Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Shot noise

  1. Aug 12, 2005 #1
    I am reading about galaxy surveys.

    I want to know what is shot noise ? how we estimate it
    into real and fourier space ? I am basically reading
    astro-ph/0503603 & astro-ph/0503604. I am not able to solve exercise 4, 5, 6.

    I will be thankful, if anybody can provide me some reference.
  2. jcsd
  3. Aug 13, 2005 #2


    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    It just means the inherent uncertainty of measuring a distribution in discrete bundles. For example, I could be trying to approximate the density of the universe at some location based on the number of galaxies at that location and dividing by the volume. This won't tell me the density exactly, it will just give me an estimate based on the information available. It's usually treated as a Poisson process.

    It can be treated with smoothing or filtering, but it doesn't look like you want something as complicated as that for your problem. Try to think in simpler terms. What is the expectation value of the correlation function it's calculated from something that's Poisson distributed?
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Threads - Shot noise Date
A shot I got of Jupiter & moons last night Apr 21, 2015
Amazing shot of a meteor over Loch Ness Mar 18, 2015
New closer shots of Ceres Jan 27, 2015
Stargazing Shot(s) of the lunar eclipse Dec 21, 2010