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The Internal Ultraviolet-to-Optical Color Dispersion: Quantifying the Morphological K-Correction | | Casey Papovich
; Mauro Giavalisco
; Mark Dickinson
; Christopher J. Conselice
; Henry C. Ferguson
; | | Date: |
21 Aug 2003 | | Journal: | Astrophys.J. 598 (2003) 827-847 | | Subject: | astro-ph | | Affiliation: | Steward Obs.), Mauro Giavalisco (STScI), Mark Dickinson (STScI, JHU), Christopher J. Conselice (Caltech), Henry C. Ferguson (STScI, JHU | | Abstract: | We present a quantitative measure of the internal color dispersion within galaxies, which quantifies differences in morphology as a function of wavelength. We apply this statistic to a local galaxy sample with archival images at 1500 and 2500 Angstroms from the Ultraviolet Imaging Telescope, and ground-based B-band observations to investigate how the color dispersion relates to global galaxy properties. The intenal color dispersion generally correlates with transformations in galaxy morphology as a function of wavelength, i.e., it quantifies the morphological K-correction. Mid-type spiral galaxies exhibit the highest dispersion in their internal colors, which stems from differences in the bulge, disk, and spiral-arm components. Irregulars and late-type spirals show moderate internal color dispersion, which implies that young stars generally dominate the colors. Ellipticals, lenticulars, and early-type spirals generally have low or negligible internal color dispersion, which indicates that the stars contributing to the UV-to-optical emission have a very homogeneous distribution. We discuss the application of the internal color dispersion to high-redshift galaxies in deep, Hubble Space Telescope images. By simulating local galaxies at cosmological distances, many of the galaxies have luminosities that are sufficiently bright at rest--frame optical wavelengths to be detected within the limits of the currently deepest near-infrared surveys even with no evolution. Under assumptions that the luminosity and color evolution of the local galaxies conform with the measured values of high-redshift objects, we show that galaxies’ intrinsic internal color dispersion remains measurable out to z ~ 3. | | Source: | arXiv, astro-ph/0308386 | | Services: | Forum | Review | PDF | Favorites | |
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