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Analysis of resonances in grand design spiral galaxies

By Nelson Vera Villamizar, Horacio Alberto Dottori, Ivanio Puerari and Reinaldo Ramos de Carvalho


We have searched for corotation resonances (CRs) in three southern grand design spiral galaxies : NGC 1365, NGC 1566, and NGC 2997. We have also introduced a method of quantifying errors in the phase diagram used to detect CRs. We established the m=2 pattern CR at 12.1, 9.4, and 7 kpc for NGC 1365, NGC 1566, and NGC 2997, respectively. By using published rotation curves, we could determine spiral pattern angular speeds of 25.0, 12.2, and 17.6 km s-ˡ kpc-ˡ, respectively. A three-armed component has been detected in NGC 2997, with the CR placed at 8.7 kpc with a pattern angular speed ΩCR3=12.7 km s-ˡ kpc-ˡ. An m=1 component was detected in NGC 1566. We warily locate the CR at 7.1 kpc, with a pattern angular speed ΩCR −~16.6 km s-ˡ. This pattern does not present inner Lindblad resonance. Ages have been determined by studying the radial density profile of the m=2 Fourier components in g (newly formed stars) and i (perturbing spiral density wave supported by the disk of old stars), aided by the global aspect of the real spiral pattern in comparison with numerical simulations. The pattern is ~1200 Myr old in NGC 1365, ~800 Myr old in NGC 1566, and younger than 80 Myr in NGC 2997

Topics: Galaxies : individual (NGC 1365, NGC 1566, NGC 2997), Galaxias, Galaxies : kinematics and dynamics, Galaxies : spiral, Galaxies : structure, Methods: numerical
Year: 2015
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