All articles tagged with #perseus cluster
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.
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.
NASA’s Hubble identified CDG-2, a remarkably dark matter–dominated, low-surface-brightness galaxy in the Perseus cluster, by spotting a small group of globular clusters and a faint surrounding glow. Four tightly bound clusters signal an underlying galaxy whose luminosity is about 6 million Sun-like stars, with about 99% of its mass in dark matter and most normal matter stripped away by gravitational interactions. Confirmed through combined data from Hubble, the Euclid mission, and the Subaru Telescope, this is the first galaxy detected primarily via its globular clusters, illustrating how upcoming surveys and machine-learning methods will uncover more such faint systems.
NASA's IXPE mission's longest observation of the Perseus Cluster has identified the origin of X-rays in a supermassive black hole's jet, confirming that the X-rays originate from inverse Compton scattering within the jet, primarily supporting the synchrotron self-Compton model, through polarization measurements combined with data from other observatories.
The Euclid space telescope has discovered 1.5 trillion orphan stars in the Perseus cluster, revealing faint intracluster light that could help scientists map dark matter and understand the origins of these stars, which appear to come from small galaxies.
The Euclid space telescope has discovered 1.5 trillion orphan stars in the Perseus galaxy cluster, emitting faint intracluster light. These stars, originating from disrupted smaller galaxies, are spread up to 2 million light-years from the cluster's center. The findings suggest a recent merger in the cluster, causing gravitational disturbances. This discovery, part of Euclid's early observations, enhances understanding of galaxy evolution and dark matter mapping.
Galaxy NGC 1277, located in the Perseus Cluster, appears to be missing dark matter, challenging current cosmological models. Dark matter, which makes up 85% of the matter in the universe, is typically present in large galaxies. The absence of dark matter in NGC 1277 suggests that it may have been stripped away by gravitational interactions or expelled during the galaxy's formation. This discovery challenges alternative theories to dark matter and raises questions about how a massive galaxy can form without it. Further research is needed to understand this anomaly.
Astronomers classify galaxies as "alive" if they are actively forming new stars. Galaxies lacking new stellar populations are called "red-and-dead." Molecular gas reserves are key to forming new stars within galaxies, and if a galaxy possesses no new stars, it must be gas-free. Gas can be removed by intense star-formation periods, mergers, and interactions. Rapid journeys through a galaxy cluster's intergalactic medium also strip interior gas away. The first red-and-dead galaxy in our cosmic backyard was identified in 2018: NGC 1277, which hasn't formed new stars in approximately 10 billion years.