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Thread: Time dilation and absorption lines

  1. #1 Time dilation and absorption lines 
    Forum Bachelors Degree PetTastic's Avatar
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    Jul 2010
    London UK
    My understanding of how the luminosity distance is calculated is that time dilation is assumed to slow the rate photons are emitted. (from our view point)

    Does the same apply to absorption lines at high z?
    Does hydrogen in distant clouds absorb photons slower than nearby clouds, if the wavelength hits an absorption line?

    I was looking at "Distant Galaxies Provide Timeline for Universe's Early Days | Distant Galaxies, Big Bang & Cosmology | ESO Very Large Telescope |"
    The hydrogen alpha lines are progressivly redshifted as they travel and being swept across several strong absorption lines before they reach us,
    and was just wondering what effect time dilation had.

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