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Title: Constraints on the optical depth of galaxy groups and clusters

Journal Article · · The Astrophysical Journal (Online)
 [1]; ORCiD logo [2]; ORCiD logo [3]
  1. Argonne National Lab. (ANL), Lemont, IL (United States); The Univ. of Chicago, Chicago, IL (United States)
  2. Yale Univ., New Haven, CT (United States)
  3. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Here, future data from galaxy redshift surveys, combined with high-resolutions maps of the cosmic microwave background, will enable measurements of the pairwise kinematic Sunyaev–Zel'dovich (kSZ) signal with unprecedented statistical significance. This signal probes the matter-velocity correlation function, scaled by the average optical depth (τ) of the galaxy groups and clusters in the sample, and is thus of fundamental importance for cosmology. However, in order to translate pairwise kSZ measurements into cosmological constraints, external constraints on τ are necessary. In this work, we present a new model for the intracluster medium, which takes into account star formation, feedback, non-thermal pressure, and gas cooling. Our semi-analytic model is computationally efficient and can reproduce results of recent hydrodynamical simulations of galaxy cluster formation. We calibrate the free parameters in the model using recent X-ray measurements of gas density profiles of clusters, and gas masses of groups and clusters. Our observationally calibrated model predicts the average $${\tau }_{500}$$ (i.e., the integrated τ within a disk of size R 500) to better than 6% modeling uncertainty (at 95% confidence level). If the remaining uncertainties associated with other astrophysical uncertainties and X-ray selection effects can be better understood, our model for the optical depth should break the degeneracy between optical depth and cluster velocity in the analysis of future pairwise kSZ measurements and improve cosmological constraints with the combination of upcoming galaxy and CMB surveys, including the nature of dark energy, modified gravity, and neutrino mass.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
National Science Foundation (NSF); National Aeronautics and Space Administration (NASA); USDOE Office of Science (SC), National Energy Research Scientific Computing Center (NERSC)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1366482
Journal Information:
The Astrophysical Journal (Online), Vol. 837, Issue 2; ISSN 1538-4357
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 26 works
Citation information provided by
Web of Science

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Cited By (10)

Measuring galaxy cluster masses with CMB lensing using a Maximum Likelihood estimator: statistical and systematic error budgets for future experiments journal August 2017
Future constraints on halo thermodynamics from combined Sunyaev-Zel'dovich measurements journal November 2017
A one-dimensional hydrodynamic model for accretion, cooling, and heating of gas in dark matter haloes from z  = 6 to z  = 0 journal February 2019
Intrinsic alignment statistics of density and velocity fields at large scales: Formulation, modeling, and baryon acoustic oscillation features journal November 2019
Imaging the Thermal and Kinematic Sunyaev–Zel’dovich Effect Signals in a Sample of 10 Massive Galaxy Clusters: Constraints on Internal Velocity Structures and Bulk Velocities journal July 2019
The X-Ray Halo Scaling Relations of Supermassive Black Holes journal October 2019
Future constraints on halo thermodynamics from combined Sunyaev-Zel'dovich measurements text January 2017
Measuring galaxy cluster masses with CMB lensing using a Maximum Likelihood estimator: Statistical and systematic error budgets for future experiments text January 2017
"SZ spectroscopy" in the coming decade: Galaxy cluster cosmology and astrophysics in the submillimeter preprint January 2019
Fast Radio Burst Tomography of the Unseen Universe preprint January 2019

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