Paper:	On the Interaction in a Quartet of Galaxies
Volume:	505, Astronomical Surveys and Big Data
Page:	196
Authors:	Yeghiazaryan, A. A.; Hakobyan, A. A.; Nazaryan, T. A.
Abstract:	We performed Fabry-Perot scanning interferometry of the quartet of galaxies NGC 7769, 7770, 7771 and 7771A in the Hα line and studied their velocity fields. We found that the rotation curve of NGC 7769 is weakly distorted. The rotation curve of NGC 7771 is strongly distorted with the tidal arms caused by direct flyby of NGC 7769 and flyby of a smaller neighbor NGC 7770. The rotation curve of NGC 7770 is significantly skewed because of the interaction with the much more massive NGC 7771. The rotation curves and morphological disturbances suggest that the NGC 7769 and NGC 7771 have passed the first pericenter stage, however, probably the second encounter has not happened yet.

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