Abstract
THE question of whether or not the small excess redshifts observed in some companion galaxies1,2 have a non-velocity origin has recently been raised. The de Vaucouleurs3 have pointed out that small, systematic errors in the redshifts of E and SO galaxies might arise because the lines in the low dispersion spectra on which they are measured do not have well-determined effective wavelengths. The data reported here support this possibility. In the three cases I present, systematic differences arise between velocities derived from measurements of CA II, H(λ3968.5) and K(λ3933.7) carried out “classically” (with a visually positioned, two coordinate measuring engine) and velocities derived from either “classical” measurements of other spectral lines in the same object or measurements of the same H and K lines using numerical techniques.
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SIMKIN, S. Small “Non-velocity” Redshifts in Galaxies. Nature 239, 43–44 (1972). https://doi.org/10.1038/239043a0
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DOI: https://doi.org/10.1038/239043a0
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