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http://dx.doi.org/10.5467/JKESS.2020.41.3.211

A Study of Outer-ring Galaxies within z<0.05  

Chang, Hunhwi (Department of Earth Science Education, Korea National University of Education)
Sohn, Jungjoo (Department of Earth Science Education, Korea National University of Education)
Ahn, Hongbae (Department of Science Education, Pusan National University)
Publication Information
Journal of the Korean earth science society / v.41, no.3, 2020 , pp. 211-221 More about this Journal
Abstract
This study classified outer-ring galaxies using 25,308 galaxies within z=0.05 from the SDSS DR7, which are larger than Rpet>6 arcsec and whose minor-to-major axis ratio (b/a)<0.6. We selected 531 galaxies that have ring-like structures by visual inspection of the color images of 25,308 galaxies; these galaxies with ring-like structures served as a primary sample from which we selected 90 outer-ring galaxies. The final sample of 69 outer-ring galaxies was selected by examining the photometric properties of the candidate galaxies. Their properties were determined by conducting surface photometry on their u, g, r, i, and z images. The frequency of the outer-ring galaxies was found to be 0.3% of the local galaxies. We examined the environment of the outer-ring galaxies using two measures of environment, namely, the projected distance to the nearest-neighbor galaxy and the local background density. We did not observe any notable difference between outer-ring and other galactic environments.
Keywords
SDSS DR7; outer-ring galaxy; photometry; galactic environment;
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Times Cited By KSCI : 2  (Citation Analysis)
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