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Pulsar Frequency Question and Fast Fourier Transform

  1. Jan 31, 2012 #1
    I am researching the application of Fourier transform in radio data processing.
    So when I took a time series of a pulsar (amplitude v. time) and converted the time series into amplitude v. frequency, I found two peak frequencies like these

    http://http://arecibo.tc.cornell.edu/legacypulsardata/ImageView.aspx?file_id=34 [Broken]

    but when I researched the pulsar it's period was stated as 0.06 seconds (so it's spin frequency would be 16 Hz) as stated here:
    http://www.wolframalpha.com/entities/pulsars/psr_j2235+1506/8t/gd/bw/ [Broken]

    What are the two peak frequencies then? And why are they different from the spin frequency stated?

    Thank You,
    I am a high school student, so I am limited in understanding Fourier.
     
    Last edited by a moderator: May 5, 2017
  2. jcsd
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