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Core Formation in Dwarf Halos with Self Interacting Dark Matter: No Fine-Tuning Necessary
Oliver D. Elbert, James S. Bullock, Shea Garrison-Kimmel +3
We investigate the effect of self-interacting dark matter (SIDM) on the density profiles of isolated dwarf dark matter halos -- the scale of relev…
Cosmological Simulations of Decaying Dark Matter: Implications for Small-scale Structure of Dark Matter Halos
Mei-Yu Wang, Annika H. G. Peter, Louis E. Strigari +4
We present a set of N-body simulations of a class of models in which an unstable dark matter particle decays into a stable non-interacting dark matter particle, with decay lifetime…
Satellite Dwarf Galaxies in a Hierarchical Universe: The Prevalence of Dwarf-Dwarf Major Mergers
Alis Deason, Andrew Wetzel, Shea Garrison-Kimmel
Mergers are a common phenomenon in hierarchical structure formation, especially for massive galaxies and clusters, but their importance for dwarf galaxies in the Local Group remain…
Running with BICEP2: Implications for Small-Scale Problems in CDM
Shea Garrison-Kimmel, Shunsaku Horiuchi, Kevork N. Abazajian +2
The BICEP2 results, when interpreted as a gravitational wave signal and combined with other CMB data, suggest a roll-off in power towards small scales in the primordial matter powe…
Near-Field Limits on the Role of Faint Galaxies in Cosmic Reionization
Michael Boylan-Kolchin, James S. Bullock, Shea Garrison-Kimmel
Reionizing the Universe with galaxies appears to require significant star formation in low-mass halos at early times, while local dwarf galaxy counts tell us that star formation ha…
Too Big to Fail in the Local Group
Shea Garrison-Kimmel, Michael Boylan-Kolchin, James S. Bullock +1
We compare the dynamical masses of dwarf galaxies in the Local Group (LG) to the predicted masses of halos in the ELVIS suite of CDM simulations, a sample of 48 Galaxy-size host…