Pressure Profiles and Mass Estimates Using High-resolution Sunyaev–Zel’dovich Effect Observations of Zwicky 3146 with MUSTANG-2
C. Romero, Jonathan Sievers, V. Ghirardini, Simon Dicker, S. Giacintucci, Tony Mroczkowski, Brian Mason, Craig L. Sarazin, Mark J. Devlin, M. Gaspari, Nicholas Battaglia, Matt Hilton, Esra Bülbül, Ian Lowe, Sara Stanchfield
Abstract
Abstract 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 M 500 values range between to (22.50 ± 7.58) × 10 14 M ⊙ , where ICM-based estimates with reported errors <20% suggest that we should expect to find a mass between M ⊙ (from Planck, with an 8.4 σ detection) and M ⊙ (from ACT, with a 14 σ 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 μ K at the center and a cluster detection of 61 σ . 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 M 500 and M 2500 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 M 500 estimates range from 6.13 ± 0.69 to (10.6 ± 2.0) × 10 14 M ⊙ , where our estimate from HE is (±27% stat) (±7.9% sys, calibration) × 10 14 M ⊙ . Our fiducial mass, derived from a Y – M relation is (±7.9% stat) (±5.4% sys, Y – M ) (±6.9% sys, cal.) × 10 14 M ⊙ .