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Abstract for an Oral Presentation at the ATNF/AAO Joint Symposium

Author :
John Dickey, ATNF

Title :
Measuring the Distance to the Galactic Polarized Continuum using 21-cm Absorptio
n

Abstract :
Using the Compact Array in 210m and 750m configurations, I have detected
the polarized component of the Galactic synchrotron background radiation at
18 and 21 cm wavelength in the region of strong linear polarization at
(l,b) = (326 - 333, 0 - +3) studied by Duncan et al. (1997). At 21cm the
HI line can be seen in absorption toward the Stokes q and u components of
the emission at velocities from 0 km/s up to about -40 km/s (LSR). This
indictes that the polarized component of the non-thermal Galactic background
must originate at least in part from distances greater than 2 kpc from the
sun.