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Paper: The Duality of Spiral Structure, and a Quantitative Dust Penetrated Morphological Tuning Fork at Low and High Redshift
Volume: 230, Galaxy Disks and Disk Galaxies
Page: 137
Authors: Block, D. L.; Puerari, I.; Buta, R. J.; Abraham, R.; Takamiya, M.; Stockton, A.
Abstract: In the near-infrared, the morphology of older star-dominated disks indicates a simple classification scheme (1) Hm where m is the dominant harmonic, (2) a pitch angle (derived from the Fourier spectra) associated with the rate of shear A/ω in the stellar disk and (3) a `bar strength' parameter, robustly derived from the gravitational potential or torque of the bar. A spiral galaxy may present two radically different morphologies in the optical and near-infrared regime; there is no correlation between our quantitative dust penetrated tuning fork and that of Hubble. Applications of our z~0 Fourier template to the HDF are discussed using L and M band simulations from an 8-m NGST; the rest-wavelength IR morphology of high-z galaxies should probably be a key factor in deciding the final choice of instruments for the NGST.
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