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Telescope Images Distant, Dim Dwarf Galaxies

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NEW HAVEN, Conn., July 11, 2014 — A ground-based telescope recently helped discover seven distant dwarf galaxies that could contain clues to the evolution of galaxies and even dark matter. The dwarf galaxies appear in the same region of the sky as galaxy M101, also known as the Pinwheel Galaxy, which is some 21 million light-years away from Earth. They have been overlooked by previous surveys because of their diffuse, low surface brightness (µ g ~ 25.5 to 27.5 mag arcsec-2), according to astronomers at Yale University. Yale astronomers used the Dragonfly Telephoto Array to detect the diffuse light of distant...Read full article

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    Published: July 2014
    Glossary
    astronomy
    The scientific observation of celestial radiation that has reached the vicinity of Earth, and the interpretation of these observations to determine the characteristics of the extraterrestrial bodies and phenomena that have emitted the radiation.
    scattering
    Change of the spatial distribution of a beam of radiation when it interacts with a surface or a heterogeneous medium, in which process there is no change of wavelength of the radiation.
    telephoto lens
    A compound lens so constructed that its overall length is equal to or less than its effective focal length.
    AmericasastronomyCoatingsConnecticutgalaxiesHubble Space TelescopeImaginglensesOpticsResearch & Technologyscatteringtelephoto lensUniversity of TorontoYale UniversityNew HavenM101Pinwheel GalaxyDragonfly Telephoto Arrayinternally scattered lightPieter van DokkumRoberto AbrahamAllison MerrittThe Astrophysical Journal Letters

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