How Galaxies form Stars August 24 2016 Robbert Verbeke 1 Bert Vandenbroucke Sven De Rijcke Ghent University 1 Robbertverbekeugentbe Rbhfd Λ CDM Standard model for cosmology ID: 1046367
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1. Simulations of realistic dwarf galaxies including Pop III feedbackHow Galaxies form Stars – August 24 2016 Robbert Verbeke1Bert VandenbrouckeSven De RijckeGhent University1Robbert.verbeke@ugent.be @Rbhfd
2. ΛCDMStandard model for cosmologyDwarf regime“Missing satellites”“Too big to fail”“Planes of satellites”Dwarfs are ideal testbeds for cosmological and galaxy formation models
3. Models Of Realistic dwarfs In ActionMoRIAGadget-2 (N-body/SPH) (Springel et al. 2005)Dwarf galaxy scaleHigh resolution (103-4 M⊙, 5-15 pc) Cosmologically motivated merger tree (Cloet-Osselaer et al. 2014)Star formationGas cooling and heating (De Rijcke et al. 2013)Feedback from supernovae and UV radiation from massive starsChemical enrichmentHeating by cosmic UV background
4. DM halos with vc ≲ 30 km/s should not contain neutral gas (e.g. Sawala et al. 2014b)vc predicted from matter distributionBaryonic Tully-Fisher relation
5. Mock HI spectrum: vc = W20/2Mock observations
6. Mock HI spectrum: vc = W20/2Mock observations
7. Out of pristine, unenriched gasTop-heavy IMF: 0,7 – 300 M⊙ (Susa et al. 2014)[Fe/H] < -54 x more SNII energy 40 x more UV radiation from massive starsLower star formation at early timesFirst stars
8. Baryonic Tully-Fisher relation
9. Baryonic Tully-Fisher relation
10. Broad range of star formation histories is reproducedStar formation histories
11. Star formation properties
12. M*-Mhalo
13. Blue Compact DwarfsTriggering mechanism?Gaseous infall (Verbeke et al. 2014)Tidal interactionMerger
14. BCDs
15. BCDs – Surface Brightness Profiles
16. BCDs – Velocity curves
17. SummaryDwarf galaxies are a challenge for ΛCDM Advanced models are necessaryWay of producing mock observations is crucialRealistic dwarfs can be simulatedOur MoRIA simulations can be used to investigate other open questions in astrophysics & cosmologyVerbeke, Vandenbroucke & De Rijcke (2015)Vandenbroucke, Verbeke & De Rijcke (2016)