Constraining the Parameters of AGN Jets - Comparisons with Herbig-Haro Jets

Abstract

Comparing the properties AGN and Herbig-Haro jets can be a useful exercise for understanding the physical mechanisms at work in collimated outflows that propagate in such different environments. In the case of Herbig-Haro jets, the presence of emission lines in the spectra and the continuous evolution of the observation techniques greatly favor our knowledge of the physical parameters of the jets instead, for AGN jets, the process of constraining the jet parameters is hampered by the nature of the emission from these objects that is non-thermal. I will discuss how one cannot directly constrain the basic parameters of extragalactic jets by observations but must treat and interpret the data either by statistical means or by comparing observed and simulated morphologies in order to gain some indications on the values of these parameters.

12 pages, 8 postscript figures. Review talk at WS-JETS "Jets 2002: Theory and Observations in YSOs", JENAM September 2002, Porto (Portugal)

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