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Pixel count for faint star

  1. Dec 15, 2009 #1
    1. The problem statement, all variables and given/known data
    after subtracting the bias level from your count, you get a value of (N). to find the noise, you calculate sqrt(N) = noise.
    now the question,
    As above, your image has a noise of sqrt(N). What can you say about the presence of a faint star in the image that has a total number of counts that is LESS than sqrt(N)

    2. Relevant equations

    3. The attempt at a solution
    i really havent a clue about this question.
    i would have guessed that its something like the sqrt(N) is an average value, so it is entirely possible for there to be a count less than that value.
    but i dont know enough about the subject to make a decent guess at the question.

  2. jcsd
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