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In this study, we investigate the X-ray properties of WISEJ090924.01+000211.1 (WISEJ0909+0002), an extremely luminous infrared (IR)galaxy (ELIRG) at $z_{\rm spec}$= 1.871 in the eROSITA final equatorial depthsurvey (eFEDS). WISEJ0909+0002 is a WISE 22 $\mu$m source, located in theGAMA-09 field, detected by eROSITA during the performance and verificationphase. The corresponding optical spectrum indicates that this object is atype-1 active galactic nucleus (AGN). Observations from eROSITA combined withChandra and XMM-Newton archival data indicate a very luminous ($L$ (2--10 keV)= ($2.1 \pm 0.2) \times 10^{45}$ erg s$^{-1}$) unobscured AGN with a power-lawphoton index of $\Gamma$ = 1.73$_{-0.15}^{+0.16}$, and an absorption hydrogencolumn density of $\log\,(N_{\rm H}/{\rm cm}^{-2}) < 21.0$. The IR luminositywas estimated to be $L_{\rm IR}$ = (1.79 $\pm$ 0.09) $\times 10^{14}\,L_{\odot}$ from spectral energy distribution modeling based on 22 photometricdata (X-ray to far-IR) with X-CIGALE, which confirmed that WISEJ0909+0002 is anELIRG. A remarkably high $L_{\rm IR}$ despite very low $N_{\rm H}$ wouldindicate that we are witnessing a short-lived phase in which hydrogen gas alongthe line of sight is blown outwards, whereas warm and hot dust heated by AGNsstill exist. As a consequence of eROSITA all-sky survey,$6.8_{-5.6}^{+16}\times 10^2$ such X-ray bright ELIRGs are expected to bediscovered in the entire extragalactic sky ($|b| > 10^\circ$). This canpotentially be the key population to constrain the bright-end of IR luminosityfunctions.

The eROSITA Final Equatorial-Depth Survey (eFEDS): An X-ray bright, extremely luminous infrared galaxy at z = 1.87