Oral Presentation

Gas feeding of SMBHs and remnant SF regions in Swift/BAT selected "IR pure-AGNs"

Author(s): Xiaoyang Chen, Kohei Ichikawa, Michael Koss, Claudio Ricci

Presenter: Xiaoyang Chen (NAOJ)

FIR radiation of active galaxies is typically dominated by the thermal emission of star-formation (SF) dust. Utilizing Swift/BAT AGN Spectroscopic Survey we recently found 20 Seyfert galaxies where the IR radiation is almost fully contributed by the AGN dusty torus even in the FIR band (hereafter "IR-pure AGNs"). The AGN luminosity and SMBH mass of the IR-pure AGNs is within the scatter range of typical BAT AGN sample, indicating that the domination of IR emission is not due to a luminous AGN such as a quasar. The SFR - stellar mass diagram shows that all of the IR-pure AGNs locate under the local SF main sequence, implying that the quenching of SF in the galaxies results in the domination of IR radiation by AGN. Furthermore, the gas consumption of IR-pure AGNs also show different characteristics compared with those in normal Seyfert galaxies. With this study we aim to understand the evolutionary stage of IR-pure AGNs in the co-evolution of SMBHs and their host galaxies.