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Density Wave Resonances in Spiral Galaxies

Honor Student Density Wave Resonances in Spiral Galaxies

Department: Physics and Engineering
Symposium Year: 2013
Student(s): Eric S. Linares
Faculty Mentor(s): Dr. Jason C. Speights

Wave resonances that are predicted by spiral density wave theory are identified by interpreting symmetry features in the neutral hydrogen (HI) intensity maps of 12 galaxies. This is important for determining whether such resonances are easily identifiable in the HI, with the ultimate goal of testing the plausibility of density waves in galactic disks. Evidence for 2nd, 3rd, and 4th order symmetries are searched for by first subtracting successive rotations of the HI data maps from the original maps, and then fitting Fourier amplitudes and phases to the results. Many of the results show clear signatures of symmetries, suggestive of the superposition of wave modes.

 

 

 

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