Cosmological implications of BL Lac objects

It has become clear in recent years that relativistic beaming is a good explanation for the BL Lac phenomenon. Of studies based on the relativistic beaming model of BL Lac objects, we note that the orientation of jet's axis to the line-of-sight is very small and, therefore, the observed flux emitted from a rapidly moving source is orders of magnitude higher than the flux in its rest-frame:F_obs = ^{3 +} F_intr, where is the bulk relativistic Doppler factor. Then the observed apparent magnitudem_v must be corrected for this effect. For our 39 samples, the corrected apparent magnitudem_v^corr and logZ have a good correlation.