eROSITA mission will soon produce an unprecedented number of galaxy clusters, which in turn should help improve X-ray based cosmological measurements. However, in order to use the eROSITA data for precision cosmology, we must improve our understanding of the physics of X-ray emitting intracluster medium (ICM) and develop techniques to control associated systematic uncertainties in cluster mass...
Constraints on cosmology from cluster number count strongly depend on the accuracy of cluster masses which are sensitive to the dynamical state of clusters, thus it is of importance to be able to measure accurately the dynamical state of each cluster. eROSITA telescope on board of Spectrum-Roentgen-Gamma (SRG) mission was launched in July 2019. eROSITA's large effective area, good spatial...
X-ray surveys such as those conducted by eROSITA are a powerful way to identify large
numbers of galaxy clusters. But cluster candidates identified by eROSITA need additional confirmation and redshifts to provide a clean cluster catalog that can be used for science.
Modern optical imaging surveys such as HSC, DES and the Legacy Survey cover large fractions of the eROSITA extragalactic sky and...
Accurate and precise mass measurements of clusters of galaxies are critical for constraining cosmology with cluster number counts from eROSITA. Much progress has been made in measuring cluster masses from X-rays (assuming hydrostatic equilibrium), weak gravitational lensing, and galaxy dynamics, but systematic differences between the methods still remain at the tens of percent level. We will...
The IllustrisTNG simulations produce an unprecedented sample of thousands of well-resolved galaxies within halos of total mass above 10^13 solar masses. TNG is a series of gravo-magnetohydrodynamical cosmological volumes which enable us to simultaneously resolve the internal structure of galaxies at ~hundred parsec scales, while also capturing the full diversity of entire galaxy populations....
I will give an overview of Sunyaev-Zel'dovich (SZ) cluster surveys, the resultant cosmological constraints, and projected future results. Since the first SZ-discovered cluster in 2008, there are now over 1500 SZ-selected clusters reported in the literature. Ongoing surveys from AdvACT and SPT-3G promise to deliver samples with several thousand additional clusters in the next few years, with...
The recent combination of deep Sunyaev Zel'dovich (SZ) surveys with pointed X-ray follow-up has enabled the study of the intracluster medium across most of cosmic time. In particular, within the South Pole Telescope (SPT) collaboration, we have been utilizing Chandra and XMM-Newton follow-up of SPT-selected clusters to study the evolution of the dynamical state, the cooling/heating balance,...
The properties of the hot medium at the periphery of galaxy clusters and in filaments connecting cosmic structures carries crucial information on their accretion history and on the feedback and enrichment processes from galaxies. In order to study the details of these processes and the three-dimensional structure of the diffuse baryons in clusters and cosmic filaments we resort to large...
Although they are the building blocks of rocky planets and even life, the major fraction of metals in the Universe is found outside galaxies, within a hot, ionized intergalactic phase. When this plasma is hot and dense enough to glow in X-rays (i.e. pervading galaxy clusters, groups, and surrounding isolated elliptical galaxies), the abundance of key chemical elements can be measured via...
Mergers between galaxy clusters are the most energetic phenomena in the Universe. During these cosmic collisions, turbulence and shocks are generated into the ICM where they are believed to power Mpc-scale diffuse synchrotron sources in form of radio halos and radio relics. Nowadays, studies on non-thermal phenomena in merging galaxy clusters have been limited to a few tens of massive systems...
Abell 3266 is a fascinating merging galaxy cluster system, showing a great deal of substructure. There is a plume of low entropy gas running from the core of the cluster, which may be material stripped from a subcluster (Sauvageot et al. 2005; Finoguenov et al. 2005). eROSITA observed A3266 as a calibration target. The wide field of eROSITA and uniform coverage provide an excellent opportunity...
