Help Calculate Velocity of Supernova Remnant Knot

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To calculate the velocity of a supernova remnant knot, it's essential to understand the relationship between distance and time. The discussion highlights the need for clarity on what "knots" refer to, as angular separation alone does not provide sufficient information about actual distance. The use of redshift is common for determining extragalactic distances, while intergalactic distances may be calibrated using methods like Cepheid variables. Ultimately, the original poster successfully resolved their query regarding the calculation. Accurate measurements and appropriate units are crucial for determining the velocity of supernova remnants.
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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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