Photon Flux in a Galaxy
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A galaxy with an apparent magnitude in the V band (λc ~ 5550 angstroms, width δλ ~ 800 angstroms) of mV = 22.5 mag is observed with the Palomar 200-inch telescope. How many photons per second are collected from this galaxy over the 200-inch (~ 500 cm) diameter mirror? (assume for simplicity that the filter throughput is = 1 within that bandpass, and that galaxy's photon spectum is flat, and ignore any absorption or inefficiencies).
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Solution Summary
The solution estimates the number of photons per second gathered by the Palomar 200-inch telescope from a distant galaxy, with step-by-step calculations and explanations.
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