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The cosmological constraining power of modern galaxy cluster catalogs can beimproved by obtaining low-scatter mass proxy measurements for even a smallfraction of sources. In the context of large upcoming surveys that will revealthe cluster population down to the group scale and out to high redshifts,efficient strategies for obtaining such mass proxies will be valuable. In thiswork, we use high-quality weak lensing and X-ray mass estimates for massiveclusters in current X-ray selected catalogs to revisit the scaling relations ofthe projected, center-excised X-ray luminosity ($L_{ce}$), which previous worksuggests correlates tightly with total mass. Our data confirm that this is thecase, with $L_{ce}$ having an intrinsic scatter at fixed mass comparable tothat of gas mass, temperature or $Y_X$. Compared to these other proxies,however, $L_{ce}$ is less susceptible to systematic uncertainties due tobackground modeling, and can be measured precisely with shorter exposures. Thisopens up the possibility of using $L_{ce}$ to estimate masses for large numbersof clusters discovered by new X-ray surveys (e.g. eROSITA) directly from thesurvey data, as well as for clusters discovered at other wavelengths, withrelatively short follow-up observations. We describe a simple procedure formaking such estimates from X-ray surface brightness data, and comment on thespatial resolution required to apply this method as a function of cluster massand redshift. We also explore the potential impact of Chandra and XMM-Newtonfollow-up observations over the next decade on dark energy constraints from newcluster surveys.

Center-Excised X-ray Luminosity as an Efficient Mass Proxy for Future Galaxy Cluster Surveys