The identification of super-massive black holes at high redshifts (z>5) raises the question of their physical origin and constrains the accretion history in the early universe. Most of luminous QSOs at these redshifts have been found using optical/NIR drop-out selection methods, with relatively few having been followed-up with X-ray telescopes so far. Direct X-ray searches have not yet significantly improved on the number counts. The eROSITA all-sky survey will allow us to probe the X-ray bright end of the high-redshift AGN population. As a pilot project, we have searched for high-redshift objects in the Legacy DR8 counterparts to eROSITA point-like sources in the eFEDS CalPV survey. We report here the blind X-ray detection of SDSS J083643.86+005453.2, a well known QSO, spectroscopically confirmed at redshift z=5.81. The significance of this detection will be discussed in light of predictions derived from extrapolations of the X-ray luminosity function and the eROSITA sensitivity in this field. The work presented here offers a first glimpse of the high-redshift universe as seen by eROSITA.
|Presenter status||eROSITA consortium member|