Pressure profiles and mass estimates using high-resolution Sunyaev-Zel'dovich effect observations of Zwicky 3146 with MUSTANG-2

Charles E. Romero; Jonathan Sievers; Vittorio Ghirardini; Simon Dicker; Simona Giacintucci; Tony Mroczkowski; Brian S. Mason; Craig Sarazin; Mark Devlin; Massimo Gaspari; Nicholas Battaglia; Matthew Hilton; Esra Bulbul; Ian Lowe; Sara Stanchfield

doi:10.3847/1538-4357/ab6d70

paper

Pressure profiles and mass estimates using high-resolution Sunyaev-Zel'dovich effect observations of Zwicky 3146 with MUSTANG-2

arXiv:1908.09200 · doi:10.3847/1538-4357/ab6d70

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 $3.8 8_{- 0.58}^{+ 0.62}$ to $22.50 \pm 7.58 \times 1 0^{14}$ M $_{⊙}$ , where ICM-based estimates with reported errors $< 20$ \% suggest that we should expect to find a mass between $6.5 3_{- 0.44}^{+ 0.44} \times 1 0^{14}$ M $_{⊙}$ (from Planck, with an $8.4 σ$ detection) and $8.5 2_{- 1.47}^{+ 1.77} \times 1 0^{14}$ M $_{⊙}$ (from ACT, with a $14 σ$ detection). This broad range of masses is suggestive that there is ample room for improvement for all methods. Here, 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 $104 σ$ . 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 -- where we employ X-ray constraints from \emph{XMM-Newton} on the electron density profile when assuming hydrostatic equilibrium. Depending on the model and estimation method, our $M_{500}$ estimates range from $6.23 \pm 0.59$ to $10.6 \pm 0.95 \times 1 0^{14}$ M $_{⊙}$ , where our estimate from hydrostatic equilibrium, is $8.2 9_{- 1.24}^{+ 1.93}$ ( $\pm 19.1$ \% stat) $_{- 0.68}^{+ 0.74}$ ( $\pm 8.6$ \% sys, calibration) $\times 1 0^{14}$ M $_{⊙}$ . Our fiducial mass, derived from a $Y$ - $M$ relation is $8.1 6_{- 0.54}^{+ 0.44}$ ( $\pm 5.5$ \% stat) $_{- 0.43}^{+ 0.46}$ ( $\pm 5.5$ \% sys, $Y$ - $M$ ) $_{- 0.55}^{+ 0.59}$ ( $\pm 7.0$ \% sys, cal.) $\times 1 0^{14}$ M $_{⊙}$ .

arXiv comment24 pages, 16 figures; submitted to ApJ

Pressure profiles and mass estimates using high-resolution Sunyaev-Zel'dovich effect observations of Zwicky 3146 with MUSTANG-2

Abstract

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