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The degeneracy between star formation parameters in dwarf galaxy simulations and the Mstar-Mhalo relation

Annelies Cloet-Osselaer (UGent) , Sven De Rijcke (UGent) , Joeri Schroyen (UGent) and Vanessa Dury (UGent)
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Abstract
We present results based on a set of N-body/smoothed particle hydrodynamics simulations of isolated dwarf galaxies. The simulations take into account star formation, stellar feedback, radiative cooling and metal enrichment. The dark matter halo initially has a cusped profile, but, at least in these simulations, starting from idealized, spherically symmetric initial conditions, a natural conversion to a core is observed due to gas dynamics and stellar feedback. A degeneracy between the efficiency with which the interstellar medium absorbs energy feedback from supernovae and stellar winds on the one hand, and the density threshold for star formation on the other, is found. We performed a parameter survey to determine, with the aid of the observed kinematic and photometric scaling relations, which combinations of these two parameters produce simulated galaxies that are in agreement with the observations. With the implemented physics we are unable to reproduce the relation between the stellar mass and the halo mass as determined by Guo et al.; however, we do reproduce the slope of this relation.
Keywords
PHOTOMETRIC PROPERTIES, STELLAR FEEDBACK, IRREGULAR GALAXIES, RAM-PRESSURE, MASS, galaxies: formation, LOCAL GROUP DWARF, DARK-MATTER CORES, SPHEROIDAL GALAXIES, ELLIPTIC GALAXIES, COSMOLOGICAL SIMULATIONS, methods: numerical, galaxies: dwarf, galaxies: evolution

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Chicago
Cloet-Osselaer, Annelies, Sven De Rijcke, Joeri Schroyen, and Vanessa Dury. 2012. “The Degeneracy Between Star Formation Parameters in Dwarf Galaxy Simulations and the Mstar-Mhalo Relation.” Monthly Notices of the Royal Astronomical Society 423 (1): 735–745.
APA
Cloet-Osselaer, A., De Rijcke, S., Schroyen, J., & Dury, V. (2012). The degeneracy between star formation parameters in dwarf galaxy simulations and the Mstar-Mhalo relation. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 423(1), 735–745.
Vancouver
1.
Cloet-Osselaer A, De Rijcke S, Schroyen J, Dury V. The degeneracy between star formation parameters in dwarf galaxy simulations and the Mstar-Mhalo relation. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. 2012;423(1):735–45.
MLA
Cloet-Osselaer, Annelies, Sven De Rijcke, Joeri Schroyen, et al. “The Degeneracy Between Star Formation Parameters in Dwarf Galaxy Simulations and the Mstar-Mhalo Relation.” MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 423.1 (2012): 735–745. Print.
@article{2944806,
  abstract     = {We present results based on a set of N-body/smoothed particle hydrodynamics simulations of isolated dwarf galaxies. The simulations take into account star formation, stellar feedback, radiative cooling and metal enrichment. The dark matter halo initially has a cusped profile, but, at least in these simulations, starting from idealized, spherically symmetric initial conditions, a natural conversion to a core is observed due to gas dynamics and stellar feedback. A degeneracy between the efficiency with which the interstellar medium absorbs energy feedback from supernovae and stellar winds on the one hand, and the density threshold for star formation on the other, is found. We performed a parameter survey to determine, with the aid of the observed kinematic and photometric scaling relations, which combinations of these two parameters produce simulated galaxies that are in agreement with the observations. With the implemented physics we are unable to reproduce the relation between the stellar mass and the halo mass as determined by Guo et al.; however, we do reproduce the slope of this relation.},
  author       = {Cloet-Osselaer, Annelies and De Rijcke, Sven and Schroyen, Joeri and Dury, Vanessa},
  issn         = {0035-8711},
  journal      = {MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY},
  keywords     = {PHOTOMETRIC PROPERTIES,STELLAR FEEDBACK,IRREGULAR GALAXIES,RAM-PRESSURE,MASS,galaxies: formation,LOCAL GROUP DWARF,DARK-MATTER CORES,SPHEROIDAL GALAXIES,ELLIPTIC GALAXIES,COSMOLOGICAL SIMULATIONS,methods: numerical,galaxies: dwarf,galaxies: evolution},
  language     = {eng},
  number       = {1},
  pages        = {735--745},
  title        = {The degeneracy between star formation parameters in dwarf galaxy simulations and the Mstar-Mhalo relation},
  url          = {http://dx.doi.org/10.1111/j.1365-2966.2012.20913.x},
  volume       = {423},
  year         = {2012},
}

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