CLUSTERING OF EXTREMELY RED OBJECTS IN THE SUBARU GTO 2DEG 2 FIELD
2017; Korean Astronomical Society; Volume: 50; Issue: 3 Linguagem: Inglês
10.5303/jkas.2017.50.3.61
ISSN2288-890X
AutoresJihey Shin, Hyunjin Shim, Ho Seong Hwang, Jongwan Ko, Jong Chul Lee, Yousuke Utsumi, Narae Hwang, Byeong-Gon Park,
Tópico(s)Galaxies: Formation, Evolution, Phenomena
ResumoWe 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.
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