Correlations of near-infrared, optical and X-ray luminosity for early-type galaxies

The relation between X-ray luminosity and near-infrared (NIR) luminosity for early-type galaxies has been examined. NIR luminosities should provide a superior measure of stellar mass compared to optical luminosities used in previous studies, especially if there is significant star formation or dust present in the galaxies. However, we show that the X-ray-NIR relations are remarkably consistent with the X-ray-optical relations. This indicates that the large scatter of the relations is dominated by scatter in the X-ray properties of early-type galaxies, and is consistent with early-types consisting of old, quiescent stellar populations. We have investigated scatter in terms of environment, surface brightness profile, Mg 2 , Hβ, Hy line strength indices, spectroscopic age and nuclear Ha emission. We found that galaxies with high Mg 2 index, low Hβ and Hy indices or a 'core' profile have a large scatter in L X , whereas galaxies with low Mg 2 , high Hβ and Hy indices or 'power-law' profiles generally have L X < 10 41 erg s -1 . There is no clear trend in the scatter with environment or nuclear Ha emission.

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