'Missing Mass' Found in Recycled Dwarf Galaxies

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Left: Composite radioopticalultraviolet image of NGC 5291 and its surroundings including the debris propelled outward by collision with another galaxy. Blue is atomic Hydrogen observed with the VLA white is optical red is ultraviolet (Galex satellite ...
Left: Composite radio/optical/ultraviolet image of NGC 5291 and its surroundings, including the debris propelled outward by collision with another galaxy. Blue is atomic Hydrogen observed with the VLA; white is optical; red is ultraviolet (Galex satellite). Red labels mark the dwarf galaxies studied in this research. Right: Detail of image produced by computer simulation of the galactic collision, showing debris ring and condensations that became star-forming dwarf galaxies. CREDIT: P-A Duc, CEA-CNRS/NRAO/AUI/NSF/NASA

Astronomers studying dwarf galaxies formed from the debris of a collision of larger galaxies found the dwarfs much more massive than expected, and think the additional material is "missing mass" that theorists said should not be present in this kind of dwarf galaxy.


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