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- W2037123370 abstract "A selected subset of BL Lac objects were monitored with VLBI techniques at multifrequencies. Apparent superluminal motion and X-rays were detected in all of the monitored sources. From the observational data, kinematic parameters, geometric parameters and beaming effects for the ‘core’ of the selected BL Lac objects have been estimated. Our results indicate that some BL Lacs have large Lorentz factors and small viewing angles; relativistic beaming effects are strongly present in these sources. On the other hand, some BL Lacs have small Lorentz factors; their viewing angles are quite large. It does not seem possible to avoid the fact that some BL Lac objects are not oriented particularly close to the line of sight. It conflicts with the basic assumption of the accepted theories for explaining the characteristics of BL Lac objects at present. Also, it seems that the BL Lac objects in the class I of the Burdige and Hewitt's classification have larger viewing angles than those int he class II. The whole BL Lac classification could be a misnomer: the sources classified as ‘BL Lac objects’ are a mixture of physically different populations with different parent objects." @default.
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- W2037123370 date "1996-01-01" @default.
- W2037123370 modified "2023-09-24" @default.
- W2037123370 title "Viewing angles in some selected BL Lac objects" @default.
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- W2037123370 doi "https://doi.org/10.1007/bf00644440" @default.
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