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Author Ye, Chengyun ♦ Lian, Jianhui ♦ Hu, Ning ♦ Kong, Xu ♦ Zou, Hu ♦ Lin, Lin
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword ASTROPHYSICS, COSMOLOGY AND ASTRONOMY ♦ CORRELATIONS ♦ COSMIC DUST ♦ GALAXIES ♦ IMAGES ♦ LUMINOSITY ♦ METALLICITY ♦ SPECTROSCOPY ♦ STAR EVOLUTION ♦ STARS ♦ ULTRAVIOLET RADIATION
Abstract It has been found that the infrared-to-ultraviolet luminosity ratio (IRX) and ultraviolet spectral slope ( β ) have a tight correlation in starburst galaxies, while in normal galaxies the relation is deviated and has a much larger scatter. Star formation regions are much simpler in both morphology and physical properties than galaxies, so their photometric and spectroscopic properties are more easily and accurately determined. We have used the integral field spectroscopy and multiband photometric images to study the IRX– β relation of H ii regions in a nearby galaxy, NGC 628. There are obvious correlations between the D{sub n} (4000), stellar population age, star formation rate, especially H α equivalent width EW(H α), and deviation distance d {sub p} from the starburst IRX– β relation. However, there is little correlation between the Balmer decrement, metallicity, and d {sub p}. It is much more complicated than expected, so that we cannot introduce a single second parameter to describe the scatter and deviation of the H ii region IRX– β relation.
ISSN 0004637X
Educational Use Research
Learning Resource Type Article
Publisher Date 2016-08-01
Publisher Place United States
Journal Astrophysical Journal
Volume Number 826
Issue Number 2


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