 USA
5.Univ Chicago, Yerkes Observ, 373 W Geneva St, Williams Bay, WI 53191 USA
6.Embry Riddle Aeronaut Univ, 3700 Willow Creek Rd, Prescott, AZ 86303 USA
7.Univ Colorado, 2000 Colorado Ave,Duane Phys Bldg,Rm E226, Boulder, CO 80309 USA
8.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
9.Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21218 USA
10.Univ Chicago, Dept Astron & Astrophys, 5640 S Ellis Ave,ERC 577, Chicago, IL 60615 USA
推荐引用方式
GB/T 7714		 Friedman, Scott D.,Snow, Theodore P.,Sherman, Reid,et al. The Behavior of Selected Diffuse Interstellar Bands with Molecular Fraction in Diffuse Atomic and Molecular Clouds[J]. ASTROPHYSICAL JOURNAL,2017,850(2).
APA Friedman, Scott D..,Snow, Theodore P..,Sherman, Reid.,Zhao, Gang.,Hobbs, Lewis M..,...&Welty, Daniel E..(2017).The Behavior of Selected Diffuse Interstellar Bands with Molecular Fraction in Diffuse Atomic and Molecular Clouds.ASTROPHYSICAL JOURNAL,850(2).
MLA Friedman, Scott D.,et al."The Behavior of Selected Diffuse Interstellar Bands with Molecular Fraction in Diffuse Atomic and Molecular Clouds".ASTROPHYSICAL JOURNAL 850.2(2017).

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