Panspermia in a Milky Way-like Galaxy
  We study the process of panspermia in Milky Way-like galaxies by modeling the
probability of successful travel of organic compounds between stars harboring
potentially habitable planets. To this end, we apply the modified habitability
recipe of Gobat & Hong (2016) to a model galaxy from the MUGS suite of zoom-in
cosmological simulations. We find that, unlike habitability, which only
occupies narrow dynamic range over the entire galaxy, the panspermia
probability can vary be orders of magnitude between the inner ($R, b = 1-4 {\rm
kpc}$) and outer disk. However, only a small fraction of star particles have
very large values of panspermia probability and, consequently, the fraction of
star particles where the panspermia process is more effective than prebiotic
evolution is much lower than from na\"ive expectations based on the ratio
between panspermia probability and natural habitability.
