We present the physical properties of mid-IR galaxies/AGN at z < 4 in the 140 deg2
fields observed by SRG/eROSITA using the PV phase program (eFEDS). By cross-matching the
WISE 22 um (W4)-detected sample and the eFEDS X-ray point-source catalog, we find that
693 objects are detected by eROSITA. We have compiled a multi-wavelength dataset
extending from X-ray to far-IR wavelengths. We have also performed (i) an X-ray spectral
analysis, (ii) SED fitting using X-CIGALE, (iii) 2D image-decomposition analysis using
Subaru HSC images, and (iv) optical spectral fitting with QSFit to investigate the AGN
and host galaxy properties. For 7,707 WISE 22 um objects that are undetected by
eROSITA, we have performed an X-ray stacking analysis to examine the typical physical
properties of these X-ray faint and probably obscured objects. We find that (i) 82% of
the eFEDS-W4 sources are classified as X-ray AGN with log LX > 42 erg s-1, (ii) 67% and
24% of the objects have log (LIR/Lsun) > 12 and 13, respectively, and (iii) the
relationship between the Eddington ratio and NH for the eFEDS-W4 sample and a comparison
with a model prediction from a galaxy-merger simulation indicates that approximately
5.0% of the eFEDS-W4 sources in our sample are likely to be in an AGN-feedback phase, in
which strong radiation pressure from the AGN blows out the surrounding material from the
nuclear region (Toba et al. 2021, A&A, 649, L11; 2022, A&A, 661, A15).