Research Interests

Cosmology and galaxy formation, including:

Group Members


Long-term collaborations

Some Research Highlights:

Too big to fail? The puzzling darkness of massive Milky Way subhalos
M. Boylan-Kolchin, J. S. Bullock, & M. Kaplinghat (2011), MNRAS, 415, L40
Scientific American summary

The Space Motion of Leo I: The Mass of the Milky Way's Dark Matter Halo
M. Boylan-Kolchin, J. S. Bullock, S. T. Sohn, G. Besla, & R. P. van der Marel (2013), ApJ, 768, 140
Scientific American write-up

Segue 2: The Least Massive Galaxy
E. Kirby, M. Boylan-Kolchin, J. Cohen, M. Geha, M. Kaplinghat, & J. S. Bullock (2013), ApJ, 770, 16
Press: NY Times, LA Times, New Scientist, Time

ELVIS: Exploring the Local Volume in Simulations
S. Garrison-Kimmel, M. Boylan-Kolchin, J. Bullock, K. Lee (2014), MNRAS, 438, 2596
website (including simulation data)

Near-Field Limits on the Role of Faint Galaxies in Cosmic Reionization
M. Boylan-Kolchin, J. Bullock, S. Garrison-Kimmel (2014), MNRAS, 443, L44

The Local Group as a Time Machine: Studying the High-Redshift Universe with Nearby Galaxies
M. Boylan-Kolchin, D. Weisz, B. Johnson, J. Bullock, C. Conroy, A. Fitts (2015), MNRAS, 453, 1503
Harvard/Smithsonian Center for Astrophysics Science Update

The Local Group: The Ultimate Deep Field
M. Boylan-Kolchin, D. Weisz, J. Bullock, M. Cooper (2016), MNRAS, 462, L51
Science Editors' Choice pick

The Little Engines That Could? Globular Clusters Contribute Significantly to Reionization-era Star Formation
M. Boylan-Kolchin (2018), MNRAS, 479, 332
astrobites write-up and second write-up

We gratefully acknowledge grant support from the NSF and NASA, as well as computing resources from NSF’s Extreme Science and Engineering Discovery Environment (XSEDE), The University of Texas through the Texas Advanced Computing Center (TACC), and NASA’s High-End Computing facilities (NAS and NCCS).