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		| Paper: | 
		A helical-Jet Model for MKN 501 | 
	 
	
		| Volume: | 
		159, BL Lac Phenomenon | 
	 
	
		| Page: | 
		489 | 
	 
	
		| Authors: | 
		Villata, M.; Raiteri, C. M. | 
	 
	
	
		| Abstract: | 
		We present a geometrical model for the interpretation of the Mkn 501 spectral energy distribution (SED) variations. It is shown how a helical jet with a steady emission can explain the SEDs constructed with simultaneous data taken when the source was in different brightness states: in particular, it can account fairly well for the exceptionally high X-ray luminosity state recently detected by the BeppoSAX satellite. | 
	 
	
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