The connection between black hole mass and Doppler boosted emission in BL Lacertae type objects

We investigate the relationship between black holemass (MBH) and Doppler boosted emission for BL Lacertaetype objects (BL Lacs) detected in the SDSS and FIRST surveys. The synthesis of stellar populationand bidimensionaldecomposition methods allows us to disentangle the components of the host galaxy from that of the nuclear black holein their optical spectra and images, respectively. We derive estimates of black holemasses via stellar velocity dispersion and bulge luminosity. We find that masses delivered by both methods are consistent within errors. There is no difference between the black holemass ranges for high-synchrotron peaked BL Lacs (HBL) and low-synchrotron peaked BL Lacs (LBL). A correlation between the black-holemass and radio, optical and X-ray luminosity has been found at a high significance level. The optical-continuum emission correlates with the jet luminosity as well. Besides, X-ray and radio emission are correlated when HBLs and LBLs are considered separately. Results presented in this work: (i) show that the black holemass does not decide the SED shapes of BL Lacs, (ii) confirm that X-ray and optical emission is associated to the relativistic jet, and (iii) present evidence of a relation between MBH and Doppler boosted emission, which among BL Lacs may be understood as a close relation between faster jets and more massive black holes.