Oral Presentation

Hard X-ray to Radio Multiwavelength SED Analysis of Local U/LIRGs with Self-consistent AGN Model Including Polar-dust Component

Author(s): Satoshi Yamada (RIKEN), Yoshihiro Ueda (Kyoto U.), Martin Herrera-Endoqui (UNAM), Yoshiki Toba (NAOJ), Takamitsu Miyaji (UNAM), Shoji Ogawa, Ryosuke Uematsu (Kyoto U.), Atsushi Tanimoto (Kagoshima U.), Masatoshi Imanishi (NAOJ), Claudio Ricci (DPU)

Presenter: Satoshi Yamada (RIKEN)

We conduct a hard X-ray to radio multiwavelength spectral energy distribution (SED) decomposition for 57 local ultra-/luminous infrared galaxies (U/LIRGs) observed with NuSTAR and/or Swift/BAT in GOALS (Armus+09) sample. We modify the latest SED-fitting code X-CIGALE by implementing the infrared (IR) CLUMPY model, allowing the multiwavelength study with the X-ray torus model (XCLUMPY) self-consistently. Adopting the torus parameters obtained by the X-ray fitting (Yamada+21, ApJS, 257, 61), we mainly report the results of the active galactic nucleus (AGN) torus and polar dust in this presentation. Although polar-dust extinction is much smaller than torus extinction, the UV-to-IR (mainly IR) polar dust luminosities are 〜2 times larger than the torus ones. The polar-dust temperature decreases while the physical size, estimated by the temperature and dust sublimation radius, increases with AGN luminosity from a few tens parsec (early mergers) to kiloparsec scales (late mergers), where the polar dust is likely the expanding dusty outflows. By comparing the SFRs with intrinsic AGN luminosities, we also find that the starbursts occur first and AGNs arise later, and overall their growth rates follow the simultaneous coevolution relation that can establish the local galaxy-SMBH mass relation. We confirm the coexistence of intense starbursts, AGNs, and large-scale outflows in late mergers, supporting a standard AGN feedback scenario (Yamada+23, ApJS, accepted).