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How the first stars shaped the faintest gas-dominated dwarf galaxies

Robbert Verbeke (UGent) , Bert Vandenbroucke (UGent) and Sven De Rijcke (UGent)
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Abstract
Low-mass dwarf galaxies are very sensitive test-beds for theories of cosmic structure formation since their weak gravitational fields allow the effects of the relevant physical processes to clearly stand out. Up to now, no unified account has existed of the sometimes seemingly conflicting properties of the faintest isolated dwarfs in and around the Local Group, such as Leo T and the recently discovered Leo. P and Pisces. A systems. Using new numerical simulations, we show that this serious challenge to our understanding of galaxy formation can be effectively resolved by taking into account the regulating influence of the ultraviolet radiation of the first population of stars on a dwarf's star formation rate while otherwise staying within the standard cosmological paradigm for structure formation. These simulations produce faint, gas-dominated, star-forming dwarf galaxies that lie on the baryonic Tully-Fisher relation and that successfully reproduce a broad range of chemical, kinematical, and structural observables of real late-type dwarf galaxies. Furthermore, we stress the importance of obtaining properties of simulated galaxies in a manner as close as possible to the typically employed observational techniques.
Keywords
galaxies: evolution, galaxies: dwarf, galaxies: formation, methods: numerical, stars: Population III, HUBBLE-SPACE-TELESCOPE, HIGH-VELOCITY CLOUDS, DARK-MATTER HALOES, COSMOLOGICAL HYDRODYNAMICAL SIMULATIONS, TULLY-FISHER RELATION, ALFALFA DISCOVERY, LOCAL GROUP, IRREGULAR GALAXIES, SPHEROIDAL GALAXIES, FORMATION HISTORIES

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Citation

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Chicago
Verbeke, Robbert, Bert Vandenbroucke, and Sven De Rijcke. 2015. “How the First Stars Shaped the Faintest Gas-dominated Dwarf Galaxies.” Astrophysical Journal 815 (2).
APA
Verbeke, Robbert, Vandenbroucke, B., & De Rijcke, S. (2015). How the first stars shaped the faintest gas-dominated dwarf galaxies. ASTROPHYSICAL JOURNAL, 815(2).
Vancouver
1.
Verbeke R, Vandenbroucke B, De Rijcke S. How the first stars shaped the faintest gas-dominated dwarf galaxies. ASTROPHYSICAL JOURNAL. 2015;815(2).
MLA
Verbeke, Robbert, Bert Vandenbroucke, and Sven De Rijcke. “How the First Stars Shaped the Faintest Gas-dominated Dwarf Galaxies.” ASTROPHYSICAL JOURNAL 815.2 (2015): n. pag. Print.
@article{7279989,
  abstract     = {Low-mass dwarf galaxies are very sensitive test-beds for theories of cosmic structure formation since their weak gravitational fields allow the effects of the relevant physical processes to clearly stand out. Up to now, no unified account has existed of the sometimes seemingly conflicting properties of the faintest isolated dwarfs in and around the Local Group, such as Leo T and the recently discovered Leo. P and Pisces. A systems. Using new numerical simulations, we show that this serious challenge to our understanding of galaxy formation can be effectively resolved by taking into account the regulating influence of the ultraviolet radiation of the first population of stars on a dwarf's star formation rate while otherwise staying within the standard cosmological paradigm for structure formation. These simulations produce faint, gas-dominated, star-forming dwarf galaxies that lie on the baryonic Tully-Fisher relation and that successfully reproduce a broad range of chemical, kinematical, and structural observables of real late-type dwarf galaxies. Furthermore, we stress the importance of obtaining properties of simulated galaxies in a manner as close as possible to the typically employed observational techniques.},
  articleno    = {85},
  author       = {Verbeke, Robbert and Vandenbroucke, Bert and De Rijcke, Sven},
  issn         = {0004-637X},
  journal      = {ASTROPHYSICAL JOURNAL},
  language     = {eng},
  number       = {2},
  pages        = {13},
  title        = {How the first stars shaped the faintest gas-dominated dwarf galaxies},
  url          = {http://dx.doi.org/10.1088/0004-637X/815/2/85},
  volume       = {815},
  year         = {2015},
}

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