------------------------------------------------------------------------
From: Michael.Nord@nrl.navy.mil
To: gcnews@zia.aoc.nrao.edu
Subject: submit 6cmntfs.tex ApJ, 2004, accepted


%astro-ph/0402061
\documentclass{emulateapj}

%
%
\newcommand{\mjybm}{\mbox{mJy~beam${}^{-1}$}}

\shortauthors{LaRosa et al.}
\shorttitle{6~cm study of NTFs}
\begin{document}
%Astrophysical Journal, Accepted

\title{New Nonthermal Filaments at the Galactic Center: Are They Tracing a 
Globally Ordered Magnetic Field?}

\author{T.~N.~LaRosa}
\affil{Department of Biological \& Physical Sciences,
 Kennesaw State University, 1000 Chastain Rd., Kennesaw, GA  30144}
\email{ted@avatar.kennesaw.edu}

\author{Michael~E.~Nord}
\affil{Department of Physics and Astronomy, University of New Mexico, 
Albuquerque \& Remote Sensing Division, Naval Research Laboratory,
Washington DC 20375-5351}
\email{Michael.Nord@nrl.navy.mil}

\author{T.~Joseph~W.~Lazio \& Namir~E.~Kassim}
\affil{Remote Sensing Division, Naval Research Laboratory,
Washington DC 20375-5351}
\email{Joseph.Lazio@nrl.navy.mil}
\email{Namir.Kassim@nrl.navy.mil}

\begin{abstract}
New high-resolution, wide-field 90~cm VLA\footnote{%
The National Radio Astronomy Observatory (NRAO) is a facility of the
National Science Foundation operated under a cooperative agreement by
Associated Universities, Inc.}
observations of the Galactic Center region by Nord et al.\ have
revealed twenty nonthermal filament (NTF) candidates.  We report 6~cm
polarization observations of six of these.  All of the candidates have
the expected NTF morphology, and two show extended polarization confirming
their identification as NTFs.  One of the new NTFs appears to be part
of a system of NTFs located in the \objectname[]{Sgr~B} region, 64~pc
in projection north of \objectname[]{Sgr~A}. These filaments cross the
Galactic plane with an orientation similar to the filaments in the
Galactic Center Radio Arc.  They extend the scale over which the NTF
phenomena is known to occur to almost 300~pc along the Galactic
plane. Another NTF was found in the Galactic plane south
of the \objectname[]{Sgr~C} filament but with an orientation
of~45\arcdeg\ to the Galactic plane.  This is only the second of~12
confirmed NTFs that is not oriented perpendicular to the
Galactic plane.  An additional candidate in the Sgr~C region was resolved
into multiple filamentary structures.  Polarization was detected only at 
the brightness peak of one of the filaments.  Several of these filaments 
run parallel to the Galactic plane and can be considered additional 
evidence for non-poloidal magnetic fields at the GC. Together the 90
and~6~cm observations indicate that the Galactic center magnetic field
may be more complex than a simple globally ordered dipole field.

\end{abstract}

\keywords {ISM:Galactic Center --- radio continuum}