Oral Presentation

Photometric properties of IR bright Dust Obscured Galaxies

Author(s): Yoshiki Toba , Tohru Nagao (Ehime University), and the HSC project (#34) members

Presenter: Yoshiki Toba (Ehime University)

We present the photometric properties of infrared (IR) bright dust obscured galaxies (DOGs). DOGs are a subset of high-redshift (z ~2) optically-faint ultra-luminous infrared galaxies (ULIRGs), and are expected to be a crucial population to detect "growing black holes (BHs)".
Combining the Hyper Supreme-Cam (HSC) on Subaru and Wide-Field Infrared Survey Explorer (WISE), we discovered 26 D0Gs in the GAMA 14hr field (~18 square degrees). Among them, 19 (~73 %) DOGs are power-law (AGN-dominated) DOGs and 7 (~27 %) DOGs are bump (SF-dominated DOGs). Assuming that their redshift distributions are 1.99 +/- 0.45 (Dey et al.2008), we calculated their total IR luminosity that was estimated from an empirical relation between 22 µm luminosity and total IR luminosity. The average value of total IR luminosity is (2.05 +/- 0.15) times 10^13 solar luminosity which is recognized as hyper-luminous infrared galaxies (HyLIRGs).
In this presentation, we will also discuss their statistical properties such as density (HSC project #34, Toba et al. 2015 in prep).