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K correction

(correction to magnitude for redshift)

K correction is a correction to the magnitude of a distant object to adjust for its redshift, i.e., to give the magnitude it would have if it had no radial velocity, e.g., due to expanding space. There is no correction required in the magnitude of its bolometric magnitude nor of the magnitude of a single spectral line, but given observation in a particular band, a correction is required. For example, the peak in the spectral energy distribution might normally be within the band, but the Doppler shift moved it outside the band.

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