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Galaxy Clusters

All articles tagged with #galaxy clusters

Quiet Galaxy Cluster Unveils a Giant 3.3-Million-Light-Year Radio Halo
science14 days ago

Quiet Galaxy Cluster Unveils a Giant 3.3-Million-Light-Year Radio Halo

Astronomers using the upgraded uGMRT and MeerKAT confirm a giant radio halo spanning 3.3 million light-years in the relatively quiet galaxy cluster RXCJ0232–4420, challenging the view that such halos only form in violent mergers. The halo shows a uniform spectral index around −1.1, extends across frequencies, and correlates with hot X-ray gas, with an eastern relic detected and the cluster in an intermediate dynamical state while preserving a cool core.

via The Daily Galaxy|
#galaxy-clusters#meerkat#radio-astronomy
Cosmic gravity passes its biggest test yet, keeping dark matter in the spotlight
science16 days ago

Cosmic gravity passes its biggest test yet, keeping dark matter in the spotlight

Using the kinematic Sunyaev-Zeldovich effect on about 686,000 galaxies in clusters 5–7 billion light-years away, researchers measured cluster speeds and found gravity weakens with distance consistent with Newtonian/Einsteinian gravity, strengthening the case for dark matter as the source of anomalous gravitational effects, though many questions remain. The study was published in Physical Review Letters.

via ScienceAlert|
#cosmology#dark-matter#galaxy-clusters
Hidden Giant: Vela Supercluster Maps Vast Structure Beyond Milky Way
science26 days ago

Hidden Giant: Vela Supercluster Maps Vast Structure Beyond Milky Way

Researchers mapped the Vela Supercluster, a colossal assembly of galaxies hidden behind the Milky Way’s dust in the Zone of Avoidance, about 800 million light-years away. It spans roughly 300 million light-years and contains mass equivalent to about 30 quadrillion suns, making it one of the universe’s largest known structures and helping refine cosmological models, with observations from SALT and MeerKAT aiding the map.

via Yahoo|
#galaxy-clusters#milky-way#radio-telescopes
Cosmic Giant Vela Supercluster Mapped Behind the Milky Way
space1 month ago

Cosmic Giant Vela Supercluster Mapped Behind the Milky Way

Astronomers have for the first time mapped the Vela Supercluster, a colossal structure roughly 300 million light-years across that houses at least 20 galaxy clusters and contains about 30 quadrillion solar masses. Hidden behind the Milky Way’s Zone of Avoidance, the map was built from 65,000 existing distance measurements and ~8,000 new redshifts (including ~2,000 from the MeerKAT radio telescope), revealing two massive cores moving toward each other and placing Vela among the universe’s largest known structures—larger than Laniakea and rivaling the Shapley Supercluster. This new view could refine models of cosmic structure and dynamics, though parts of the spread will remain obscured by dust and gas.

via Live Science|
#cosmology#galaxy-clusters#meerkat
Cosmic Gravity Holds Its Ground Across Galaxy Clusters
astronomy1 month ago

Cosmic Gravity Holds Its Ground Across Galaxy Clusters

Using data from the Atacama Cosmology Telescope and the kinematic Sunyaev–Zeldovich effect, researchers tracked hundreds of thousands of galaxy clusters across hundreds of millions of light-years and found gravity obeys the inverse-square law on cosmological scales, aligning with Newtonian and Einsteinian gravity, reinforcing dark matter as the source of extra gravitational effects and challenging alternative gravity theories like MOND.

via SciTechDaily|
#astronomy#cosmology#dark-matter
Webb Finds the Earliest Jellyfish Galaxy Drifting Through a Young Cosmos
space2 months ago

Webb Finds the Earliest Jellyfish Galaxy Drifting Through a Young Cosmos

Astronomers using the James Webb Space Telescope have identified the farthest known jellyfish galaxy, at redshift z=1.156 (about 8.5 billion years old), in the COSMOS field. The galaxy shows blue, newly formed stars in long trailing gas streams created by ram-pressure stripping as it speeds through a dense cluster, implying harsh cluster environments existed earlier in the universe and potentially reshaping ideas about how galaxies evolved billions of years ago.

via ScienceDaily|
#early-universe#galaxy-clusters#jellyfish-galaxy
Unprecedented Low-Frequency Radio Sky Map Reveals 13.7 Million Cosmic Sources
science3 months ago

Unprecedented Low-Frequency Radio Sky Map Reveals 13.7 Million Cosmic Sources

Astronomers released LoTSS-DR3, the most detailed low-frequency radio sky map from the LOFAR network, cataloging 13.7 million cosmic sources and offering new insights into supermassive black holes, their jets, and galaxy clusters, while tackling ionospheric distortions with advanced data-processing techniques on ~18.6 petabytes of data.

via The Daily Galaxy|
#galaxy-clusters#lofar#lotss-dr3
XRISM reveals the turbulent winds around supermassive black holes
astronomy3 months ago

XRISM reveals the turbulent winds around supermassive black holes

NASA/JAXA’s XRISM X‑ray mission uses high‑resolution spectroscopy to measure gas motions around supermassive black holes, notably M87* and the Perseus cluster, unveiling the strongest turbulence seen near a black hole and the kinetic energy of surrounding gas. This helps explain how black holes heat their environments and influence galactic evolution; findings published late Jan 2026 in Nature and built on XRISM’s 2023 launch in collaboration with ESA.

via Space|
#astronomy#black-holes#galaxy-clusters
Baryons Take the Lead in Galaxy Clusters, MOND Gains Ground
astronomy3 months ago

Baryons Take the Lead in Galaxy Clusters, MOND Gains Ground

A Bonn-led study analyzing 46 nearby galaxy clusters finds their mass is about twice as heavy in baryonic matter as previously thought, due to components like stellar remnants and intracluster light. The revised accounting brings cluster masses closer to MOND predictions and challenges the need for exotic dark matter, with authors suggesting a reevaluation of dark-matter-focused research funding.

via Universe Today|
#astronomy#baryonic-matter#dark-matter
Earliest Protocluster Unveiled by JWST Signals Rapid Cosmic Growth
astronomy3 months ago

Earliest Protocluster Unveiled by JWST Signals Rapid Cosmic Growth

Using the James Webb Space Telescope and NASA’s Chandra X-ray Observatory, scientists observed the most distant protocluster yet seen, JADES-ID1, forming when the universe was about 1 billion years old. Light from this building cluster has travelled 12.7 billion years to reach Earth, revealing multiple galaxies bound by gravity within a surrounding cloud of hot gas and X‑ray emission. The finding—published in Nature—suggests galaxy clusters grew far more quickly in the early universe than current models had predicted, raising new questions about how these massive structures assembled.

via Space|
#astronomy#early-universe#galaxy-clusters
Scientists Race to Uncover Dark Matter's Hidden Nature
science4 months ago

Scientists Race to Uncover Dark Matter's Hidden Nature

Scientists are exploring the nature of dark matter, which makes up about 85% of the universe's matter, by studying galaxy clusters with NASA's XRISM telescope. They are particularly interested in detecting signals from hypothetical particles called sterile neutrinos, which could decay and produce observable X-ray emissions, potentially revealing the particles that constitute dark matter.

via Space|
#cosmic-rays#dark-matter#galaxy-clusters