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Widely known for his work on Cepheid variables, peculiar galaxies, and the extragalactic distance scale, Barry Madore divides his time between directing science for NED, the NASA/IPAC Extragalactic Database, and research at the Observatories, where he is resolving discrepancies between observations of galaxies at different wavelengths, with what is really happening during galactic evolution. Distant galaxies appear to be more ragged and disorganized than closer ones. These appearances could be legitimate features, or effects from the expansion of the universe, which progressively shifts ultraviolet photons from distant galaxies into the range sensed by the optical detectors. Madore is tackling this problem through observations and computer modeling.
To see how the perceived morphology changes with wavelength, Madore and Carnegie's Wendy Freedman acquired images of galaxies with the Ultraviolet Imaging Telescope and compared them with images taken at Las Campanas at optical and near-infrared wavelengths. Even the basic underlying morphology was transformed by the particular wavelength used. Rings and bulges, bars and asymmetries come and go depending on use of UV or red wavelenghts. Dust, too, plays a significant role in detection as it scatters and absorbs light.
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ASTROPHYSICAL JOURNALno. 1 (2024): 132
ASTROPHYSICAL JOURNALno. 1 (2024): 83
arxiv(2023)
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arXiv (Cornell University) (2023)
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JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICSno. 11 (2023): 050-050
ASTRONOMICAL JOURNALno. 1 (2023): 2-2
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