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Article overview
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The chemo-turbulent fragmentation of the interstellar medium: The impact of metallicity on global star formation | | S. Walch
; R. Wuensch
; A. Burkert
; S. Glover
; A. Whitworth
; | | Date: |
14 Jan 2011 | | Abstract: | We study the influence of gas metallicity and turbulence on the evolution of
the two-phase interstellar medium (warm and cold atomic phases), and thereby
constrain the initial conditions for star formation prevailing in turbulent
gas. We perform high-resolution simulations in 3D, including a realistic
non-equilibrium treatment of the ionization state of the gas, and examine both
driven and decaying turbulence. This allows us to explore variations in the
metallicity Z. In this paper, we study solar metallicity, Z = Z_sun, and low
metallicity Z = 0.001 Z_sun gas. For driven, large-scale turbulence, we find
that the influence of the metallicity on the amount of mass in the cold gas
component is small. However, in decaying turbulent conditions this picture is
much changed. While cold regions survive in the case of solar metallicity, they
are quickly heated and dispersed in low metallicity gas. This result suggests
that star formation can be suppressed in environments of low metallicity,
unless a strong turbulent driver is acting on time scales shorter than a few
turbulent crossing times. Inter alia this finding could explain the overall
inefficient star formation as well as the burst-like mode of star formation
found in metal-poor, gas-rich systems like dwarf galaxies. | | Source: | arXiv, 1101.2894 | | Services: | Forum | Review | PDF | Favorites | |
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