Help Calculate Velocity of Supernova Remnant Knot

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SUMMARY

The discussion centers on calculating the velocity of a supernova remnant knot, specifically in the context of Cas A. The user, Fran, initially struggled with determining the correct units for velocity after calculating the angular distance in arcseconds. A key insight provided is that most scientists utilize redshift for extragalactic distances, while intergalactic distances are often calibrated using Cepheid variables or tipping magnitudes. Fran ultimately resolved the issue independently.

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  • Understanding of supernova remnants and their significance in astrophysics
  • Familiarity with angular measurements, specifically arcseconds
  • Knowledge of redshift and its application in measuring extragalactic distances
  • Basic concepts of Cepheid variables and their role in distance calibration
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  • Research methods for calculating velocity in astrophysical contexts
  • Learn about the application of redshift in cosmology
  • Study Cepheid variable stars and their importance in distance measurement
  • Explore the concept of tipping magnitudes and their use in astronomical observations
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Astronomy students, astrophysicists, and researchers involved in supernova studies or distance measurement techniques in cosmology.

maverick60
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Supernova Remnant Help!

Hi guys,

Im just about to finish up my project work for my thesis which is on Cas A. I have calculate the distance between my knot and old knot from a previous experiment in arcsecs. I now need to find the velocity of my knot. Any ideas on how to calculate it?? I know i need to divide the distance by the number of years but I don't know what units.

Cheers,
Fran.
 
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Too vague, what 'knots' are you referring to? Angular separation tells you next to nothing about distance. Most scientists rely on redshift for extragalactic distances. Intergalactic distances are usually calibrated using Cepheids or tipping magnitudes.
 


its cool i managed to work it out thanks.
 

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