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- W1500594080 abstract "In order to understand nature of building blocks of galaxies in the early universe, we investigate genuine irregular galaxies (GIGs) in the nearby universe. Here, GIGs are defined as isolated galaxies without regular structures (spheroid, bulge, disk, bar, spiral arm, and nucleus). Using the results of two excellent studies on galaxy morphology based on the Sloan Digital Sky Survey (SDSS), we obtain a sample of 66 irregular galaxies. We carry out new classification of them into GIGs and non-GIGs which have regular structure or show evidence for galaxy interaction, by using the SDSS Data Release 10 images. We then find that a half of these irregular galaxies (33/66) are GIGs and obtain an unambiguous sample of 33 GIGs for the first time. We discuss their observational properties by comparing them with those of elliptical, S0, spiral galaxies, and irregular galaxies without the GIGs. We find that our GIGs have smaller sizes, lower optical luminosities, bluer rest-frame optical colors, lower surface stellar mass densities, and lower gas metallicity than normal galaxies. All these properties suggest that they are in chemically and dynamically younger phases even in the nearby universe." @default.
- W1500594080 created "2016-06-24" @default.
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- W1500594080 date "2013-12-02" @default.
- W1500594080 modified "2023-09-27" @default.
- W1500594080 title "Genuine Irregular Galaxies as a Relic of Building Blocks of Galaxies" @default.
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