Observations of the Crab Nebula and Its Pulsar in the Far-Ultraviolet and in the Optical* **

@article{Sollerman2000ObservationsOT,
  title={Observations of the Crab Nebula and Its Pulsar in the Far-Ultraviolet and in the Optical* **},
  author={Jesper Sollerman and Peter Lundqvist and Don J. Lindler and Roger A. Chevalier and Claes Fransson and T R Gull and Chun Shing Jason Pun and George Sonneborn},
  journal={The Astrophysical Journal},
  year={2000},
  volume={537},
  pages={861-874}
}
We present far-UV observations of the Crab Nebula and its pulsar made with the Space Telescope Imaging Spectrograph on board the Hubble Space Telescope. Broad, blueshifted absorption arising in the nebula is seen in C IV λ1550, reaching a blueward velocity of ~2500 km s-1. This can be interpreted as evidence for a fast outer shell surrounding the Crab Nebula, and we adopt a spherically symmetric model to constrain the properties of such a shell. From the line profile we find that the density… Expand
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