Derivation of the Hubble parameter using galaxy clusters

7th Young Researcher Meeting

Kozmanyan, A.^1 ; Bourdin, H.^1 ; De Gasperis, G.^1,2 ; Mazzotta, P.^1,3 ; Vittorio, N.^1,2

Dipartimento di Fisica, Universita di Roma tor Vergata, Via della Ricerca Scientifica 1, Roma

I-00133, Italy^1

Sezione INFN Roma 2, via della Ricerca Scientifica 1, Roma

I-00133, Italy^2

Harvard Smithsonian Centre for Astrophysics, 60 Garden Street, Cambridge

MA

02138, United States^3

关键词: Expansion rate;    Galaxy clusters;    Hubble constant;    Microwave observations;    Sunyaev-Zel'dovich effect;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/841/1/012004/pdf
DOI  :  10.1088/1742-6596/841/1/012004

来源: IOP

【 摘 要 】

In this work we describe a possible way to use X-ray and microwave observations of nearby galaxy clusters to derive the value of the Hubble constant, that parametrises the expansion rate of the Universe. We provide a brief introduction to the Sunyaev-Zel'dovich effect that allows to detect galaxy clusters at microwave frequencies, and the method to combine it with X-ray observables. We emphasize what kind of considerations should be done when applying the method on real data and study the effect of the geometry of the clusters on the final result.