Résumé :
Superthin galaxies are bulgeless, late-type spiral galaxies seen edge-
on. HI synthesis observations probe the kinematic structure of their
interstellar medium. I shall present the results of high-sensitivity
VLA observations of UGC7321, IC2233, UGC3697 and UGC10043. Two of
these galaxies are rather isolated while the other two are the
dominant members of small groups.
We have detected a pattern of "corrugations" in IC 2233, the first
such detection in neutral Hydrogen in an external galaxy. UGC 3697,
the "Integral Sign" galaxy shows a spectacular S-shaped bending that
has been triggered by the passage of an intruder through its disk.
UGC 10043, not quite a superthin galaxy, has presented us with an
unexpected, rich interaction with a previously unknown companion which
is reminiscent of the M51 system (the Whirlpool galaxy) "seen from the
side."
