Fig. 2

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Expected X-ray luminosity from the combined high- and low-mass binary population in the 2-10keV range versus the measurements
. We show the detected galaxies (Pbinom ≤3× 10−4 in the eRASS:4 footprint with blue squares. For non-detections, we plot upper limits using the 99th percentile of the X-ray luminosity (blue arrows). Additionally, we highlight the eRASS:4 luminosities of galaxies with available literature X-ray data (see Sect. 2.4; orange circles). These include data from Seth et al. (2008); She et al. (2017); Baldassare et al. (2022); Ohlson et al. (2023). Some of the galaxies are not detected in the eRASS:4 data but have secure measurements from other instruments available in the literature (orange arrows). A more detailed comparison between the eRASS:4 and literature data is presented in Sect. 3.4.
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