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		| Paper: | 
		Invisible Plasma Content in Blazars?—The Case of Markarian 421 | 
	 
	
		| Volume: | 
		402, Approaching Micro-Arcsecond Resolution with VSOP-2: Astrophysics and Technologies | 
	 
	
		| Page: | 
		303 | 
	 
	
		| Authors: | 
		Kino, M.; Takahara, M. | 
	 
	
	
		| Abstract: | 
		The invisible plasma content in blazar jets, such as protons and/or thermal electron-positron (e±) pairs, is explored through combined arguments of dynamical and radiative processes. By comparing the physical quantities required by the internal shock model with those obtained through the observed radio-to-gamma-ray spectra for Mrk 421, we infer a copious amount of invisible plasma in the jet. We speculate that the blazar sequence could arise from variations of total amount and/or blending ratio of e± pair and electron-proton plasma. | 
	 
	
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