Corpus ID: 211259409

The Edge of the Galaxy

  title={The Edge of the Galaxy},
  author={Alis J. Deason and Azadeh Fattahi and Carlos S. Frenk and Robert J. J. Grand and Kyle A. Oman and Shea Garrison-Kimmel and Christine M. Simpson and Julio Fortanete Navarro},
  journal={arXiv: Astrophysics of Galaxies},
  • Alis J. Deason, Azadeh Fattahi, +5 authors Julio Fortanete Navarro
  • Published 2020
  • Physics
  • arXiv: Astrophysics of Galaxies
  • We use cosmological simulations of isolated Milky Way-mass galaxies, as well as Local Group analogues, to define the "edge'' --- a caustic manifested in a drop in density or radial velocity --- of Galactic-sized haloes, both in dark matter and in stars. In the dark matter, we typically identify two caustics: the outermost caustic located at ~1.4r_200m corresponding to the "splashback'' radius, and a second caustic located at ~0.6r_200m which likely corresponds to the edge of the virialized… CONTINUE READING