Formation of the spiral structure in SB galaxies |
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| Authors: | V L Polyachenko E V Polyachenko |
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| Institution: | (1) Institute of Astronomy, Russian Academy of Sciences, Pyatnitskaya ul. 48, Moscow, 109017, Russia |
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| Abstract: | We investigate regions near the ends of the principal spiral arms in SB galaxies, where the non-axially symmetric part of the gravitational potential rapidly transforms to its asymptotic quadrupole form. The galactic disk responds to this transformation of the potential by forming nearly circular spirals with an angular extent of the order of π/2 (quarter-turn spirals). We consider the resonance mechanism for the formation of principal spirals. Expressions are derived for the resonance responses of disks with circular and nearly circular stellar orbits. |
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| Keywords: | galaxies intergalactic gas |
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