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@ARTICLE{Pfalzner:888553,
      author       = {Pfalzner, Susanne and Davies, Melvyn B. and Kokaia, Giorgi
                      and Bannister, Michele T.},
      title        = {{O}umuamuas {P}assing through {M}olecular {C}louds},
      journal      = {The astrophysical journal / 1},
      volume       = {903},
      number       = {2},
      issn         = {1538-4357},
      address      = {London},
      publisher    = {Institute of Physics Publ.86747},
      reportid     = {FZJ-2020-05017},
      pages        = {114 -},
      year         = {2020},
      abstract     = {The detections of 1I/'Oumuamua and 2I/Borisov within just
                      two years of each other impressively demonstrate that
                      interstellar objects (ISOs) must be common in the Milky Way.
                      Once released from their parent system, these ISOs travel
                      for billions of years through interstellar space. While
                      often imagined as empty, interstellar space contains gas and
                      dust most prominent in the form of molecular clouds.
                      Performing numerical simulations, we test how often ISOs
                      cross such molecular clouds (MCs). We find that the ISOs
                      pass through MCs amazingly often. In the solar neighborhood,
                      ISOs typically spend $0.1\%-0.2\%$ of their journey inside
                      MCs, for relatively slow ISOs (<5 km s-1) this can increase
                      to $1\%-2\%,$ equivalent to 10-20 Myr per Gyr. Thus the
                      dynamically youngest ISOs spend the longest time in MCs. In
                      other words, MCs must mainly contain relatively young ISOs
                      (<1-2 Gyr). Thus the half-life of the seeding process by
                      ISOs is substantially shorter than a stellar lifetime. The
                      actual amount of time spent in MCs decreases with distance
                      to the Galactic center. We find that ISOs pass through MCs
                      so often that backtracing their path to find their parent
                      star beyond 250 Myr seems pointless. Besides, we give a
                      first estimate of the ISO density depending on the distance
                      to the Galactic center based on the stellar distribution.},
      cin          = {JSC},
      ddc          = {520},
      cid          = {I:(DE-Juel1)JSC-20090406},
      pnm          = {511 - Computational Science and Mathematical Methods
                      (POF3-511)},
      pid          = {G:(DE-HGF)POF3-511},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000588213700001},
      doi          = {10.3847/1538-4357/abb9ae},
      url          = {https://juser.fz-juelich.de/record/888553},
}