Clustering of infrared-bright dust-obscured galaxies revealed by the Hyper Suprime-Cam and WISE

Abstract

We present measurements of the clustering properties of a sample of infrared (IR) bright dust-obscured galaxies (DOGs). Combining 125 deg${}^2$ of wide and deep optical images obtained with the Hyper Suprime-Cam on the Subaru Telescope and all-sky mid-IR (MIR) images taken with Wide-Field Infrared Survey Explorer, we have discovered 4,367 IR-bright DOGs with $(i-[22]{)}_{\mathrm{AB}}$ $>$ 7.0 and flux density at 22 $\mu$m $>$ 1.0 mJy. We calculate the angular autocorrelation function (ACF) for a uniform subsample of 1411 DOGs with 3.0 mJy $<$ flux (22 $mu$m) $<$ 5.0 mJy and $i_{\mathrm{AB}}$ $<$ 24.0. The ACF of our DOG subsample is well-fit with a single power-law, $\omega (\theta )$ = (0.010 $\pm$ 0.003) ${\theta }^{-0.9}$, where $\theta$ 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. (2008). We assume that the redshift distribution for our DOG sample is Gaussian, and consider 2 cases: (1) the redshift distribution is the same as IR-faint DOGs with flux at 22 $\mu$m $<$ 1.0 mJy, mean and sigma $z$ = 1.99 $\pm$ 0.45, and (2) $z$ = 1.19 $\pm$ 0.30, as inferred from their photometric redshifts. The inferred correlation length of IR-bright DOGs is $r_0$ = 12.0 $\pm$ 2.0 and 10.3 $\pm$ 1.7 $h^{-1}$ Mpc, respectively. IR-bright DOGs reside in massive dark matter halos with a mass of $\log [⟨M_{\mathrm{h}}⟩/(h^{-1}{M}_{\odot })]$ = 13.57${}_{-0.55}^{+0.50}$ and 13.65${}_{-0.52}^{+0.45}$ in the two cases, respectively.

15 pages, 8 figures, and 1 table, accepted for publication in ApJ

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