All articles tagged with #cdg 2
Astronomers using the Hubble Space Telescope (with Euclid and Subaru) identified CDG-2 in the Perseus Cluster, a 300-million-light-year‑away galaxy that appears almost entirely devoid of stars; the object is estimated to be 99.9% dark matter, kept together by a halo and four globular clusters after nearby galaxies stripped away its star-forming material, making it a rare, near-pristine laboratory for studying dark matter.
A Canadian-led team using NASA’s Hubble, ESA’s Euclid and the Subaru Telescope has identified CDG-2, a candidate dark galaxy about 250 million light-years away that appears nearly invisible and is thought to be mostly dark matter, detected via a faint glow around four globular clusters. The galaxy is estimated to shine like only about 5 million stars, far fewer than the Milky Way, and researchers believe past interactions stripped away most of its stars—highlighting how indirect observations can reveal elusive cosmic structures and advance dark matter studies.
Astronomers have confirmed CDG-2, a faint galaxy in the Perseus cluster detected only through four globular clusters that provide about 16% of its light; by combining data from Hubble, Euclid, and Subaru, they estimate the galaxy’s total luminosity at roughly 6 million suns and a mass composed of 99.94%–99.98% dark matter, making it one of the most dark-matter–dominated galaxies and a valuable natural laboratory for studying dark matter and galaxy formation.
Astronomers using Hubble, with Euclid and Subaru, identified CDG-2 in the Perseus cluster as an extremely dark-matter–dominated galaxy—about 245 million to 300 million light-years away—where 99% of its mass is dark matter. The galaxy was detected indirectly by tracing four tightly packed globular clusters, which reveal a faint glow around them. Its normal matter is estimated at roughly 6 million sun-like stars, with about 16% accounted for by the globular clusters, suggesting past star formation that has since been stripped away by gravitational interactions. The discovery, highlighting a “dark galaxy” category, was reported in The Astrophysical Journal Letters.
Astronomers using the Hubble Space Telescope identified CDG-2, a very dim galaxy in the Perseus cluster that appears to be 99% dark matter, with most of its normal matter stripped away by the crowded environment; the galaxy is inferred from a surrounding globular cluster population, marking it as one of the most dark-matter–dominated galaxies and a test bed for theories of dark matter and star formation.