A multisimulation study of relativistic SZ temperature scalings in galaxy clusters and groups

Lee, Elizabeth; Anbajagane, Dhayaa; Singh, Priyanka; Chluba, Jens; Nagai, Daisuke; Kay, Scott T.; Cui, Weiguang; Dolag, Klaus und Yepes, Gustavo (2022): A multisimulation study of relativistic SZ temperature scalings in galaxy clusters and groups. In: Monthly Notices of the Royal Astronomical Society, Bd. 517, Nr. 4: S. 5303-5324

Abstract

The Sunyaev-Zeldovich (SZ) effect is a powerful tool in modern cosmology. With future observations promising ever improving SZ measurements, the relativistic corrections to the SZ signals from galaxy groups and clusters are increasingly relevant. As such, it is important to understand the differences between three temperature measures: (a) the average relativistic SZ (rSZ) temperature, (b) the mass-weighted temperature relevant for the thermal SZ (tSZ) effect, and (c) the X-ray spectroscopic temperature. In this work, we compare these cluster temperatures, as predicted by the BAHAMAS & MACSIS, ILLUSTRISTNG, MAGNETICUM, and THE THREE HUNDRED PROJECT simulations. Despite the wide range of simulation parameters, we find the SZ temperatures are consistent across the simulations. We estimate a similar or equal to 10 per cent level correction from rSZ to clusters with Y similar or equal to 10(-4) Mpc(-2). Our analysis confirms a systematic offset between the three temperature measures;with the rSZ temperature similar or equal to 20 per cent larger than the other measures, and diverging further at higher redshifts. We demonstrate that these measures depart from simple self-similar evolution and explore how they vary with the defined radius of haloes. We investigate how different feedback prescriptions and resolutions affect the observed temperatures, and discover the SZ temperatures are rather insensitive to these details. The agreement between simulations indicates an exciting avenue for observational and theoretical exploration, determining the extent of relativistic SZ corrections. We provide multiple simulation-based fits to the scaling relations for use in future SZ modelling.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Physik
• Themengebiete: 500 Naturwissenschaften und Mathematik > 530 Physik
• ISSN: 0035-8711
• Sprache: Englisch
• DFG: Gefördert durch die Deutsche Forschungsgemeinschaft (DFG) - 390783311