The degeneracy between star formation parameters in dwarf galaxy simulations and the Mstar-Mhalo relation
| Autor: | Vanessa Dury, A. Cloet-Osselaer, J. Schroyen, Sven De Rijcke |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
Physics
Stellar mass Star formation Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Galaxy Dark matter halo Interstellar medium Supernova Space and Planetary Science Astrophysics::Solar and Stellar Astrophysics Astrophysics::Earth and Planetary Astrophysics Halo Astrophysics::Galaxy Astrophysics Dwarf galaxy |
| Zdroj: | Monthly Notices of the Royal Astronomical Society. 423:735-745 |
| ISSN: | 0035-8711 |
| DOI: | 10.1111/j.1365-2966.2012.20913.x |
| Popis: | We present results based on a set of N-Body/SPH 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 idealised, 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. (2010), however we do reproduce the slope of this relation. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Plný text