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Cosmic evolution of the atomic and molecular gas contents of galaxies

Lagos, Claudia del P. ; Baugh, Carlton M. ; Lacey, Cedric G. ; Benson, Andrew J. ; Kim, Han-Seek ; Power, Chris

Monthly notices of the Royal Astronomical Society, 2011-12, Vol.418 (3), p.1649-1667 [Periódico revisado por pares]

Oxford, UK: Blackwell Publishing Ltd

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  • Título:
    Cosmic evolution of the atomic and molecular gas contents of galaxies
  • Autor: Lagos, Claudia del P. ; Baugh, Carlton M. ; Lacey, Cedric G. ; Benson, Andrew J. ; Kim, Han-Seek ; Power, Chris
  • Assuntos: Astronomy ; Astrophysics ; Atoms & subatomic particles ; Earth, ocean, space ; Exact sciences and technology ; galaxies: evolution ; galaxies: formation ; galaxies: ISM ; Hydrogen ; Star & galaxy formation ; Stars & galaxies ; stars: formation
  • É parte de: Monthly notices of the Royal Astronomical Society, 2011-12, Vol.418 (3), p.1649-1667
  • Notas: ark:/67375/WNG-19H5VCSB-2
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  • Descrição: We study the evolution of the cold gas content of galaxies by splitting the interstellar medium into its atomic and molecular hydrogen components, using the galaxy formation model galform in the Λ cold dark matter framework. We calculate the molecular-to-atomic hydrogen mass ratio, H2/H i, in each galaxy using two different approaches, the pressure-based empirical relation of Blitz & Rosolowsky and the theoretical model of Krumholz, McKeee & Tumlinson, and apply them to consistently calculate the star formation rates of galaxies. We find that the model based on the Blitz & Rosolowsky law predicts an H i mass function, 12CO (1-0) luminosity function, correlations between H2/H i and stellar and cold gas mass, and infrared-12CO molecule luminosity relation in good agreement with local and high-redshift observations. The H i mass function evolves weakly with redshift, with the number density of high-mass galaxies decreasing with increasing redshift. In the case of the H2 mass function, the number density of massive galaxies increases strongly from z= 0 to 2, followed by weak evolution up to z= 4. We also find that H2/H i of galaxies is strongly dependent on stellar and cold gas mass, and also on redshift. The slopes of the correlations between H2/H i and stellar and cold gas mass hardly evolve, but the normalization increases by up to two orders of magnitude from z= 0 to 8. The strong evolution in the H2 mass function and H2/H i is primarily due to the evolution in the sizes of galaxies and, secondarily, in the gas fractions. The predicted cosmic density evolution of H i agrees with the observed evolution inferred from damped Lyα systems, and is always dominated by the H i content of low- and intermediate-mass haloes. We find that previous theoretical studies have largely overestimated the redshift evolution of the global H2/H i due to limited resolution. We predict a maximum of at z≈ 3.5.
  • Editor: Oxford, UK: Blackwell Publishing Ltd
  • Idioma: Inglês
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