Chemo-dynamical evolution of tidal dwarf galaxies. I. Method and IMF dependence
- Author(s)
- Sylvia Plöckinger, Gerhard Hensler, Simone Recchi, Nigel Mitchell, Pavel Kroupa
- Abstract
We present high-resolution simulations of tidal dwarf galaxies (TDGs) to investigate their early chemo-dynamical evolution and test their survivability. In this work, the simulation setup is introduced and the response of TDGs to self-consistent star formation (SF) and an external tidal field is examined. Throughout the simulation star cluster particles with variable masses down to 5M⊙ form, depending on the local gas reservoir. For low cluster masses Mcl, the stellar initial mass function (IMF) is considered to be either filled or truncated at a maximal star mass m
max to represent the observed m
max-M
cl relation (IGIMF theory). The evolution of TDGs with fully populated and truncated IMFs are compared to study the impact of stellar energy feedback on their survivability. Both TDGs experience an initial starburst but after a dynamical time they evolve into dwarf galaxies with self-regulated and continuous SF. At this stage, the truncated-IMF model contains about six times more stellar mass than the invariant IMF models, but the final bound gas mass is comparable in both models. In spite of their significantly different SF histories, both TDG models are not disrupted within the first 500 Myr.We conclude that TDGs can survive an early starburst, independent of the underlying IMF description, even though they do not harbour a stabilizing dark matter halo.
- Organisation(s)
- Department of Astrophysics
- External organisation(s)
- Rheinische Friedrich-Wilhelms-Universität Bonn
- Journal
- Monthly Notices of the Royal Astronomical Society
- Volume
- 437
- Pages
- 3980–3993
- No. of pages
- 14
- ISSN
- 0035-8711
- DOI
- https://doi.org/10.1093/mnras/stt2211
- Publication date
- 12-2013
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103003 Astronomy, 103004 Astrophysics
- Keywords
- ASJC Scopus subject areas
- Astronomy and Astrophysics, Space and Planetary Science
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/c5f301b2-829b-4a1e-aef4-50c56a809553