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Hard Spectrum

  1. Aug 23, 2008 #1

    nicksauce

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    "Hard" Spectrum

    What exactly is meant when a spectrum is said to be "hard" or "soft", or "harder"/"softer" compared to a different spectrum?


    Cheers,
    Nick
     
  2. jcsd
  3. Aug 23, 2008 #2

    George Jones

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    Re: "Hard" Spectrum

    Hard gamma rays, for example, have higher energy, higher frequency, and shorter wavelength than soft gamma rays.
     
  4. Aug 23, 2008 #3

    nicksauce

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    Re: "Hard" Spectrum

    Thanks George Jones. I'm not entirely sure if that answers my question though.

    For example consider the following from "Model neutron star atmospheres with low magnetic fields" Zavlin, Pavlov, Shibanov 1996. Astron. Astrophys 315, 141-152. http://arxiv.org/abs/astro-ph/9604072

    In the abstract they write "... We show that the model atmosphere spectra are substantially different from the black-body spectra. For light element atmospheres, the flux is greater than the blackbody flux, and the spectrum is harder..."

    What is the meaning of harder in this context?
     
  5. Aug 23, 2008 #4

    George Jones

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    Re: "Hard" Spectrum

    From the paper
     
  6. Aug 23, 2008 #5

    nicksauce

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    Re: "Hard" Spectrum

    Ah... thank you very much.
     
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