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19952000
most citedThe Variability of Quasars. II. Frequency Dependence

112 citations · 113 across the 3 of their papers we have counts for

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astro-ph2000

Was the Whirlpool (M51) a Spiral Galaxy before the Encounter with the Companion NGC 5195?

F. Natali, L. Di Fino, G. Natali

Using the B-I color index in the radial photometry of M51, applied to defined azimuthal sectors, we reveals asymmetries in the shape of the density pattern of the galactic arms. Th…