TitleThe Rotation of the Spiral Nebula Messier 33.
AuthorsMayall, N. U.; Aller, L. H.
AbstractThe investigation is based on radial velocity observations of 25 bright-line condensations well dis- tributed over the spiral (P1. I), and upon several long exposures that record the spectrum of the unre- solved nebulosity of the nuclear region. As preliminary steps in the derivation of the relation between rotational velocity and nuclear distance, the velocity of the system is found to be - 167 ± 5 km/sec from thre ...
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