Volume 391, Number 3, September I 2002
|Page(s)||917 - 922|
|Section||Cosmology (including clusters of galaxies)|
|Published online||09 August 2002|
Radio luminosities and classificatory criteria of BL Lacertae objects
Department of Physics, Yunnan University, Kunming 650091, PR China
Corresponding author: D. C. Mei, firstname.lastname@example.org
Accepted: 26 June 2002
Using the sample of radio-selected BL Lacertae objects (RBLs) and X-ray selected BL Lacertae objects (XBLs) presented by Sambruna et al. ([CITE]), 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 () and peak frequencies (). Our results are as follows: (i) there is a positive correlation between radio luminosity Lr and and a negative correlation between Lr and . 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 (erg/s) and (or )0.75 for – plot and those of (erg/s) and for the – plot; (ii) there is a weak positive correlation between optical luminosity Lo and and a negative weak correlation between and ; (iii) there is no correlation between X-ray luminosity Lx and or between Lx and . 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.
Key words: galaxies: BL Lacertae objects: general / galaxies: fundamental parameters / radiation mechanism: non–thermal
© ESO, 2002
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