What are the smallest galaxies?. Joss Bland-Hawthorn University of Sydney Missing Baryons Women's College 2009. Collaborators: R. Sutherland, T. Karlsson. Building blocks of the Galaxy Ultra faint dwarfs – just what are these? Fyris simulations of supernovae in Einasto DM halos
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University of Sydney
Women's College 2009
Collaborators: R. Sutherland, T. Karlsson
"the smallest DM halo that can retain cold gas in the event of a single SN explosion"
coldest clouds ~50 K, ~102 cm-3
Fractal medium (Kolmogorov)
High order Gudonov scheme
Refined not dynamic mesh
Split-sweep; shock capturing
Asplund (2005) metals except...
[Fe/H] = -4.0
Mg, Si, Ca: 2.5×
H2, dust turned off
Sutherland & Dopita (2003)
These models were chosen to resemble UFDs, i.e. very low fb
We have begun to consider higher fb models where the core baryons modify the potential – self gravity must be included
Gas retention post SN at t=200,000 yrs is ~5%
Fall back gives ~15%
Off centred SN retains ~30%
More gas retained if fb increased
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How do UFDs receive and then retain their baryons?
Are they stripped cores of larger ancient systems?
binding energy of DM halo