Motions and Structure of the Filamentary Envelope of the Crab Nebula

@article{Trimble1968MotionsAS,
  title={Motions and Structure of the Filamentary Envelope of the Crab Nebula},
  author={Virginia Trimble},
  journal={The Astronomical Journal},
  year={1968},
  volume={73},
  pages={535}
}
  • V. Trimble
  • Published 1 September 1968
  • Physics
  • The Astronomical Journal
Proper motions have been measured for 132 line-emitting filaments in the Crab Nebula on direct plates taken with the 100 and 200-inch telescopes. These motions, if assumed constant and extrapolated backwards in time, converge toward a point about 12" southeast of the double star near the center of the nebula. The filaments approach, on the average, most closely to that point or expansion center in about the year 1140, indicating that the expansion has been somewhat accelerated. Proper motions… 

Figures and Tables from this paper

New Measurements of the Expansion of the Crab Nebula
Published images of the Crab Nebula have been scanned and measured to derive proper motions, the age of the nebula, and its point of origin. Astrometric reductions provided rms errors ranging from
Dusty globules in the Crab Nebula
From existing broad-band images obtained with the Hubble Space Telescope, we located 92 globules, for which we derived positions, dimensions, orientations, extinctions, masses, proper motions, and
3D mapping of the Crab Nebula with SITELLE – I. Deconvolution and kinematic reconstruction
We present a hyperspectral cube of the Crab Nebula obtained with the imaging Fourier transform spectrometer SITELLE on the Canada-France-Hawaii telescope. We describe our techniques used to
The Nature of [Ar III]-Bright Knots in the Crab Nebula
The kinematic and morphological properties of a string of [Ar III]-bright knots in the Crab Nebula are examined using 1994–1999 Hubble Space Telescope (HST) Wide Field Planetary Camera 2 images of
Chandra Observations of the X-Ray Halo around the Crab Nebula
Two Chandra observations have been used to search for thermal X-ray emission from within and around the Crab Nebula. Dead time was minimized by excluding the brightest part of the nebula from the
A 3D kinematic study of the northern ejecta ‘jet’ of the Crab nebula
We present [O III] 4959,5007 emission line spectra (FWHM = 40 km/s) of the Crab Nebula's northern ejecta `jet'. These data, along with a recent [O III] image of the Crab, are used to build
Spectroscopy and Three-Dimensional Imaging of the Crab Nebula
Spectroscopy of the Crab Nebula along different slit directions reveals the three-dimensional structure of the optical nebula. On the basis of the linear radial expansion result first discovered by
New expansion rate measurements of the Crab nebula in radio and optical
We present new radio measurements of the expansion rate of the Crab nebula's synchrotron nebula over a ~30-yr period. We find a convergence date for the radio synchrotron nebula of CE 1255 +- 27. We
Does the Crab Have a Shell?
We present deep images of a region around the Crab Nebula made with the VLA, utilizing new imaging and deconvolution algorithms in a search for a faint radio shell. The existence of a high-velocity,
Detecting the Rapidly Expanding Outer Shell of the Crab Nebula: Where to Look
We present a range of steady-state photoionization simulations, corresponding to different assumed shell geometries and compositions, of the unseen postulated rapidly expanding outer shell to the
...
...

References

SHOWING 1-2 OF 2 REFERENCES
Galactic Structure
  • 1966
Galactic Structure, A
  • Publ. Astr. Obs. Pulkova
  • 1966