% TEX version of NRAO Radio CD-ROM image submission form 
% Version 91/3/28    J. J. Condon

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\centerline{\bf NRAO CD-ROM IMAGE SUBMISSION FORM}

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\noindent Image Donor(s): Greg Taylor, Rick Perley

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\noindent Contact donor: Greg Taylor

Mailing address: NRAO, Socorro

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Telephone: 505 835 7458

E-mail address: gtaylor

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\noindent Source or Image Name: Hydra A

\noindent Alternate Names: 3C 218, 0915-11, Abell 780 

\noindent Description of Observation: (e.g., date of observation,
telescope(s) used, frequencies, polarization type, resolution, 
deconvolution method) 

This 4635 MHz (6 cm) total intensity image was made from observations
with the VLA in the A, B, C, and D configurations between October 8,
1987 and January 11, 1989.  The resolution of this ``cleaned''
image is 0.6''.  

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\noindent Description of Image: (e.g., type of source, scientific reason
for observing, notable source features)

Hydra A is one of the most prominent extragalactic radio sources.  
It also happens to be one of the relatively few radio galaxies to 
exhibit very high Faraday rotation measures (up to 12000 radians
m$^{-2}$).  This image was obtained as part of a detailed 
multiconfiguration, multifrequency program to determine the 
rotation measure structure.   
The radio emission of Hydra A consists of two components: (1) a pair
of well-collimated, curved jets possessing ``S'' symmetry, each of
which makes a turn through $\sim$40$^\circ$ between the core and 
the lobe, and (2) diffuse radio lobes, also rotation-symmetric,
although straighter.   \par

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\noindent Publication Reference(s): Taylor, G. B., Perley, R. A., 
Inoue, M., Kato, T., Tabara, H. and Aizu, K. 1990, {\it Ap. J.},
{\bf 360}, 41. and Taylor, G. B. 1991, Ph. D. thesis, University
of California, Los Angeles. \par

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\noindent Permission is granted to NRAO/AUI to use, distribute, sell, reproduce
or authorize others to use, distribute, sell or reproduce the
images listed above without reservation or restriction.  The donor
whose signature appears below agrees to inform all co-authors of this
release.

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\noindent Signed:

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\noindent Date: 5/30/91

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