The role of the dark matter haloes on the cosmic star formation rate

Autor(es)

Pereira, Eduardo S. ^[1] ; Miranda, Oswaldo D. ^[1]

Afiliação do(s) autor(es)

^[1] Inst Nacl Pesquisas Espaciais, Div Astrofis, BR-12227010 Sao Paulo, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: NEW ASTRONOMY; v. 41, p. 48-52, NOV 2015.
• Citações Web of Science: 0

Resumo

The cosmic star formation rate (CSFR) represents the fraction of gas that is converted into stars within a certain comoving volume and at a given time t. However the evolution of the dark matter haloes and its relationship with the CSFR is not yet clear. In this context, we have investigated the role of the dark halo mass function - DHMF - in the process of gas conversion into stars. We observed a strong dependence between the fraction of baryons in structures, f(b), and the specific mass function used for describing the dark matter haloes. In some cases, we have obtained f(b) greater than one at redshift z = 0. This result indicates that the evolution of dark matter, described by the specific DHMF, could not trace the baryonic matter without a bias parameter. We also observed that the characteristic time-scale for star formation, t, is strongly dependent on the considered DHMF, when the model is confronted against the observational data. Also, as part of this work it was released, under GNU general public license, a Python package called `pycosmicstar' to study the CSFR and its relationship with the DHMF. (C) 2015 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 12/21877-5 - Simulação numérica da evolução da população de buracos negros supermassivos e seu papel na reionização do universo
• Beneficiário: Eduardo dos Santos Pereira
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado