Fig. 15.
Cumulative distributions of the velocity shifts of the C IV emission line (in units of km s−1) for our samples of red and control QSOs, matched in redshift and luminosity. These samples cover the redshift range 1.4 < z < 2.5, complementing the results presented using the [O III] lines at low redshift (z < 1). A significant enhancement of C IV velocity shifts is found for red QSOs as compared to control QSOs, which is consistent with our finding in Fig. 13.
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