Journal of The Korean Astronomical Society (천문학회지)

The Korean Astronomical Society (한국천문학회)
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CLUSTERING OF EXTREMELY RED OBJECTS IN THE SUBARU GTO 2DEG2 FIELD

  • Shin, Jihey (Department of Astronomy and Atmospheric Sciences, Kyungpook National University) ;
  • Shim, Hyunjin (Department of Earth Science Education, Kyungpook National University) ;
  • Hwang, Ho Seong (Quantum Universe Center, Korea Institute for Advanced Study) ;
  • Ko, Jongwan (Korea Astronomy and Space Science Institute) ;
  • Lee, Jong Chul (Korea Astronomy and Space Science Institute) ;
  • Utsumi, Yousuke (Hiroshima Astrophysical Science Center, Hiroshima University) ;
  • Hwang, Narae (Korea Astronomy and Space Science Institute) ;
  • Park, Byeong-Gon (Korea Astronomy and Space Science Institute)
  • Received : 2017.03.23
  • Accepted : 2017.05.22
  • Published : 2017.06.30
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Abstract

We study the angular correlation function of bright ($K_s{\leq}19.5$) Extremely Red Objects (EROs) selected in the Subaru GTO 2$deg^2$ field. By applying the color selection criteria of $R-K_s$ > 5.0, 5.5, and 6.0, we identify 9055, 4270, and 1777 EROs, respectively. The number density is consistent with similar studies on the optical - NIR color selected red galaxies. The angular correlation functions are derived for EROs with different limiting magnitude and different $R-K_s$ color cut. When we assume that the angular correlation function $w({\theta})$ follows a form of a power-law (i.e., $w({\theta})=A{\theta}^{-{\delta}}$), the value of the amplitude A was larger for brighter EROs compared to the fainter EROs. The result suggests that the brighter, thus more massive high-redshift galaxies, are clustered more strongly compared to the less massive galaxies. Assuming that EROs have redshift distribution centered at ~ 1.1 with ${\sigma}_z=0.15$, the spatial correlation length $r_0$ of the EROs estimated from the observed angular correlation function ranges ${\sim}6-10h^{-1}Mpc$. A comparison with the clustering of dark matter halos in numerical simulation suggests that the EROs are located in most massive dark matter halos and could be progenitors of $L_{\ast}$ elliptical galaxies.

Keywords

References

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