X-ray Selected Galaxy Groups in Bo\"otes
Bruna Vajgel, Christine Jones, Paulo A. A. Lopes, William R. Forman,, Stephen S. Murray, Andrew Goulding, Felipe Andrade-Santos

TL;DR
This paper analyzes X-ray and optical properties of galaxy groups in the Boötes field, revealing a break in the mass-luminosity relation and predicting the number of groups eROSITA will detect, aiding large-scale structure mapping.
Contribution
It presents a detailed analysis of galaxy groups' properties, identifies a break in the X-ray luminosity-mass relation, and forecasts future group detections by eROSITA.
Findings
Break in the $L_X$-$M_{500}$ relation at $~5\times10^{13}$ M$_\odot$
Different power-law slopes for groups and clusters in the mass-luminosity relation
eROSITA will detect approximately 1800 galaxy groups within 200 Mpc
Abstract
We present the X-ray and optical properties of the galaxy groups selected in the Chandra X-Bo\"otes survey. Our final sample comprises 32 systems at \textbf{}, with 14 below . For these 14 systems we estimate velocity dispersions () and perform a virial analysis to obtain the radii ( and ) and total masses ( and ) for groups with at least five galaxy members. We use the Chandra X-ray observations to derive the X-ray luminosity (). We examine the performance of the group properties , and , as proxies for the group mass. Understanding how well these observables measure the total mass is important to estimate how precisely the cluster/group mass function is determined. Exploring the scaling relations built with the X-Bo\"otes sample and comparing these with samples from the literature, we…
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