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Extended sources |
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![]() | ![]() | All formulae derived above are valid for point sources at the phase centre of the interferometer. The behaviour of extended sources is slightly different. |
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![]() | ![]() | For a point source, the quantity |
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![]() | ![]() | The same is not true for extended sources! For an extended source (with constant surface brightness) that is larger than the synthesised beam, the flux density per beam varies as a function of beam size as |
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![]() | ![]() | ![]() |
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![]() | ![]() | where |
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![]() | ![]() | RESOLUTION KILLS! |
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