We present a morphological and structural analysis of the Richness zero cluster ABCG 194 , known as a “ linear cluster ” .
This study is based on a catalogue of 97 galaxies with B magnitudes and redshifts belonging to the cluster , a ROSAT PSPC image and radio data .

We show that the overall large scale structure is rather smooth and comparable at optical and X-ray wavelengths .
The cluster is elongated along PA \approx 50 ; however it appears as “ linear ” when taking into account only galaxies in the very central part ( the axial ratio varies from 0.2 in the central region to 0.8 for a larger region ) .
We have obtained the galaxy density profile and despite the very low X-ray emission the X-ray emitting gas density profile .
We have estimated the X-ray gas and dynamical masses up to the limiting radius R _ { \mathrm { L } } of the PSPC image ( respectively 9 10 ^ { 12 } and 8 10 ^ { 13 } M _ { \odot } ) and the stellar mass up to R _ { \mathrm { L } } and to 3 Mpc ( 3 10 ^ { 12 } and 7.5 10 ^ { 12 } M _ { \odot } ) .

At smaller scales , the analysis of both positions and velocities reveals the existence of several groups but which are not strongly linked dynamically ; however a main structure with a nearly gaussian velocity distribution is exhibited .
The velocity dispersion is small ( \sigma _ { los } = 360 km s ^ { -1 } ) .
A wavelet analysis of the X-ray image reveals no large scale substructures .
Small scale X-ray sources are detected , mainly corresponding to individual galaxies ; we give an estimate of their luminosities .
The lack of strong substructuring suggests that ABCG 194 is overall a relaxed cluster .

ABCG 194 is a poor and cold cluster ; we compare how its characteristics fit into various correlations found in the literature , but generally for richer/hotter clusters , such as the \sigma -T _ { \mathrm { X } } , L _ { \mathrm { X } } -T _ { \mathrm { X } } , L _ { \mathrm { X } } - \sigma relations or the ratios of various kinds of masses .