AMiBA: Sunyaev-Zel'dovich effect derived properties and scaling relations of massive galaxy clusters

TL;DR

This paper derives properties and scaling relations of massive galaxy clusters using Sunyaev-Zel'dovich Effect observations from the AMiBA array, demonstrating the potential and limitations of SZE-only measurements.

Contribution

It introduces an iterative method based on isothermal and universal temperature profile models to derive cluster properties solely from SZE data, highlighting biases and agreement with other observations.

Findings

Derived cluster properties (electron temperature, mass, gas mass, Y) from SZE data.

Found good agreement with properties from other observational methods.

Identified biases in scaling relations due to assumptions in the SZE-only approach.

Abstract

The Sunyaev-Zel'dovich Effect (SZE) has been observed toward six massive galaxy clusters, at redshifts 0.091 \leq z \leq 0.322 in the 86-102 GHz band with the Y. T. Lee Array for Microwave Background Anisotropy (AMiBA). We modify an iterative method, based on the isothermal \beta-models, to derive the electron temperature T_e, total mass M_t, gas mass M_g, and integrated Compton Y within r_2500, from the AMiBA SZE data. Non-isothermal universal temperature profile (UTP) \beta models are also considered in this paper. These results are in good agreement with those deduced from other observations. We also investigate the embedded scaling relations, due to the assumptions that have been made in the method we adopted, between these purely SZE-deduced T_e, M_t, M_g and Y. Our results suggest that cluster properties may be measurable with SZE observations alone. However, the assumptions built into the pure-SZE method bias the results of scaling relation estimations and need further study.