playground:here
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The plan is to use the Carlson and White (2012) approach to remapping a simulated cube to make a“pencil beam cuboid from which we will cut the vuvuzela.
Why a vuvuzela?
neutral hydrogen (HI)nemits photons at a very specific frequency (around 21cm in wavelength, a result of a hyperfine transition that flips the spin of an electron relative to the proton in hydrogen). as one moves further away form earth, the photons become redshifted due to the cosmological expansion of space. when we observe HI in distant galaxies, the HI photons have been redshifted to longer wavelengths
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