The growth rate of cosmic structures in the local Universe with the ALFALFA survey

Autor(es)

Avila, F. ^[1] ; Bernui, A. ^[1] ; de Carvalho, E. ^[2] ; Novaes, C. P. ^[3]

Afiliação do(s) autor(es)

^[1] Observatorio Nacl, Rua Gen Jose Cristino 77, BR-20921400 Rio De Janeiro, RJ - Brazil

^[2] Univ Estado Amazonas, Ctr Estudos Super Tabatinga, BR-69640000 Abatinga, AM - Brazil

^[3] Inst Nacl Pesquisas Espaciais, Av Aslronautas 1758, Sao Jose Dos Campos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Monthly Notices of the Royal Astronomical Society; v. 505, n. 3, p. 3404-3413, AUG 2021.
• Citações Web of Science: 0

Resumo

We investigate the growth rate of structures in the local Universe. For this, we use as a cosmological tracer the HI line extra-galactic sources from the Arecibo Legacy Fast ALFA (ALFALFA) survey to obtain a measurement of the normalized growth rate parameter, f sigma(8), considered a powerful tool to constrain alternative models of gravity. For these analyses, we calculate the Local Group velocity due to the matter structures distribution in the ALFALFA catalogue and compare it with the Local Group velocity relative to the Cosmic Microwave Background frame to obtain the velocity scale parameter, beta. Using Monte Carlo realizations and lognormal simulations, our methodology quantifies the errors introduced by shot-noise and partial sky coverage of the analysed data. The measurement of the velocity scale parameter beta and the calculation of the matter fluctuation of the cosmological tracer, sigma(tr)(8) , lead us to f sigma(8) = 0.46 +/- 0.06 at (z) over bar = 0.013, in good agreement (at 1 sigma level) with the value expected in the Lambda CDM concordance model. In addition, our analyses of the ALFALFA sample also provide a measurement of the growth rate of structures , f = 0.56 +/- 0.07, at (z) over bar = 0.013. (AU)

• Processo FAPESP: 19/06040-0 - Estudo das propriedades do universo utilizando dados da radiação cósmica de fundo e de traçadores da estrutura em grande escala
• Beneficiário: Camila Paiva Novaes
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado