S22A0085

Ultra-luminous IR galaxies (L_IR > 10¹² L_⊙, ULIRGs) are thought to represent the rapidly growing phase of massive galaxies before quenching of their star formation by powerful AGN-driven outflows. In order to examine the statistical AGN and outflow properties of ULIRGs, we have constructed an AKARI 90 µm flux limited catalog of 1028 ULIRGs at z=0.1∼1.0. Eight ULIRGs in the sample show extremely fast outflows (v_out >∼ 1500 km s⁻¹), which are the most powerful outflows observed among ULIRGs/AGNs at z<1. However, the star formation in the eight ULIRGs are highly intense with SFR of 300–2000 M_⊙ yr⁻¹, comparable to the SFR of high-z ULIRGs. The co-existence of the extremely fast outflows and high SFR is conflicting with the classical AGN feedback scenario. One possibility is that although the AGN-driven wind is powerful, it has not affected the entire star-forming region. In order to understand the interplay between the extreme outflows and starbursts, we propose to map the outflows and star-forming regions in the ULIRGs with IFU observations. The proposed observation is important to constrain the spatial extent of the strong outflows, and to further estimate the timescale and mass-loss rate of the AGN feedback effect.

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