Interlocking Resonance Patterns in Galaxy Disks
arXiv:1310.3415 · doi:10.1088/0067-0049/210/1/2
Abstract
We have developed a method for finding dynamical resonances in disk galaxies using the change in sense of the radial component of the in-plane velocity at a resonance radius. Using simulations we show that we would expect to find these changes at corotation radii, with a weaker effect at the ILR and a small effect at the OLR. The method works well with observations at high spectral and angular resolutions, and is suited to the analysis of 2D velocity fields in Ha from Fabry-Perot spectroscopy, (though it is also applicable to fields in 21cm emission from HI, or to CO emission lines). The observations are mainly from the GHASP spectrometer data base, taken on the 1.93m telescope at Haute Provence, plus some data from the GHaFaS spectrometer on the 4.2m WHT at La Palma. We find clear indications of resonance effects in the disk velocity fields of virtually all of the 104 galaxies. The number of resonance radii detected ranges from one to seven, with a median of four. We have derived the resonance curves: Omega, Omega+/-kappa/2, Omega+/-kappa/4 against radius for all the galaxies, and used them to derive the ILR, the OLR, and the two 4:1 resonances for each corotation in each galaxy. This led us to discover a pattern in over 70% of the sample: given two pattern speeds, say Omega1 and Omega2, the OLR of Omega1 coincides with the corotation of Omega2, and the inner 4:1 resonance of Omega2 coincides with the corotation of Omega1. Although the second coincidence has been predicted, a prediction of this double coincidence is not found in the literature. This pattern is found once in 42 of the galaxies, twice in a further 26, three times in five, and even four times in one galaxy. We also compute the ratio of corotation radius to bar length where we have good enough image quality, finding a mean value of 1.3, and a shallow increase towards later type galaxies.
Accepted for publication in ApJ Suppl. 10 figures on the text plus extra figures available online only in the ApJ Suppl. version
References in corpus (12)
- A Near-Infrared Study of 2MASS Bars in Local Galaxies: An Anchor for High Redshift Studies
- The Outer Disks of Early-Type Galaxies. I. Surface-Brightness Profiles of Barred Galaxies
- GHASP : An Halpha kinematic survey of spiral and irregular galaxies - VI. New Halpha data cubes for 108 galaxies
- Model-based pattern speed estimates for 38 barred galaxies
- Radial Dependence of the Pattern Speed of M51
- Long-Lived Double-Barred Galaxies From Pseudo-Bulges
- Molecular Gas in NUclei of GAlaxies (NUGA). X. The Seyfert 2 galaxy NGC 3147
- Tests of the Radial Tremaine-Weinberg Method
- Observable Properties of Double-Barred Galaxies in N-Body Simulations
- Nuclear starburst-driven evolution of the central region in NGC 6764
- Comparison of bar strengths in optical and near-infrared for the OSUBSGS sample
- Comparison between 2-D and 3-D codes in dynamical simulations of gas flow in barred galaxies
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