Cosmological constraints on the gas depletion factor in galaxy clusters

Autor(es)

Holanda, R. F. L. ; Busti, V. C. ; Gonzalez, J. E. ; Andrade-Santos, F. ; Alcaniz, J. S.

• Tipo de documento: Artigo Científico
• Fonte: Journal of Cosmology and Astroparticle Physics; v. N/A, n. 11, p. 13-pg., 2017-12-01.

Resumo

The evolution of the X-ray emitting gas mass fraction (f(gas)) in massive galaxy clusters can be used as an independent cosmological tool to probe the expansion history of the Universe. Its use, however, depends upon a crucial quantity, i.e., the depletion factor gamma, which corresponds to the ratio by which f(gas) is depleted with respect to the universal baryonic mean. This quantity is not directly observed and hydrodynamical simulations performed in a specific cosmological model (e.g., a flat Lambda CDM cosmology) have been used to calibrate it. In this work, we obtain for the first time self-consistent observational constraints on the gas depletion factor combining 40 X-ray emitting gas mass fraction measurements and luminosity distance measurements from type Ia supernovae. Using Gaussian Processes to reconstruct a possible redshift evolution of gamma, we find no evidence for such evolution, which confirms the current results from hydrodynamical simulations. Moreover, our constraints on gamma can be seen as a data prior for cosmological analyses on different cosmological models. The current measurements are systematic limited, so future improvements will depend heavily on a better mass calibration of galaxy clusters and their measured density profiles. (AU)

• Processo FAPESP: 14/21098-1 - Cosmologia de precisão com o Dark Energy Survey
• Beneficiário: Vinicius Consolini Busti
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 16/17271-5 - Aglomerados de galáxias como sondas cosmológicas: calibração da relação massa-riqueza
• Beneficiário: Vinicius Consolini Busti
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado