CLUSTERING of INFRARED-BRIGHT DUST-OBSCURED GALAXIES REVEALED by the HYPER SUPRIME-CAM and WISE

We present measurements of the clustering properties of a sample of infrared (IR) bright dust-obscured galaxies (DOGs). Combining 125 deg² of wide and deep optical images obtained with the Hyper Suprime-Cam on the Subaru Telescope and all-sky mid-IR images taken with Wide-Field Infrared Survey Explorer, we have discovered 4367 IR-bright DOGs with and flux density at 22 mJy. We calculate the angular autocorrelation function (ACF) for a uniform subsample of 1411 DOGs with 3.0 mJy < flux (22 ) < 5.0 mJy and < 24.0. The ACF of our DOG subsample is well-fit with a single power law, ω(θ)=(0.010 ± 0.003) , where θ is in degrees. The correlation amplitude of IR-bright DOGs is larger than that of IR-faint DOGs, which reflects a flux dependence of the DOG clustering, as suggested by Brodwin et al. We assume that the redshift distribution for our DOG sample is Gaussian, and consider two cases: (1) the redshift distribution is the same as IR-faint DOGs with flux at 22 < 1.0 mJy, mean and sigma z = 1.99 ±0.45, and (2) z = 1.19 ±0.30, as inferred from their photometric redshifts. The inferred correlation length of IR-bright DOGs is r ₀ = 12.0 ±2.0 and 10.3 ±1.7 Mpc, respectively. IR-bright DOGs reside in massive dark matter halos with a mass of log[〈M_h〉 /(h^-1M⊙)]13.57_-0.55 ^+0.50 and 13.65^+0.45 _-0.52 in the two cases, respectively.