Cosmography with the Sunyaev-Zeldovich effect and X-ray data

TL;DR

This paper explores how current and future galaxy cluster observations via the Sunyaev-Zeldovich effect and X-ray data can improve the measurement of the universe's expansion history in a model-independent way, using simulations.

Contribution

It assesses the potential of galaxy cluster data to constrain cosmographic parameters and examines the impact of cluster morphology on these measurements.

Findings

Upcoming data can significantly improve cosmographic parameter constraints.

Galaxy cluster morphology influences the $H_0- q_0$ parameter space.

Monte Carlo simulations demonstrate the potential for future measurements to refine cosmography.

Abstract

Cosmography provides a direct method to map the expansion history of the Universe in a model-independent way. Recently, different kinds of observations have been used in cosmographic analyses, such as SNe Ia and gamma ray bursts measurements, weak and strong lensing, cosmic microwave background anisotropies, etc. In this work we examine the prospects for constraining cosmographic parameters from current and future measurements of galaxy clusters distances based on their Sunyaev-Zeldovich effect (SZE) and X-ray observations. By assuming the current observational error distribution, we perform Monte Carlo simulations based on a well-behaved parameterization for the deceleration parameter to generate samples with different characteristics and study the improvement on the determination of the cosmographic parameters from upcoming data. The influence of galaxy clusters (GC) morphologies on the $H_0- q_0$ plane is also investigated.