Fig. 6.

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Correlation of GaiaG-band magnitudes of sources with their X-ray fluxes measured in units of mW/m2. All SRG/eFEDS Galactic objects are represented as blue circles, the majority of which fall below the detection threshold of the ROSAT All Sky X-ray survey, which is indicated by the solid black line. The dashed and dotted black lines represent the X-ray-to-optical flux ratios of 0.5 and 0.025. The newly identified polar ZTF J0112+5827 is denoted by the red asterisk. Previously known polars Abril et al. (2020), Inight et al. (2023), Rodriguez et al. (2023) are shown as orange dots. All confirmed polars exhibit characteristically high X-ray-to-optical flux ratios, with most sources having (FX/Fopt) > 0.025, and a significant fraction exceeding (FX/Fopt) > 0.5.
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