April 16, 2024Open Access
View Full PaperWhat excites the optical emission in X-ray-selected galaxies?
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Abstract
We present a study of 1347 galaxies at z 0.5. In contrast, the positions of the sample members in the BPT diagram exhibit no dependence on the X-ray hardness ratio. Our finding suggests that the X-ray-to-H α ratio can help us to differentiate galaxies whose X-ray flux is dominated by an AGN from galaxies with central X-ray binaries and other stellar X-ray sources.