We present the preliminary results of a deep ( 167 ks ) ROSAT HRI observation of the cD galaxy NGC1399 in the Fornax cluster .
We find , in agreement with previous observations , an extended ( 42-46 Kpc adopting a distance of 19 Mpc ) gaseous halo with a luminosity of L _ { X } = ( 4.41 \pm 0.04 ) \times 10 ^ { 41 } erg s ^ { -1 } .
The 5 arcsec resolution of the data allows us to detect a very complex and asymmetric structure of the halo with respect to the optical galaxy .
Moreover the analysis of the radial structure reveals the presence of a multi-component profile not consistent with a simple King model over the whole 40 Kpc .
We do not detect the presence of a central source and pose an upper limit to the luminosity of a possible active nucleus .

Due to the length of the observation , comparable to that of a deep survey , we detect a large number of sources within the HRI FOV , in slight excess with respect to the estimates based on previous surveys .
We study the flux distribution of the sources , their temporal behaviour and their spatial distribution with respect to the central galaxy .