BL Lac 天体的多波段性质和γ辐射

With the support of grant (19973001), we have done opticalobservations from selected blazers, based on which and the data from literatures,the long/short-term variability properties have beendiscussed. Binary black holemodel is used to explain the long-term variation periodicity determined for thosewith plant of observational data and long coverage of observation period. Thebrightness dependently spectral property and the time lag between differentwavelengths are also investigated. For gamma-ray emissin mechanism, wemainly concentrated on the correlation between gamma-ray emissions and theradio and the broad line emissions and found that our results favour SSC model.Based on the gamma-ray variability time scale and the gamma-ray luminosity,.the central black hole masses are estimated. Frequency-dependent Doppler factorrelation is expanded to gamma-ray band using the multiwavelength data..Relation between polarization and optical variation and core-dominanceparameter are derived and used to explain the observational results. Based on thepolariztion and Doppler factor, we found that a ratio of the de-beamed to the.unbeamed flux densities in BLs is different than that in OVVs, which maybe.explain why there are strong emission lines in OVVs but in BLs.

通过观测、整理BLLac天体的多波段同时或准同时的观测资料，对多波段资料用我们提出的椒ń行拚芯?r 波段与低能波段之间的关系。用已有理论对修正后的观测资料进行拟合，研究r 射线光深与辐射角、辐射区域大小的关系，确定AGN的基本参量，对已有的r 射线机制进行限制，并把它推广到其它AGN，建立AGN的辐射机制及新统一模型。