Hard X-Ray to Radio Multiwavelength SED Analysis of Local U/LIRGs in the GOALS Sample with a Self-consistent AGN Model including a Polar-dust Component

Abstract We conduct hard X-ray to radio multiwavelength spectral energy distribution (SED) decomposition for 57 local luminous and ultraluminous infrared galaxies observed with the Nuclear Spectroscopic Telescope Array and/or Swift/Burst Alert Telescope in the GOALS sample. We modify the latest SED-...

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Bibliographic Details
Published in:The Astrophysical journal. Supplement series 2023-04, Vol.265 (2), p.37
Main Authors: Yamada, Satoshi, Ueda, Yoshihiro, Herrera-Endoqui, Martín, Toba, Yoshiki, Miyaji, Takamitsu, Ogawa, Shoji, Uematsu, Ryosuke, Tanimoto, Atsushi, Imanishi, Masatoshi, Ricci, Claudio
Format: Article
Language:English
Subjects:
Active galactic nuclei
Astronomy & Astrophysics
Cosmic dust
Dust
Extinction
Galaxies
Galaxy distribution
Growth rate
Infrared astronomy
Infrared galaxies
Infrared photometry
Luminosity
Optical observation
Outflow
Radio astronomy
Radio continuum emission
Spectral energy distribution
Spectroscopic telescopes
Star & galaxy formation
Star formation
Sublimation
Toruses
X-ray active galactic nuclei
X-ray astronomy
X-rays
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Summary:Abstract We conduct hard X-ray to radio multiwavelength spectral energy distribution (SED) decomposition for 57 local luminous and ultraluminous infrared galaxies observed with the Nuclear Spectroscopic Telescope Array and/or Swift/Burst Alert Telescope in the GOALS sample. We modify the latest SED-fitting code X-CIGALE by implementing the infrared (IR) CLUMPY model, allowing us to conduct the multiwavelength study with the X-ray torus model XCLUMPY self-consistently. Adopting the torus parameters obtained by the X-ray fitting, we estimate the properties of the host galaxies, active galactic nucleus (AGN) tori, and polar dust. The star formation rates (SFRs) become larger with merger stage and most of them are above the main sequence. The SFRs are correlated with radio luminosity, indicating starburst emission is dominant in the radio band. 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 of parsec (early mergers) to kiloparsec scales (late mergers), where the polar dust likely comes from expanding (i.e., evolving) dusty outflows. A comparison between the SFRs and intrinsic AGN luminosities suggests that starbursts occur first and AGNs arise later, and overall their growth rates follow the simultaneous coevolution 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.
ISSN:0067-0049
1538-4365
DOI:10.3847/1538-4365/acb349