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Arp194 is a system of recently collided galaxies, where the southern galaxy(S) passed through the gaseous disc of the northern galaxy (N) which in turnconsists of two close components. This system is of special interest due to thepresence of regions of active star-formation in the bridge between galaxies,the brightest of which (the region A) has a size of at least 4 kpc. We obtainedthree spectral slices of the system for different slit positions at the 6-mtelescope of SAO RAS. We estimated the radial distribution of line-of-sightvelocity and velocity dispersion as well as the intensities of emission linesand oxygen abundance $12+\log(\mathrm{O/H})$. The gas in the bridge is onlypartially mixed chemically and spatially: we observe the O/H gradient with thegalactocentric distances both from S and N galaxies and a high dispersion ofO/H in the outskirts of N-galaxy. Velocity dispersion of the emission-line gasis the lowest in the star-forming sites of the bridge and exceeds 50-70 km/s inthe disturbed region of N-galaxy. Based on the SDSS photometrical data and ourkinematical profiles we measured the masses of stellar population and thedynamical masses of individual objects. We confirm that the region A is thegravitationally bound tidal dwarf with the age of $10^7 - 10^8 $ yr, which isfalling onto the parent S- galaxy. There is no evidence of the significantamount of dark matter in this dwarf galaxy.

Tidal bridge and tidal dwarf candidates in the interacting system Arp194