SMGPS cross-matched with eROSITA/ROSAT and GaiaDR3

Recent advances in sensitive, wide-field radio and X-ray surveys have enabled the identification of larger samples of active stars across the Galaxy. We aim to identify and characterise radio and X-ray-emitting stars in the Galactic plane by combining MeerKAT radio data with soft X-ray observations, and to assess their consistency with the canonical Guedel-Benz relation, which states that the thermal coronal emission observed in soft X-rays is correlated with the non-thermal gyrosynchrotron emission detected in the radio.

We cross-matched compact radio sources from the SARAO MeerKAT Galactic Plane Survey with soft X-ray counterparts from the ROSAT All-Sky Survey and the first release of the SRG/eROSITA all-sky survey, the eRASS1. We investigated their radiobrightness temperatures and computed radio and X-ray luminosities to test for consistency with the Guedel-Benz relation. We identify 137 stellar sources with both radio and X-ray detections.