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CHARACTERIZING ULTRAVIOLET AND INFRARED OBSERVATIONAL PROPERTIES FOR GALAXIES. II. FEATURES OF ATTENUATION LAW
Mao, Ye-Wei1,2,3; Kong, Xu2,3; Lin, Lin4
2014-07-01
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume789Issue:1Pages:0
AbstractVariations in the attenuation law have a significant impact on observed spectral energy distributions for galaxies. As one important observational property for galaxies at ultraviolet and infrared wavelength bands, the correlation between infrared-to-ultraviolet luminosity ratio and ultraviolet color index (or ultraviolet spectral slope), i.e., the IRX-UV relation (or IRX-beta relation), offered a widely used formula for correcting dust attenuation in galaxies, but the usability appears to be in doubt now because of considerable dispersion in this relation found by many studies. In this paper, on the basis of spectral synthesis modeling and spatially resolved measurements of four nearby spiral galaxies, we provide an interpretation of the deviation in the IRX-UV relation with variations in the attenuation law. From both theoretical and observational viewpoints, two components in the attenuation curve, the linear background and the 2175 angstrom bump, are suggested to be the parameters in addition to the stellar population age (addressed in the first paper of this series) in the IRX-UV function; different features in the attenuation curve are diagnosed for the galaxies in our sample. Nevertheless, it is often difficult to ascertain the attenuation law for galaxies in actual observations. Possible reasons for preventing the successful detection of the parameters in the attenuation curve are also discussed in this paper, including the degeneracy of the linear background and the 2175 angstrom bump in observational channels, the requirement for young and dust-rich systems to study, and the difficulty in accurate estimates of dust attenuations at different wavelength bands.
KeywordDust, Extinction Galaxies: Ism Galaxies: Spiral Infrared: Galaxies Ultraviolet: Galaxies
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1088/0004-637X/789/1/76
WOS KeywordSTAR-FORMING GALAXIES ; LARGE-MAGELLANIC-CLOUD ; STELLAR POPULATION PROPERTIES ; INTERSTELLAR EXTINCTION BAND ; FORMATION RATE INDICATORS ; GRAIN-SIZE DISTRIBUTIONS ; INITIAL MASS FUNCTION ; ANGSTROM DUST FEATURE ; DIGITAL SKY SURVEY ; IRX-BETA RELATION
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Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000338103400076
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/10581
Collection毫米波和亚毫米波技术实验室
Affiliation1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
2.Univ Sci & Technol China, Ctr Astrophys, Hefei 230026, Peoples R China
3.Chinese Acad Sci, USTC, Key Lab Res Galaxies & Cosmol, Hefei 230026, Peoples R China
4.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China
Recommended Citation
GB/T 7714
Mao, Ye-Wei,Kong, Xu,Lin, Lin. CHARACTERIZING ULTRAVIOLET AND INFRARED OBSERVATIONAL PROPERTIES FOR GALAXIES. II. FEATURES OF ATTENUATION LAW[J]. ASTROPHYSICAL JOURNAL,2014,789(1):0.
APA Mao, Ye-Wei,Kong, Xu,&Lin, Lin.(2014).CHARACTERIZING ULTRAVIOLET AND INFRARED OBSERVATIONAL PROPERTIES FOR GALAXIES. II. FEATURES OF ATTENUATION LAW.ASTROPHYSICAL JOURNAL,789(1),0.
MLA Mao, Ye-Wei,et al."CHARACTERIZING ULTRAVIOLET AND INFRARED OBSERVATIONAL PROPERTIES FOR GALAXIES. II. FEATURES OF ATTENUATION LAW".ASTROPHYSICAL JOURNAL 789.1(2014):0.
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