New observations of NGC 520

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Astronomical Photography, Galactic Evolution, Galactic Rotation, Galaxies, Astronomical Catalogs, Center Of Mass, Radial Velocity, Spectroscopic Analysis, Star Distribution, Stellar Motions, Stellar Spectra, Velocity Distribution

Scientific paper

NGC 520 has been considered by some to be a single exploding galaxy and by others to be a pair of galaxies undergoing a close tidal interaction. This paper presents new spectroscopic and photographic observations relevant to the interpretation of the system. The velocity field is consistent with a geometry of two almost superposed disks, both viewed nearly edge-on and rotating so that their northwesterly ends approach us relative to the center of mass. A new deep photograph shows a hitherto undetected faint, long plume or tail. Although not conclusive, both observations seem to favor the hypothesis that in NGC 520 one is viewing two galaxies in close tidal interaction.

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