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**Session 40 - Radiogalaxies & Jets.**

*Display session, Tuesday, January 14*

*Metropolitan Ballroom, *

## [40.07] Radio Jet to Counterjet Flux Ratios Incorporating General Relativistic Effects

*G. Bao, P. J. Wiita (GSU)*
We present a general relativistic formula for the flux
density ratio of a nuclear jet to its counterjet. The key
general relativistic effect, i.e., light bending by the
black hole, favors the visibility of the counterjet. The
formula is significantly different from the one considering
only Doppler effects when the angle between an line of sight
and the jet, i, is small, say i< 10^\circ. Gravitational
lensing plays a vital role if i\sim 1^\circ though
the probability of this effect dominating is small. It
is possible for a counterjet to be visible even if the
jet has a high value of Lorentz factor, \gamma. Lensed
counterjets will only be visible for subluminal sources.

We apply the more general formula to the recently
observed counterjet in NGC 1275 and show that the value
of i is slightly smaller than when derived by the
traditional formula. For reasonable assumptions about
other parameters we set limits on the viewing angle of
i > 16^\circ, and on the spectral index of
\alpha < 1.6.

The author(s) of this abstract have provided an email address for comments about the abstract: bao@chara.gsu.edu

**Program
listing for Tuesday**