Variable eROSITA X-ray sources in SEP

We aim to identify the sources exhibiting the most significant long-term X-ray variability within 3{deg} of the SEP in the first three surveys, and investigate their properties. We determined the variability significance of ~10^4^ sources observed by eROSITA within 3{deg} of the SEP by using thresholds on the Bayesian excess variance (SCATT_LO) and the maximum amplitude deviation (AMPL_SIG).

Sources exhibiting a variability significance above 3{sigma} were subdivided into likely Galactic and extragalactic sources, by using spectral and photometric information of their optical counterparts. We quantified the X-ray normalised excess variances of all variable sources, and also calculated the periodograms of the brightest ones. Out of more than 104 X-ray sources detected by eROSITA within 3{deg} of the SEP, we identified 453 that exhibit significant X-ray variability.