Paired And Interacting Galaxies : International Astronomical Union Colloquium No. 124
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The luminosity of the ring system given in Table 1 is a lower limit to the total luminosity. However, the absolute magnitude of the rings must be increased by ~1 because of projection effects. The resulting M(HI)/L Bo ratio is then ~0 . 5 . This value is typical for late type spirals. Origin of Polar Rings The body of available data, i.e., the size of the rings, their luminosity, mean colors, value of M(HI)/L Bo , and presence of large-scale magntic fields (Hagen-Thorn , Popov, and Yakovleva, 1...979) lead to the conclusion that the system of rings is a spiral 236 galaxy. This conclusion is supported by the fact that luminous rings and dust lines crossing the NE-side of the main body have systematic shifts, which is usual for the arms of spiral galaxies. Therefore the apparent structure of NGC 2685 may be explained as a result of collision of normal SO and Sbc - Sc galaxies. 237 NGC 3808B The Sc galaxy NGC 3808B is a component of an interacting pair with NGC 3808A (W 300, Arp 87). It is located on the end of the spiral arm of NGC 3808A.
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