eROSITA Final Equatorial-Depth Survey (eFEDS): eFEDS X-ray view of WERGS Radio Galaxies selected by the Subaru/HSC and VLA/FIRST survey

Abstract

We construct the eROSITA X-ray catalog of radio galaxies discovered by the WERGS survey that is made by the cross-matching of the wide-area Subaru/HSC optical survey and VLA/FIRST 1.4 GHz radio survey. We find 393 eROSITA detected radio galaxies in the 0.5--2 keV band in the eFEDS field covering 140~deg${}^2$. Thanks to the wide and medium depth eFEDS X-ray survey, the sample contains the rare and most X-ray luminous radio galaxies above the knee of the X-ray luminosity function, spanning 44<log L(0.5-2keV,abs)<46.5 at $1<z<4$. Based on the X-ray properties obtained by the spectral fitting, 37 sources show obscured AGN signature with $\log (N_{\mathrm{H}}/{\mathrm{cm}}^{-2})>22$. Those obscured and radio AGN reside in $0.4<z<3.2$, indicating that they are obscured counterparts of the radio-loud quasar, which are missed in the previous optical quasar surveys. By combining radio and X-ray luminosities, the jet production efficiency ${\eta }_{\mathrm{jet}}$ is investigated, and we find 14 sources with extremely high jet production efficiency at ${\eta }_{\mathrm{jet}}\approx 1$. This high ${\eta }_{\mathrm{jet}}$ value might be a result of 1) the decreased radiation efficiency of ${\eta }_{\mathrm{rad}}<0.1$ due to the low accretion rate for those sources and/or 2) the boosting due to the decline of $L_{\mathrm{bol}}$ by a factor of 10--100 by keeping $P_{\mathrm{jet}}$ constant in the previous Myr, indicating the experience of the AGN feedback. Finally, inferring the BH masses from the stellar-mass, we find that X-ray luminous sources show the excess of the radio emission with respect to the value estimated from the fundamental plane. Such radio emission excess cannot be explained by the Doppler booming alone, and therefore disk-jet connection of X-ray luminous eFEDS-WERGS is fundamentally different from the conventional fundamental plane which mainly covers low accretion regime.

20 pages, 11 figures, accepted for publication in A&A

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