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

  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 Theodore R. Gull and Chun Shing Jason Pun and George Sonneborn},
  journal={The Astrophysical Journal},
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… 
Detecting the Rapidly Expanding Outer Shell of the Crab Nebula: Where to Look
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Does the Crab Have a Shell
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Ultraviolet spectroscopy of the Crab Nebula done by the International Ultraviolet Explorer satellite is described, and an estimate of the carbon abundance is made, noting data reduction to remove
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The [O III] "skin" around the Crab Nebula was shown by Hester et al. to be the Rayleigh-Taylor (R-T)-unstable interface between the synchrotron nebula and swept-up ejecta from the supernova
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The X-ray pulsar PSR0540–693 was discovered in the Large Magellanic Cloud (LMC) supernova remnant, 0540–69.3, by Seward, Harnden and Helfand1, as a pulse, with repetition period ∼50 ms, in Einstein
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Long-slit spectra of two peripheral regions around the Crab Nebula show no H(alpha) emission down to a flux level of 1.5 x 10(exp -7)erg/sq cm s sr (0.63 Rayleigh), corresponding to an emission
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A prism spectrum of PSR B0540-69, the 50 ms pulsar in the Large Magellanic Cloud, was obtained with the Faint Object Spectrograph on the Hubble Space Telescope. This is only the second pulsar
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