3 papers
astro-ph.HE2021
The Masses of Supernova Remnant Progenitors in NGC 6946
Brad Koplitz, Jared Johnson, Benjamin F. Williams +5
We constrained the progenitor masses for 169 supernova remnants, 8 historically observed supernovae, and the black hole formation candidate in NGC 6946, finding that they are consi…
astro-ph.GA2019
The Masses of Supernova Remnant Progenitors in M83
Benjamin F. Williams, Tristan J. Hillis, William P. Blair +5
We determine the ages of the young, resolved stellar populations at the locations of 237 optically-identified supernova remnants in M83. These age distributions put constraints on…
astro-ph.HE2018
Formation Timescales for High-Mass X-ray Binaries in M33
Kristen Garofali, Benjamin F. Williams, Tristan Hillis +4
We have identified 55 candidate high-mass X-ray binaries (HMXBs) in M33 using available archival {\it HST} and {\it Chandra} imaging to find blue stars associated with X-ray positi…