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How do rotation measures work without dispersion measures 
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#1
Mar2613, 06:40 PM

P: 180

Hi, I was wondering how the heck we can use rotation measures from extragalactic sources? I have been looking around for hours and I still don't understand how they can do it without an independent way to find the electron density along the path. Do they use a different method to find the electron density?
well I understand how we could get an RM, but I don't understand how this could be used to find the magnetic fields without knowing something about the electron density. 


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