Papers › The Atacama Cosmology Telescope: Modeling the Gas Thermodynamics in BOSS CMASS...
The Atacama Cosmology Telescope: Modeling the Gas Thermodynamics in BOSS CMASS galaxies from Kinematic and Thermal Sunyaev-Zel'dovich Measurements
Stefania Amodeo, Nicholas Battaglia, Emmanuel Schaan, Simone Ferraro, Emily Moser, Simone Aiola, Jason E. Austermann, James A. Beall, Rachel Bean, Daniel T. Becker, Richard J. Bond, Erminia Calabrese, Victoria Calafut, Steve K. Choi, Edward V. Denison, Mark Devlin, Shannon M. Duff, Adriaan J. Duivenvoorden, Jo Dunkley, Rolando Dünner, Patricio A. Gallardo, Kirsten R. Hall, Dongwon Han, J. Colin Hill, Gene C. Hilton, Matt Hilton, Renée Hložek, Johannes Hubmayr, Kevin M. Huffenberger, John P. Hughes, Brian J. Koopman, Amanda MacInnis, Jeff McMahon, Mathew S. Madhavacheril, Kavilan Moodley, Tony Mroczkowski, Sigurd Naess, Federico Nati, Laura B. Newburgh, Michael D. Niemack, Lyman A. Page, Bruce Partridge, Alessandro Schillaci, Neelima Sehgal, Cristóbal Sifón, David N. Spergel, Suzanne Staggs, Emilie R. Storer, Joel N. Ullom, Leila R. Vale, Alexander van Engelen, Jeff Van Lanen, Eve M. Vavagiakis, Edward J. Wollack, Zhilei Xu
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The thermal and kinematic Sunyaev-Zel'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 galaxies in the Baryon Oscillation Spectroscopic Survey (BOSS) using new measurements of the kSZ and tSZ signals obtained in a companion paper. Combining kSZ and tSZ measurements, we measure within our model the amplitude of energy injection ϵM_⋆ c², where M_⋆ is the stellar mass, to be ϵ=(40±9)×10⁻⁶, and the amplitude of the non-thermal pressure profile to be α_(Nth)<0.2 (2σ), indicating that less than 20% of the total pressure within the virial radius is due to a non-thermal component. We estimate the effects of including baryons in the modeling of weak-lensing galaxy cross-correlation measurements using the best-fit density profile from the kSZ measurement. Our estimate reduces the difference between the original theoretical model and the weak-lensing galaxy cross-correlation measurements in arXiv:1611.08606 by half but does not fully reconcile it. Comparing the tSZ measurements to cosmological simulations, we find that simulations underestimate the CGM pressure at large radii while they fare better in comparison with the kSZ measurements. 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 signal-to-noise kSZ and tSZ observations, upon which future cross-correlation studies will improve.
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