INVESTIGADORES
PELLIZZA GONZALEZ Leonardo Javier
artículos
Título:
Stellar feedback from high-mass X-ray binaries in cosmological hydrodynamical simulations
Autor/es:
ARTALE, M.C.; TISSERA, P.B.; PELLIZZA, L.J.
Revista:
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Editorial:
WILEY-BLACKWELL PUBLISHING, INC
Referencias:
Lugar: Londres; Año: 2015 vol. 448 p. 3071 - 3080
ISSN:
0035-8711
Resumen:
We explored the role of X-ray binaries composed by a black hole and a
massive stellar companion [black hole X-ray binaries (BHXs)] as sources
of kinetic feedback by using hydrodynamical cosmological simulations.
Following previous results, our BHX model selects metal-poor stars (Z =
[0, 10-4]) as possible progenitors. The model that better
reproduces observations assumes that an ?20 per cent fraction of
low-metallicity black holes are in binary systems which produces BHXs.
These sources are estimated to deposit ?1052 erg of
kinetic energy per event. With these parameters and in the simulated
volume, we find that the energy injected by BHXs represents ?30
per cent of the total energy released by Type II supernova and BHX
events at redshift z ? 7 and then decreases rapidly as baryons get
chemically enriched. Haloes with virial masses smaller than
?1010 M&sun; (or Tvir ≲
105 K) are the most directly affected ones by BHX feedback.
These haloes host galaxies with stellar masses in the range
107-108 M&sun;. Our results show that
BHX feedback is able to keep the interstellar medium warm, without
removing a significant gas fraction, in agreement with previous
analytical calculations. Consequently, the stellar-to-dark matter mass
ratio is better reproduced at high redshift. Our model also predicts a
stronger evolution of the number of galaxies as a function of the
stellar mass with redshift when BHX feedback is considered. These
findings support previous claims that the BHXs could be an effective
source of feedback in early stages of galaxy evolution.