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We perform a systematic X-ray spectroscopic analysis of 57 localultra/luminous infrared galaxy systems (containing 84 individual galaxies)observed with Nuclear Spectroscopic Telescope Array and/or Swift/BAT. Combiningsoft X-ray data obtained with Chandra, XMM-Newton, Suzaku and/or Swift/XRT, weidentify 40 hard ($>$10 keV) X-ray detected active galactic nuclei (AGNs) andconstrain their torus parameters with the X-ray clumpy torus model XCLUMPY(Tanimoto et al. 2019). Among the AGNs at $z < 0.03$, for which sample biasesare minimized, the fraction of Compton-thick ($N_{\rm H} \geq 10^{24}$cm$^{-2}$) AGNs reaches 64$^{+14}_{-15}$% (6/9 sources) in late mergers, while24$^{+12}_{-10}$% (3/14 sources) in early mergers, consistent with the tendencyreported by Ricci et al. (2017). We find that the bolometric AGN luminositiesderived from the infrared data increase, but the X-ray to bolometric luminosityratios decrease, with merger stage. The X-ray weak AGNs in late mergersubiquitously show massive outflows at sub-pc to kpc scales. Among them, themost luminous AGNs ($L_{\rm bol,AGN} \sim 10^{46}$ erg s$^{-1}$) haverelatively small column densities of $\lesssim$10$^{23}$ cm$^{-2}$ and almostsuper-Eddington ratios ($\lambda_{\rm Edd} \sim$ 1.0). Their torus coveringfactors ($C_{\rm T}^{\rm (22)} \sim 0.6$) are larger than those of Swift/BATselected AGNs with similarly high Eddington ratios. These results suggest ascenario that, in the final stage of mergers, multiphase strong outflows areproduced due to chaotic quasi-spherical inflows and the AGN becomes extremelyX-ray weak and deeply buried due to obscuration by inflowing and/or outflowingmaterial.

the astrophysical journal. supplement series/astrophysical journal. supplement series

Comprehensive Broadband X-ray and Multiwavelength Study of Active  Galactic Nuclei in Local 57 Ultra/luminous Infrared Galaxies Observed with  NuSTAR and/or Swift/BAT