Journal of Astronomy and Space Sciences

The Korean Space Science Society (한국우주과학회)
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Quantitative Morphology of High-Redshift Galaxies Using GALEX Ultraviolet Images of Nearby Galaxies

  • Yeom, Bum-Suk (Department of Astronomy, Space Science, and Geology, Chungnam National University) ;
  • Rey, Soo-Chang (Department of Astronomy, Space Science, and Geology, Chungnam National University) ;
  • Kim, Youngkwang (Department of Astronomy, Space Science, and Geology, Chungnam National University) ;
  • Lee, Youngdae (Korea Astronomy and Space Science Institute) ;
  • Chung, Jiwon (Department of Astronomy, Space Science, and Geology, Chungnam National University) ;
  • Kim, Suk (Korea Astronomy and Space Science Institute) ;
  • Lee, Woong (Department of Astronomy, Space Science, and Geology, Chungnam National University)
  • Received : 2017.08.23
  • Accepted : 2017.09.05
  • Published : 2017.09.15
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Abstract

We present simulations of the optical-band images of high-redshift galaxies utilizing 845 near-ultraviolet (NUV) images of nearby galaxies obtained through the Galaxy Evolution Explorer (GALEX). We compute the concentration (C), asymmetry (A), Gini (G), and $M_{20}$ parameters of the GALEX NUV/Sloan Digital Sky Survey r-band images at z ~ 0 and their artificially redshifted optical images at z = 0.9 and 1.6 in order to quantify the morphology of galaxies at local and high redshifts. The morphological properties of nearby galaxies in the NUV are presented using a combination of morphological parameters, in which early-type galaxies are well separated from late-type galaxies in the $G-M_{20}$, $C-M_{20}$, A-C, and $A-M_{20}$ planes. Based on the distribution of galaxies in the A-C and $G-M_{20}$ planes, we examine the morphological K-correction (i.e., cosmological distance effect and bandshift effect). The cosmological distance effect on the quantitative morphological parameters is found to be significant for early-type galaxies, while late-type galaxies are more greatly affected by the bandshift effect. Knowledge of the morphological K-correction will set the foundation for forthcoming studies on understanding the quantitative assessment of galaxy evolution.

Keywords

References

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