Elliptical galaxies were usually known to be gas free, but in the past ten
years several surveys have been done using CCD subtraction techniques in
order to detect extended gaseous disks (Demoulin et al. 1984;
Kim 1989;
Buson et al. 1993;
Goudfrooij et al. 1994; Macchetto et al. 1996).
In the same way multi-phase Interstellar Medium (ISM) has been discovered in
early type galaxies:
- A hot component emitting in X-rays
(Forman
et al. 1985; Fabbiano et al. 1992),
- A cold component atomic gas (Knapp et al. 1985;
van Gorkom et al. 1986)
and molecular gas (Lees et al. 1991; Braine et al. 1994),
- A cold dust component, frequently detected but his role is not well
understood (Goudfrooij et al. 1994; Kim 1989).
The ionized gas is a good tracer of potential perturbation, it responds quickly to gravitational variation. It can be located in two preferred planes, one perpendicular to the shortest axis and the other one perpendicular to the longest axis (Tholine 1982; Heiligman et al. 1979). It has been shown that gaseous disks can be used to constrain the true shape of the ellipsoid (de Zeeuw & Franx 1989; Bertola et al. 1991). The 2D velocity field of ionized gas is an important tool to determine viewing angles and axis ratios from observational parameters. Table 1 (click here) shows us main characteristics of the galaxy sample. It consists in 11 elliptical and lenticular galaxies: there are nearby (the maximum redshift is 4800 km s-1) in order to have sufficient spatial resolution, there are field and cluster objects in order to see environment influence and all objects have been chosen to have a multiphase ISM (see Table 5 (click here)).
Name Coordinates (1950) Morphological Systemic 
Environment
Type (RSA/RC3) Velocity (km s-1)
NGC 404 
SO/SO -36 10.96 Isolated
NGC 708 
E2/E 4827 13.8 Cluster
NGC 1052 
E3/E4 1470 11.53 Companions
NGC 2974 
E4/E4 1924 11.68 Isolated
NGC 4546 
SB0 1050 11.3 Isolated
NGC 5846 
SO/E0 1709 11.1 Cluster
NGC 5866 
SO 769 10.8 Companions
NGC 5898 
SO/E0 2103 10.8 Companions
NGC 6868 
E3/E2 2876 11.6 Cluster
NGC 7014 
SO 4750 13.38 Companions
NGC 7332 
SO/L 1300 11.58 Companions