de Carvalho, E.
Novaes, C. P.
Total Authors: 4
 Observatorio Nacl, Rua Gen Jose Cristino 77, BR-20921400 Rio De Janeiro, RJ - Brazil
 Univ Estado Amazonas, Ctr Estudos Super Tabatinga, BR-69640000 Abatinga, AM - Brazil
 Inst Nacl Pesquisas Espaciais, Av Aslronautas 1758, Sao Jose Dos Campos, SP - Brazil
Total Affiliations: 3
Monthly Notices of the Royal Astronomical Society;
Web of Science Citations:
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)