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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Cosmological constraints on the gas depletion factor in galaxy clusters

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Autor(es):
Holanda, R. F. L. [1, 2] ; Busti, V. C. [3, 4] ; Gonzalez, J. E. [5] ; Andrade-Santos, F. [5] ; Alcaniz, J. S. [6, 7, 8]
Número total de Autores: 5
Afiliação do(s) autor(es):
[1] Univ Fed Sergipe, Dept Fis, BR-49100000 Sao Cristovao, SE - Brazil
[2] Univ Fed Campina Grande, Dept Fis, BR-58429900 Campina Grande, PB - Brazil
[3] Univ Penn, Dept Phys & Astron, Philadelphia, PA 19104 - USA
[4] Univ Sao Paulo, Dept Fis Matemat, BR-05508090 Sao Paulo, SP - Brazil
[5] Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 - USA
[6] McGill Univ, Dept Phys, Montreal, PQ H3A 2T8 - Canada
[7] Observ Nacl, BR-20921400 Rio De Janeiro, RJ - Brazil
[8] Univ Fed Rio Grande do Norte, Dept Fis, BR-59072970 Natal, RN - Brazil
Número total de Afiliações: 8
Tipo de documento: Artigo Científico
Fonte: Journal of Cosmology and Astroparticle Physics; n. 11 DEC 2017.
Citações Web of Science: 1
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
Linha de fomento: 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
Linha de fomento: Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado