Cassiopeia A (BW)

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About this Image

Cassiopeia A (Cas A) is the remnant of the supernova event which was quite possibly witnessed by Flamsteed in AD 1680. At that time the outer layers of a massive star were ejected with high velocity, sweeping up a shell of the surrounding interstellar material. This shell has now decelerated sufficiently so that the more slowly expanding material from deeper within the star is breaking through the shell from inside. The passage of this ejecta through the shell gives rise to conical extensions which leave crater-like structures in their wake.

Investigator(s):  P.E. Angerhofer, R. Braun, S.F. Gull, R.A. Perley, and R.J. Tuffs

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Technical Data

    Telescope VLA 
    Date of Observation 1983-00-00 
    Type of Observation Continuum Observations 
    Band C 
    Wavelength 6 cm 
    Frequency 5.0 GHz 
    Center of Image RA: 23:21:13.00, Dec: 58:32:35.00 (B1950)  
    Field of View 0.1000 x 0.1000 degrees  
    Technical Caption Bandwidth synthesis used to improve spatial frequency content Details: Fully processed radiograph of the total intensity of CasA, deconvolved from the 4096 x 4096 pixel "dirty" image and beam via a Maximum Entropy Method ('VM') algorithm in 20 minutes of CPU time on a Cray X-MP.  

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