Understanding the relation between thermal Sunyaev–Zeldovich decrement and halo mass using the simba and TNG simulations

Author:

Yang Tianyi1ORCID,Cai Yan-Chuan1,Cui Weiguang12ORCID,Davé Romeel134ORCID,Peacock John A1ORCID,Sorini Daniele1ORCID

Affiliation:

1. Institute for Astronomy, University of Edinburgh, Royal Observatory , Blackford Hill, Edinburgh EH9 3HJ, UK

2. Departamento de Física Teórica and CIAFF, Modulo 8 Universidad Autónoma de Madrid , E-28049 Madrid, Spain

3. Department of Physics, University of the Western Cape , Bellville, Cape Town 7535, South Africa

4. South African Astronomical Observatories , Observatory, Cape Town 7925, South Africa

Abstract

ABSTRACT The relation between the integrated thermal Sunyaev–Zeldovich (tSZ) y-decrement versus halo mass (Y–M) can potentially constrain galaxy formation models, if theoretical and observational systematics can be properly assessed. We investigate the Y–M relation in the simba and IllustrisTNG-100 cosmological hydrodynamic simulations, quantifying the effects of feedback, line-of-sight projection, and beam convolution. We find that simba’s active galactic nucleus (AGN) jet feedback generates strong deviations from self-similar expectations for the Y–M relation, especially at $M_{\rm 500}\lesssim10^{13}M_\odot$. In simba, this is driven by suppressed in-halo y contributions owing to lowered halo baryon fractions. IllustrisTNG results more closely resemble simba without jets. Projections of line-of-sight structures weaken these model differences slightly, but they remain significant – particularly at group and lower halo masses. In contrast, beam smearing at Planck resolution makes the models indistinguishable, and both models appear to agree well with Planck data down to the lowest masses probed. We show that the arcminute resolution expected from forthcoming facilities would retain the differences between model predictions, and thereby provide strong constraints on AGN feedback.

Funder

European Research Council

STFC

Royal Society

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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