Galaxy cluster aperture masses are more robust to baryonic effects than 3D halo masses

ABSTRACT Systematic uncertainties in the mass measurement of galaxy clusters limit cosmological constraining power future surveys that will detect more than 105 clusters. Previously, we argued aperture masses can be inferred accurately and precisely 3D without loss power. Here, use Baryons Haloes Massive Systems (BAHAMAS) cosmological, hydrodynamical simulations to show are also less sensitive changes caused by formation processes. For haloes with $m_\mathrm{200m,dmo} \gt 10^{14} \, h^{-1} \mathrm{M_\odot }$, binned their halo mass, baryonic physics affects similarly when measured within apertures similar virial radius, reaching a maximum reduction $\approx 3 \mathrm{per\, cent}$. lower haloes, $10^{13.5} \lt m_\mathrm{200m,dmo} / }\lt 10^{14}$, sizes $\sim 1 \mathrm{cMpc}$, representative weak lensing observations, is consistently reduced ($\lesssim 5 cent}$) 10 cent}$ for m200m). The evolves only slightly, up 2 $\mathrm{per\, centage}$ points, between redshift 0.25 both m200m. Varying simulated feedback strength so mean hot gas fraction covers observed scatter from X-ray find biased $2 \,$$\mathrm{per\, points at = }$. Therefore, calibrations provide fruitful path reduce sensitivity cluster systematic uncertainties.