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\begin{document}
\title{HUBBLE SPACE TELESCOPE IMAGING OF COMPACT\\
~\\
STEEP SPECTRUM RADIO SOURCES}
\author{W.~H.\ de Vries,\thanks{Also Kapteyn Astronomical Institute, 
P.O.\ Box 800, NL-9700 AV, Groningen, The Netherlands}
        C.~P.\ O'Dea,
        S.~A.\ Baum,
        W.~B.\ Sparks,
        J.~Biretta,\\
\centerline{\it
        S.~de~Koff,\thanks{Leiden Observatory, P.O.\ Box 9513, NL-2300 RA, 
Leiden, The Netherlands}
        D.~Golombek}\\
\\
Space Telescope Science Institute\\
\\
3700 San Martin Drive, Baltimore, MD 21218\\
\and
        M.~D.\ Lehnert\\
\\
Leiden Observatory\\
\\
P.O.\ Box 9513, NL-2300 RA, Leiden, The Netherlands\\
\and
        F.~Macchetto\\
\\
Space Telescope Science Institute\\
\and
        P.~McCarthy\\
\\
Observatories of The Carnegie Institution\\
\\
813 Santa Barbara Street, Pasadena, CA 91101\\
\and
        G.~K.\ Miley\\
\\
Leiden Observatory}

\tobe{June 1997}{ApJS}
\recacc{16 August 1996}{30 December 1996}
\maketitle
 
\abstract{ 
We present  {\sl Hubble Space Telescope\/} WFPC2 images taken in a broad
red filter (F702W) of 30~3CR  Compact Steep Spectrum (CSS) radio
sources.  We overlayed radio maps taken from the literature on the
optical images, to determine the radio--optical alignment and to
study detailed correspondence. All CSS sources for which the relative
orientation between the optical and radio can be measured, display 
good alignment between the optical and radio emission down to the
lowest redshift in the sample of $z\sim 0.1$. The existence of the
alignment effect at this relatively low redshift is in contrast to the
large scale 3CR radio sources, which tend to show a significant
alignment only at $z> 0.6$ (cf.\ McCarthy \etal 1987,1995; Chambers
\etal 1987; de~Koff \etal 1996). We find candidates for optical
synchrotron hotspots in 3C~213.1 and 3C~380 and an optical jet in
3C~346. These results are discussed in more detail in Paper~II (De~Vries 
\etal 1996).  }