Atacama Cosmology Telescope: Modeling the gas thermodynamics in BOSS CMASS galaxies from kinematic and thermal SunyaevZel'dovich measurements
Abstract
The thermal and kinematic SunyaevZel'dovich effects (tSZ, kSZ) probe the thermodynamic properties of the circumgalactic and intracluster medium (CGM and ICM) of galaxies, groups, and clusters, since they are proportional, respectively, to the integrated electron pressure and momentum along the line of sight. We present constraints on the gas thermodynamics of CMASS (constant stellar mass) galaxies in the Baryon Oscillation Spectroscopic Survey using new measurements of the kSZ and tSZ signals obtained in a companion paper [Schaan et al.]. Combining kSZ and tSZ measurements, we measure within our model the amplitude of energy injection ε M_{⋆}c^{2}, where M_{⋆} is the stellar mass, to be ε =(40 ±9 )×10^{6}, and the amplitude of the nonthermal pressure profile to be α_{Nth}<0.2 (2 σ ), indicating that less than 20% of the total pressure within the virial radius is due to a nonthermal component. We estimate the effects of including baryons in the modeling of weaklensing galaxy crosscorrelation measurements using the bestfit density profile from the kSZ measurement. Our estimate reduces the difference between the original theoretical model and the weaklensing galaxy crosscorrelation measurements in [A. Leauthaud et al., Mon. Not. R. Astron. Soc. 467, 3024 (2017), 10.1093/mnras/stx258] by half (50% at most), but does not fully reconcile it. Comparing the kSZ and tSZ measurements to cosmological simulations, we find that they underpredict the CGM pressure and to a lesser extent the CGM density at larger radii with probabilities to exceed ranging from 0.00 to 0.03 and 0.12 to 0.14, for tSZ and kSZ, respectively. This suggests that the energy injected via feedback models in the simulations that we compared against does not sufficiently heat the gas at these radii. We do not find significant disagreement at smaller radii. These measurements provide novel tests of current and future simulations. This work demonstrates the power of joint, high signaltonoise kSZ and tSZ observations, upon which future crosscorrelation studies will improve.
 Publication:

Physical Review D
 Pub Date:
 March 2021
 DOI:
 10.1103/PhysRevD.103.063514
 arXiv:
 arXiv:2009.05558
 Bibcode:
 2021PhRvD.103f3514A
 Keywords:

 Astrophysics  Cosmology and Nongalactic Astrophysics;
 Astrophysics  Astrophysics of Galaxies
 EPrint:
 Corrected error in the algorithm that calculates the kSZ temperature profile for a given GNFW density model. The value of $\log_{\rm10} \rho_0$ changed by 0.75$\sigma$ in Tab.II and Fig.2, and affected the results in the left panels of Fig. 6. Conclusions are unchanged. Erratum published at https://link.aps.org/doi/10.1103/PhysRevD.107.049903