A ‘head/tail’ plasmon model with a Hubble law velocity profile

@article{Raga2020AP,
  title={A ‘head/tail’ plasmon model with a Hubble law velocity profile},
  author={Alejandro C. Raga and A. Rodr{\'i}guez-Gonz{\'a}lez and Liliana Hern{\'a}ndez-Mart{\'i}nez and J. Cant{\'o} and A. Castellanos-Ram{\'i}rez},
  journal={Monthly Notices of the Royal Astronomical Society},
  year={2020},
  volume={499}
}
We present a model of a hypersonic, collimated, "single pulse" outflow, produced by an event with an ejection velocity that first grows, reaches a peak, and then decreases again to zero velocity in a finite time (simultaneously, the ejection density can have an arbitrary time-variability). We obtain a flow with a leading "head" and a trailing "tail" that for times greater than the width of the pulse develops a linear, "Hubble law" velocity vs. position. We present an analytic model for a simple… 
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