Block, D L; Puerari, I; Fazio, G. G.; Stockton, A; Canalizo, G; Freeman, Kenneth; Jarrett, Thomas H; Combes, F; Groess, R; Worthey, G; Gehrz, R. D.; Woodward, Chick E; Polomski, E. F.
The Triangulum Spiral Galaxy Messier 33 offers unique insights into the building of a galactic disk. We identify spectacular arcs of intermediate age (0.6 Gyr - 2 Gyr) stars in the low-metallicity outer disk. The northern arc spans ∼120 degrees in azimu
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