| Abstract: | WISE has discovered a hyper-luminous, z~2-3 galaxy population, the hot, dust-obscured galaxies or Hot DOGs. Our submilimeter to millimeter follow-up observations using CSO, CARMA, SMA and IRAM reveal that they have much higher dust temperatures than other infrared luminous galaxies at similar redshifts (e.g. submillimeter galaxies (SMGs), dust obscured galaxies (DOGs), and quasars); although their cold dust masses are comparable, the CO gas content is lower for Hot DOGs. Our results also suggest a scenario that Hot DOGs fall in an evolutionary sequence after the SMG and the DOG phases, but before the emerging of a visible quasar, either experiencing a short transitional phase with very high accretion rate, or hosting extraordinary massive black holes, or both. To clarify this degeneracy, we have started a project to measure the masses of their SMBH (via NIR spectroscopy for broad Blamer lines ) using MOSFIRE on Keck and Flamingos2 on Gemini. The preliminary results show that Hot DOGs host SMBHs with masses of ~10^9 Msun, which are greater than typical SMGs or DOGs, but comparable to optical quasars. The derived Eddington ratios are around unity, which are much higher than typical SMG, DOGs or quasars at z~2, but rather closer to quasars found at very high redshifts (z~6).
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