Constraining galaxy cluster temperatures and redshifts with eROSITA survey data

Understand

The nature of dark energy is imprinted in the large-scale structure of the Universe and thus in the mass and redshift distribution of galaxy clusters.

• The upcoming eROSITA mission will exploit this method of probing dark energy by detecting roughly 100,000 clusters of galaxies in X-rays.
• For a precise cosmological analysis the various galaxy cluster properties need to be measured with high precision and accuracy.
• To predict these characteristics of eROSITA galaxy clusters and to optimise optical follow-up observations, we estimate the precision and the accuracy with which eROSITA will be able to determine galaxy cluster temperatures and redshifts from X-ray spectra.