On the Physical Conditions in AGN Optical Jets

Details On the Physical Conditions in AGN Optical Jets On the Physical Conditions in AGN Optical Jets

1999-10-22

arxiv.org/abs/astro-ph/9910417v2

New Astron.Rev. 46 (2002) 405-409

Astronomy and Astrophysics

Astrophysics

To appear in the proceeding of "Lifecycle of Radio Galaxies" symposium, New Astronomy Review, in press Typos corrected. In par

Scientific paper

10.1016/S1387-6473(02)00151-3

The energy budget of all known optical jets is discussed. It is found that to power the extended radio lobes of radio galaxies, the jet bulk motion on kpc scales must be relativistic, on average. Based on various constraints, a ``most probable'' region centered around bulk Lorentz factor ~7.5 and jet inclination \~20 degrees is found. Because of the consequent relativistic beaming, the rest frame magnetic field is lower and electron lifetimes longer. Combining the effects of time dilation and lower emission rate, the electron diffusion length becomes fully consistent with the deprojected jet length, without the need for reacceleration.

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