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Properties of Resonantly Produced Sterile Neutrino Dark Matter Subhalos
Shunsaku Horiuchi, Brandon Bozek, Kevork N. Abazajian +4
The anomalous 3.55 keV X-ray line recently detected towards a number of massive dark matter objects may be interpreted as the radiative decays of 7.1 keV mass sterile neutrino dark…
Resonant Sterile Neutrino Dark Matter in the Local and High-z Universe
Brandon Bozek, Michael Boylan-Kolchin, Shunsaku Horiuchi +3
Sterile neutrinos comprise an entire class of dark matter models that, depending on their production mechanism, can be hot, warm, or cold dark matter. We simulate the Local Group a…
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…
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…
Sterile neutrino dark matter bounds from galaxies of the Local Group
Shunsaku Horiuchi, Philip J. Humphrey, Jose Onorbe +3
We show that the canonical oscillation-based (non-resonant) production of sterile neutrino dark matter is inconsistent at % confidence with observations of galaxies in the Loc…
ELVIS: Exploring the Local Volume in Simulations
Shea Garrison-Kimmel, Michael Boylan-Kolchin, James Bullock +1
We introduce a set of high-resolution dissipationless simulations that model the Local Group (LG) in a cosmological context: Exploring the Local Volume in Simulations (ELVIS). The…
How to Zoom: Bias, Contamination, and Lagrange Volumes in Multimass Cosmological Simulations
Jose Oñorbe, Shea Garrison-Kimmel, Ariyeh H. Maller +3
We perform a suite of multimass cosmological zoom simulations of individual dark matter halos and explore how to best select Lagrangian regions for resimulation without contaminati…
Can Feedback Solve the Too Big to Fail Problem?
Shea Garrison-Kimmel, Miguel Rocha, Michael Boylan-Kolchin +2
The observed central densities of Milky Way dwarf spheroidal galaxies (dSphs) are significantly lower than the densities of the largest (Vmax about 35 km/s) subhalos found in dissi…
Cosmological Simulations with Self-Interacting Dark Matter I: Constant Density Cores and Substructure
Miguel Rocha, Annika H. G. Peter, James S. Bullock +4
We use cosmological simulations to study the effects of self-interacting dark matter (SIDM) on the density profiles and substructure counts of dark matter halos from the scales of…