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An analytic surface density profile for CDM halos and gravitational lensing studies
Alexandres Lazar, James S. Bullock, Anna Nierenberg +2
We introduce an analytic surface density profile for dark matter halos that accurately reproduces the structure of simulated halos of mass , makin…
Out of sight, out of mind? The impact of correlated clustering in substructure lensing
Alexandres Lazar, James S. Bullock, Michael Boylan-Kolchin +3
A promising route for revealing the existence of dark matter structures on mass scales smaller than the faintest galaxies is through their effect on strong gravitational lenses. We…
Scalar Field Dark Matter: Helping or Hurting Small-Scale Problems in Cosmology?
Victor H. Robles, James S. Bullock, Michael Boylan-Kolchin
Building upon results of cosmological simulations of ultra-light scalar field dark matter (SFDM), we present a comprehensive model for the density profiles of SFDM haloes as a func…
Small-Scale Challenges to the CDM Paradigm
James S. Bullock, Michael Boylan-Kolchin
The dark energy plus cold dark matter (CDM) cosmological model has been a demonstrably successful framework for predicting and explaining the large-scale structure of Universe a…
The Local Group: The Ultimate Deep Field
Michael Boylan-Kolchin, Daniel R. Weisz, James S. Bullock +1
Near-field cosmology -- using detailed observations of the Local Group and its environs to study wide-ranging questions in galaxy formation and dark matter physics -- has become a…
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…
The Local Group as a time machine: studying the high-redshift Universe with nearby galaxies
Michael Boylan-Kolchin, Daniel R. Weisz, Benjamin D. Johnson +3
We infer the UV luminosities of Local Group galaxies at early cosmic times ( and ) by combining stellar population synthesis modeling with star formation histor…
XMM-Newton Survey of Local O VII Absorption Lines in the Spectra of Active Galactic Nuclei
Taotao Fang, David A. Buote, James S. Bullock +1
Highly ionized, z=0 metal absorption lines detected in the X-ray spectra of background active galactic nuclei (AGNs) provide an effective method to probe the hot ( K) ga…
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…
The High- Universe Confronts Warm Dark Matter: Galaxy Counts, Reionization and the Nature of Dark Matter
Christian Schultz, Jose Oñorbe, Kevork N. Abazajian +1
We use -body simulations to show that high-redshift galaxy counts provide an interesting constraint on the nature of dark matter, specifically Warm Dark Matter (WDM), owing to t…
Galaxies on FIRE (Feedback In Realistic Environments): Stellar Feedback Explains Cosmologically Inefficient Star Formation
Philip F. Hopkins, Dusan Keres, Jose Onorbe +4
We present a series of high-resolution cosmological simulations of galaxy formation to z=0, spanning halo masses ~10^8-10^13 M_sun, and stellar masses ~10^4-10^11. Our simulations…
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…
A Dichotomy in Satellite Quenching Around L* Galaxies
John I. Phillips, Coral Wheeler, Michael Boylan-Kolchin +3
We examine the star formation properties of bright (~0.1 L*) satellites around isolated ~L* hosts in the local Universe using spectroscopically confirmed systems in the Sloan Digit…
Cold dark matter: controversies on small scales
David H. Weinberg, James S. Bullock, Fabio Governato +2
The cold dark matter (CDM) cosmological model has been remarkably successful in explaining cosmic structure over an enormous span of redshift, but it has faced persistent challenge…
Segue 2: The Least Massive Galaxy
Evan N. Kirby, Michael Boylan-Kolchin, Judith G. Cohen +3
Segue 2, discovered by Belokurov et al. (2009), is a galaxy with a luminosity of only 900 L_sun. We present Keck/DEIMOS spectroscopy of 25 members of Segue 2--a threefold increase…
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…
The Outer Limits of the M31 System: Kinematics of the Dwarf Galaxy Satellites And XXVIII and And XXIX
Erik J. Tollerud, Marla C. Geha, Luis C. Vargas +1
We present Keck/DEIMOS spectroscopy of resolved stars in the M31 satellites And XXVIII & And XXIX. We show that these are likely self-bound galaxies based on 18 and 24 members in A…
Groups of two galaxies in SDSS: implications of colours on star formation quenching time-scales
Christopher Q. Trinh, Elizabeth J. Barton, James S. Bullock +3
We have devised a method to select galaxies that are isolated in their dark matter halo (N=1 systems) and galaxies that reside in a group of exactly two (N=2 systems). Our N=2 syst…
Angular Momentum Acquisition in Galaxy Halos
Kyle R. Stewart, Alyson M. Brooks, James S. Bullock +4
We use high-resolution cosmological hydrodynamic simulations to study the angular momentum acquisition of gaseous halos around Milky Way sized galaxies. We find that cold mode accr…
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…
On the Hot Gas Content of the Milky Way Halo
Taotao Fang, James S. Bullock, Michael Boylan-Kolchin
The Milky Way appears to be missing baryons, as the observed mass in stars and gas is well below the cosmic mean. One possibility is that a substantial fraction of the Galaxy's bar…
Addressing Decadal Survey Science through Community Access to Highly Multiplexed Spectroscopy with BigBOSS on the KPNO Mayall Telescope
Caty Pilachowski, Carles Badenes, Stephen Bailey +87
This document summarizes the results of a community-based discussion of the potential science impact of the Mayall+BigBOSS highly multiplexed multi-object spectroscopic capability.…