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A universal relation of dust obscuration across cosmic time
Qin, Jianbo1,2; Zheng, Xian Zhong1; Wuyts, Stijn3; Pan, Zhizheng1; Ren, Jian1,2
2019-06-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume485Issue:4Pages:5733-5751
Corresponding AuthorQin, Jianbo(jbqin@pmo.ac.cn) ; Zheng, Xian Zhong(xzzheng@pmo.ac.cn)
AbstractWe investigate dust obscuration as parametrized by the infrared excess IRX = L-IR/L-UV in relation to global galaxy properties, using a sample of similar to 32 000 local star-forming galaxies (SFGs) selected from SDSS (Sloan Digital Sky Survey), GALEX (Galaxy Evolution Explorer), and WISE (Wide-field Infrared Survey Explorer). We show that IRX generally correlates with stellar mass (M-*), star formation rate, gas-phase metallicity (Z), infrared luminosity (L-IR), and the half-light radius (R-e). A weak correlation of IRX with axial ratio (b/a) is driven by the inclination and thus seen as a projection effect. By examining the tightness and the scatter of these correlations, we find that SFGs obey an empirical relation of the form IRX = 10(alpha) (L-IR)(beta) R-e(gamma)(b/a) (delta), where the power-law indices all increase with metallicity. The best fitting relation yields a scatter of similar to 0.17 dex and no dependence on stellar mass. Moreover, this empirical relation also holds for distant SFGs out to z = 3 in a population-averaged sense, suggesting it to be universal over cosmic time. Our findings reveal that IRX approximately increases with L-IR/R-e([1.3-1.5]) instead of L-IR/R-e(2) (i.e. surface density). We speculate this may be due to differences in the spatial extent of stars versus star formation and/or complex star-dust geometries. We conclude that not stellar mass but IR luminosity, metallicity, and galaxy size are the key parameters jointly determining dust obscuration in SFGs.
Keyworddust, extinction galaxies: evolution galaxies: ISM galaxies: star formation galaxies: statistics
DOI10.1093/mnras/stz763
WOS KeywordMASS-METALLICITY RELATION ; SPECTRAL ENERGY-DISTRIBUTION ; STAR-FORMING GALAXIES ; STELLAR MASS ; OPTICAL EXTINCTION ; FORMATION RATES ; ULTRAVIOLET ; ABSORPTION ; ATTENUATION ; LUMINOSITY
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000474880400094
PublisherOXFORD UNIV PRESS
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/27338
Collection中国科学院紫金山天文台
Corresponding AuthorQin, Jianbo; Zheng, Xian Zhong
Affiliation1.Chinese Acad Sci, Purple Mt Observ, 8 Yuanhua Rd, Nanjing 210034, Jiangsu, Peoples R China
2.Univ Sci & Technol China, Sch Astron & Space Sci, Hefei 230026, Anhui, Peoples R China
3.Univ Bath, Dept Phys, Bath BA2 7AY, Avon, England
Recommended Citation
GB/T 7714
Qin, Jianbo,Zheng, Xian Zhong,Wuyts, Stijn,et al. A universal relation of dust obscuration across cosmic time[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2019,485(4):5733-5751.
APA Qin, Jianbo,Zheng, Xian Zhong,Wuyts, Stijn,Pan, Zhizheng,&Ren, Jian.(2019).A universal relation of dust obscuration across cosmic time.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,485(4),5733-5751.
MLA Qin, Jianbo,et al."A universal relation of dust obscuration across cosmic time".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 485.4(2019):5733-5751.
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