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We discuss the potential of the eROSITA telescope on board theSpectrum-Roentgen-Gamma (SRG) observatory to detect stellar tidal disruptionevents (TDE) during its 4-year all-sky survey. These events are expected toreveal themselves as luminous flares of UV/soft X-ray emission associated withthe centres of previously non-active galaxies and fading by few orders ofmagnitude on time-scales of several months to years. Given that eROSITA willcomplete an all-sky survey every 6 months and a total of 8 such scans will beperformed over the course of the mission, we propose to distinguish TDEs fromother X-ray transients using two criteria: I) large (more than a factor of 10)X-ray variation between two subsequent 6-month scans and ii) soft X-rayspectrum. The expected number of TDE candidates is $\sim 10^3$ per scan (withmost of the events being new discoveries in a given scan), so that a total ofseveral thousand TDE candidates could be found during the 4-year survey. Theactual number may significantly differ from this estimate, since it is based onjust a few TDEs observed so far. The eROSITA all-sky survey is expected to benearly equally sensitive to TDEs occurring near supermassive black holes (SMBH)of mass between $\sim 10^6$ and $\sim 10^7 M_\odot$ and will thus provide aunique census of quiescent SMBHs and associated nuclear stellar cusps in thelocal Universe ($z\lesssim 0.15$). Information on TDE candidates will beavailable within a day after their detection and localization by eROSITA,making possible follow-up observations that may reveal peculiar types of TDEs.

SRG/eROSITA prospects for the detection of stellar tidal disruption flares