We have developed a fully Bayesian scheme to statistically
extract the full stellar source content in the eROSITA all-sky survey.
The identification scheme heavily relies on Gaia data, since
all coronal X-ray sources should have a Gaia counterpart with
significant parallax, and assigns to every X-ray source
a probability with which a given X-ray source is stellar. With
our chosen priors the separation between stellar and non-stellar
sources can be performed with quantifiable values for completeness and
reliability. We apply our identification scheme to the eFEDS field, derive the
HR diagram for the stellar eFEDS sources, construct X-ray luminosity
distribution functions and the spatial stratification for the various
stellar types in the Galaxy. The space density of X-ray active giant binary
systems is derived for the first time.
|Presenter status||eROSITA consortium member|