Involved people at OAB: Ciliegi, Zamorani.
In January 1999, in collaboration with G. Hasinger (AIP, Postdam),
a new deep radio survey a 6 cm in the Lockman Hole has been obtained.
The Lockman Field is one of the best studied areas of the sky at
all frequencies, from the radio up to the X-ray band.
These additional radio data nicely complement the multi--frequency
database in this region and allow to push to the faintest
possible limit the study of correlations between different bands.
The radio observations were carried out with the VLA at 5 GHz (6cm)
in the VLA C-configuration in January 1999 (33 hours).
A total of 62 sources at 
4.5 
level
(S
50 
Jy) has been detected. Using the already
available deep optical CCD data, 56 of the 62 radio sources (90% !)
have been optically identified. Using the V-I versus I-K
color
indices plot it has been found that the radio-to-optical ratio can be reasonably
used as a tool to discriminate between early-type
and late-type galaxies. The spectroscopic follow-up of these
sources is scheduled in May 2000 at the WHT.