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Helium abundance

  1. Jun 27, 2011 #1

    Here is an info I don't manage to obtain from anywhere so far !!
    What is the "best-estimate" of the Helium abundance (the He/H ratio) in the interstellar medium of galaxies in the nearby Universe and at high redshift?

    I know the primordial He abundance is Y = 0.24 but what is the value for the ISM of galaxies?

    Does anybody know that? any reference please?

    Thanks !
  2. jcsd
  3. Jun 28, 2011 #2


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    I venture a guess that is about the same ration. Maybe a little more skewed towards helium now, but mostly still the same.
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