X-ray counterparts to stellar MeerKAT Galactic-plane compact radio sources
O. D. Egbo, P. J. Groot, D. A. H. Buckley, J. Robrade, A. D. Schwope, S. Freund, P. C. Schneider, B. Stelzer

TL;DR
This study combines MeerKAT radio data with X-ray surveys to identify and analyze active stars in the Galactic plane, testing their emission properties against the G"udel-Benz relation and revealing deviations from expected correlations.
Contribution
It provides the first large sample of radio and X-ray detected stars in the Galactic plane, characterizes their emission mechanisms, and challenges the universality of the G"udel-Benz relation.
Findings
137 stars detected in both radio and X-ray.
Most stars are consistent with gyrosynchrotron emission.
Sample lies below the canonical G"udel-Benz relation.
Abstract
Radio emission from magnetically active stars arises mainly from non-thermal processes and complements high-energy X-ray emission. Sensitive, wide-field radio and X-ray surveys now allow 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 assess their consistency with the canonical G\"udel-Benz relation, which links thermal coronal X-rays to non-thermal gyrosynchrotron radio emission. We cross-matched compact sources from the SARAO MeerKAT Galactic Plane Survey with counterparts from the ROSAT All-Sky Survey and the first release of SRG/eROSITA (eRASS1). We computed radio-brightness temperatures and radio-X-ray luminosities to test the relation. We identify 137 stars with both radio and X-ray detections. Their …
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Taxonomy
TopicsAstrophysical Phenomena and Observations · Astronomy and Astrophysical Research · Stellar, planetary, and galactic studies
