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How to Calculate the Flux of a Supernova Remnant

29 Aug 2014, 13:40 UTC
How to Calculate the Flux of a Supernova Remnant
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Question: Good day Sir. How is work? Please I kinda need help. I have a question disturbing my mind. This is question. There is a radio source with the following attributes: Object name: 3C461 RA (hh mm ss): 23 23 … Continue reading →

Question: Good day Sir. How is work?
Please I kinda need help. I have a question disturbing my mind.
This is question.
There is a radio source with the following attributes:
Object name: 3C461
RA (hh mm ss): 23 23 24
Dec (dd mm ss): 58 48 54
Epoch: 2000
Flux Density (Jy): 2477
Frequency(MHz): 1420
Other name : SNR-Cassiopeia A.
My understanding from this is that, when this radio source is observed at 1420MHz, the flux density will be 2477Jy.
My question now is this; if i decide to change my frequency of observation to say 4GHz, will flux density still be 2477Jy?
And if it changes, how am i suppose to calculate the flux density at this new frequency? – Peter
Answer: Cas A is a supernova remnant and thus its radio flux is due primarily to relativistic synchrotron emission. This kind of emission has a spectral index of about -0.5 to -0.75, meaning ...

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