Statistics of thermal gas pressure as a probe of cosmology and galaxy formation

Chen, Ziyang; Jamieson, Drew; Komatsu, Eiichiro; Bose, Sownak; Dolag, Klaus; Hadzhiyska, Boryana; Hernández-Aguayo, César; Hernquist, Lars; Kannan, Rahul; Pakmor, Rüdiger; Springel, Volker

Abstract

The statistics of thermal gas pressure are a new and promising probe of cosmology and astrophysics. The large-scale cross-correlation between galaxies and the thermal Sunyaev-Zeldovich effect gives the bias-weighted mean electron pressure, hbhPei. In this paper, we show that hbhPei is sensitive to the amplitude of fluctuations in matter density, for example hbhPei ∝ ðσ8Ω0.81 m h0.67Þ3.14 at redshift z ¼ 0. We find that at z < 0.5 the observed hbhPei is smaller than that predicted by the state-of-the-art hydrodynamical simulations of galaxy formation, MillenniumTNG, by a factor of 0.93. This can be explained by a lower value of σ8 and Ωm, similar to the so-called “S8 tension” seen in the gravitational lensing effect, although the influence of astrophysics cannot be completely excluded. The difference between Magneticum and MillenniumTNG at z < 2 is small, indicating that the difference in the galaxy formation models used by these simulations has little impact on hbhPei at this redshift range. At higher z, we find that both simulations are in a modest tension with the existing upper bounds on hbhPei. We also find a significant difference between these simulations there, which we attribute to a larger sensitivity to the galaxy formation models in the high redshift regime. Therefore, more precise measurements of hbhPei at all redshifts will provide a new test of our understanding of cosmology and galaxy formation.

Citation

Chen, Z., Jamieson, D., Komatsu, E., Bose, S., Dolag, K., Hadzhiyska, B., …Springel, V. (2024). Statistics of thermal gas pressure as a probe of cosmology and galaxy formation. Physical Review D, 109(6), Article 063513. https://doi.org/10.1103/physrevd.109.063513

• Journal Article Type: Article
• Acceptance Date: Feb 2, 2024
• Online Publication Date: Mar 8, 2024
• Publication Date: Mar 8, 2024
• Deposit Date: May 16, 2024
• Publicly Available Date: May 16, 2024
• Journal: Physical Review D
• Print ISSN: 2470-0010
• Electronic ISSN: 2470-0029
• Publisher: American Physical Society
• Peer Reviewed: Peer Reviewed
• Volume: 109
• Issue: 6
• Article Number: 063513
• DOI: https://doi.org/10.1103/physrevd.109.063513
• Public URL: https://durham-repository.worktribe.com/output/2442642