Cas A spectra cross-correlated for Cα RRLs with a template spectrum across a range of redshifts. The plot on the left shows the spectral cross-correlation value at each redshift. The outlying peak at the redshift (z = −0.000158) of the −47 km s−1 component is again clearly visible. The histogram on the right shows the binned distribution of cross-correlation values. Cas A α-transition stacking demonstrates our method in a regime with a high signal-to-noise ratio.
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