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Paper: Was the Whirlpool (M51) a Spiral Galaxy before the Encounter with the Companion NGC 5195?
Volume: 230, Galaxy Disks and Disk Galaxies
Page: 475
Authors: Natali, F.; di Fino, L.; Natali, G.
Abstract: Using the B-I color index in the radial photometry of M51 we detect an asymmetric sawtooth-like shape in the density pattern of the galactic arms, similar to that produced by a progressive wave traveling in a preexisting spiral pattern. We suggest that M51 could be a spiral galaxy before the encounter with the companion.
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