your ID: 0197 
First Name: Robert 
Last Name: Zavala 
Affiliation: U.S. Naval Observatory 
Title: Helical Magnetic Fields in the jet of 3C 273 
Authors: R. T. Zavala & G. B. Taylor 
Topic: 3 
Session: oral 
Abstract: Using the VLBA we confirm the presence of a Faraday
 rotation measure gradient transverse to the jet axis of 3C 273. 
A rotation measure gradient is expected to be the signature of a 
helical magnetic field wrapping around the relativistic jet.