Pressure Profiles and Mass Estimates Using High-resolution Sunyaev-Zel'dovich Effect Observations of Zwicky 3146 with MUSTANG-2

The galaxy cluster Zwicky 3146 is a sloshing cool core cluster at z = 0.291 that in X-ray imaging does not appear to exhibit significant pressure substructure in the intracluster medium (ICM). The published M₅₀₀ values range between 3.88_-0.58^+0.62 to (22.50 ± 7.58) × 10¹⁴ M_⊙, where ICM-based estimates with reported errors <20% suggest that we should expect to find a mass between 6.53_-0.44^+0.44 × 10¹⁴ M_⊙ (from Planck, with an 8.4σ detection) and 8.52_-1.47^+1.77 × 10¹⁴ M_⊙ (from ACT, with a 14σ detection). We investigate the ability to estimate the mass of Zwicky 3146 via the Sunyaev-Zel'dovich (SZ) effect with data taken at 90 GHz by MUSTANG-2 to a noise level better than 15 μK at the center and a cluster detection of 61σ. We derive a pressure profile from our SZ data, which is in excellent agreement with that derived from X-ray data. From our SZ-derived pressure profiles, we infer M₅₀₀ and M₂₅₀₀ via three methods - Y-M scaling relations, the virial theorem, and hydrostatic equilibrium (HE) - where we employ X-ray constraints from XMM-Newton on the electron density profile when assuming HE. Depending on the model and estimation method, our M₅₀₀ estimates range from 6.13 ± 0.69 to (10.6 ± 2.0) × 10¹⁴ M_⊙, where our estimate from HE is 7.69_-1.98^+2.19 (±27% stat)_-0.59^+0.63 (±7.9% sys, calibration) × 10¹⁴ M_⊙. Our fiducial mass, derived from a Y-M relation is 8.06_-0.61^+0.67 (±7.9% stat)_-0.42^+0.45 (±5.4% sys, Y-M)_-0.54^+0.58 (±6.9% sys, cal.) × 10¹⁴ M_⊙.