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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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