Based on a large Fermi blazar sample, the blazar sequence (synchrotron peak frequency $\nu_{ \rm peak}$ versus synchrotron peak luminosity $L_{ \rm peak}$) is revisited. It is found that there is significant anti-correlation between $\nu_{ \rm peak}$ and $L_{ \rm peak}$ for blazars. However, after being Doppler corrected, the anti-correlation disappears. The jet cavity power ($P_{ \rm jet}$) is estimated from extended radio luminosity. So it is free of beaming effect. We find that there are significant anti-correlations between $P_{ \rm jet}$ and beam-corrected $\nu_{ \rm peak}^{ '}$ for both blazars and radio galaxies, which supports the blazar sequence and unification of blazars and radio galaxies (an alternative relationship is the correlation between jet power and $\gamma$-ray photon index).
Categories: astro-ph.HE