bullet dwarfとは 意味・読み方・使い方

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• bullet dwarf galaxy

名詞

bullet dwarf (plural bullet dwarfs)

1. (astronomy) An ultradiffuse galaxy and dwarf galaxy with little or no dark matter, but with young very luminous globular clusters, about the same age as most of the stars in the galaxy.
   1. An ultradiffuse dwarf galaxy that resulted from the collisions of two dwarf galaxies, where the stars, gas, and, dust, collide, bind, and shocked together, creating a new single dwarf galaxy and starburst, while the companion dark matter haloes continue onward on their former paths, separating from the now singular galaxy.
   2. Any of a series of ultradiffuse dwarfs lined up on the path of the two dark matter haloes after collision, the remnants of the collision of two, perhaps not dwarf, galaxies, falling behind due to matter shockwave interactions the dark matter did not experience.

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