SIMBAD references

Using the sample of radio-selected BL Lacertae objects (RBLs) and X-ray selected BL Lacertae objects (XBLs) presented by Sambruna et al. (1996ApJ...463..444S), we calculated the luminosities in radio, optical and X-ray of each source and made a statistical analysis among the luminosities at different wave-bands, broad-band spectral indices from radio to X-ray (α_rx) and peak frequencies (ν_p). Our results are as follows: (i) there is a positive correlation between radio luminosity L_r and α_rx and a negative correlation between L_r and ν_p. High-energy peak BL Lacs (HBLs) and low-energy peak BL Lacs (LBLs) can be distinguished very well; the dividing lines are probably those of logL_r=43.25(erg/s) and α_rx>(or ≤)0.75 for logL_r-α_rx plot and those of logL_r≤43.25(erg/s) and logν_p>14.7 for the logL_r-logν_p plot; (ii) there is a weak positive correlation between optical luminosity L_o and α_rx and a negative weak correlation between L_ o_ and ν_p; (iii) there is no correlation between X-ray luminosity L_x and α_rx or between L_x and ν_p. From our analysis, we find that synchrotron radiation is the main X-ray radiation mechanism for HBLs while inverse Compton scattering is dominant for LBLs.