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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:The kinematics of the Sagittarius (R = 5.7 kpc),Carina (R = 6.5 kpc), Cygnus (R = 6.8 kpc), and Perseus (R = 8.2 kpc) arms suggests the existence of two spiral patterns in the Galaxy that rotate with different speeds. The inner spiral pattern that is represented by the Sagittarius arm rotates with the speed of the bar, b = 60 ± 5 km s-1 kpc-1, while the outer spiral pattern that includes the Carina, Cygnus, and Perseus arms rotates with a lower speed, s = 12 22 km s-1 kpc-1.The existence of an outer slow tightly wound spiral pattern and an inner fast spiral pattern can be explained by numerically simulating the dynamics of outer pseudorings. The outer Lindblad resonance of the bar must be located between the Sagittarius and Carina arms. The Cygnus arm appears as a connecting link between the fast and slow spiral patterns