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Quiet Galaxy Cluster Unveils a Giant 3.3-Million-Light-Year Radio Halo
science16 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
Hidden Filaments in Milky Way Core Trace Ancient Black Hole Outflow
astronomy26 days ago

Hidden Filaments in Milky Way Core Trace Ancient Black Hole Outflow

Astronomers using the MeerKAT radio telescope found a new population of horizontal, 5–10 light-year filaments near the Galactic Center that point toward Sagittarius A*. Their thermal emissions and alignment along the galactic plane differ from previously known vertical filaments, suggesting a past energetic outflow from the Milky Way’s central black hole and offering clues about its accretion disk orientation and history.

via The Daily Galaxy|
#astronomy#filaments#meerkat
Hidden Vela-Banzi Supercluster Expands Our Cosmic Map
space1 month ago

Hidden Vela-Banzi Supercluster Expands Our Cosmic Map

Astronomers mapped the Vela-Banzi supercluster behind the Milky Way, stretching about 300 million light-years across with at least 20 galaxy clusters and a mass around 30 quadrillion suns, located roughly 800 million light-years away in the Zone of Avoidance; two massive cores are converging, indicating ongoing growth. The map draws on some 65,000 distance measurements and about 8,000 redshifts (including ~2,000 from MeerKAT), refining our view of nearby cosmic structure and cosmological models.

via The Daily Galaxy|
#meerkat#radio-astronomy#space
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
Gigamaser Beacon Detected From 8 Billion Light-Years Away by MeerKAT
science2 months ago

Gigamaser Beacon Detected From 8 Billion Light-Years Away by MeerKAT

Astronomers using the MeerKAT radio telescope detected a bright, narrow 18-centimeter hydroxyl emission line from the distant galaxy system HATLAS J142935.3-002836 at z=1.027 (about 8 billion light-years away). The signal is amplified by a foreground galaxy’s gravitational lensing and the background merger’s dense, energized gas, pushing it toward megamaser/gigamaser levels. The rapid detection in a few hours demonstrates MeerKAT’s capability to find distant hydroxyl emitters in wide surveys.

via The Daily Galaxy|
#galaxy-merger#gravitational-lensing#hatlas-j1429353-002836
Distant Galaxy Collision Yields Brightest Gigamaser Yet
science2 months ago

Distant Galaxy Collision Yields Brightest Gigamaser Yet

Astronomers using the MeerKAT radio telescope have detected the brightest and most distant hydroxyl gigamaser, produced when gas in colliding galaxies stimulates hydroxyl molecules to emit intense microwaves. The signal, traveling about 7.8–8 billion light-years, is magnified by a foreground galaxy acting as a gravitational lens, making it appear exceptionally bright. The discovery advances study of high-redshift OH megamasers and galaxy mergers and is published (preprint available) in Monthly Notices of the Royal Astronomical Society Letters.

via ScienceAlert|
#galaxy-collision#gigamaser#gravitational-lensing
Cosmic laser beacon: brightest megamaser seen from 8 billion light-years away via gravitational lensing
space2 months ago

Cosmic laser beacon: brightest megamaser seen from 8 billion light-years away via gravitational lensing

Astronomers using the MeerKAT radio telescope have detected the brightest and most distant hydroxyl megamaser from a galaxy merger about 8 billion light-years away. The signal, amplified by gravitational lensing, may qualify as a gigamaser and provides a rare beacon to study how ancient galaxies form and evolve; scientists hope to find many more such megamasers to map the cosmos’s history.

via Live Science|
#galaxy-merger#gravitational-lensing#hydroxyl
Cosmic Space Laser: Gigamaser Detected in Distant Galaxy
space2 months ago

Cosmic Space Laser: Gigamaser Detected in Distant Galaxy

Astronomers using the MeerKAT radio telescope detected a record-breaking microwave laser (a gigamaser) in a galaxy about 8 billion light-years away, magnified by gravitational lensing. The emission, arising from excited hydroxyl molecules during a galaxy merger, is roughly 100,000 times the luminosity of a star and is the most powerful maser yet observed. Upgrades to MeerKAT could uncover hundreds to thousands more such megamasers, offering insight into conditions in the distant universe.

via Futurism|
#gigamaser#gravitational-lensing#h1429-0028
Giant Rotating Cosmic Filament Rewrites How Galaxies Get Their Spin
astronomy3 months ago

Giant Rotating Cosmic Filament Rewrites How Galaxies Get Their Spin

An Oxford-led team identifies a giant, razor-thin cosmic filament about 140 million light-years away that is rotating with galaxies aligned to its spin, offering new insights into how galaxies acquire angular momentum and evolve. The finding, enabled by MeerKAT’s MIGHTEE survey and complemented by DESI and SDSS data, challenges existing models of galaxy formation within the cosmic web.

via The Daily Galaxy|
#angular-momentum#astronomy#cosmic-filaments
Deep Space Radio Bursts Hit Earth in Rapid Succession
science9 months ago

Deep Space Radio Bursts Hit Earth in Rapid Succession

A team using MeerKAT in South Africa discovered a highly active repeating fast radio burst source, FRB 20240619D, emitting hundreds of short radio pulses across multiple frequencies, providing valuable insights into the nature of these cosmic phenomena and their potential origins near magnetars, while also setting limits on optical counterparts and helping map the universe's ionized gas.

via Earth.com|
#cosmic-web#fast-radio-bursts#frb-20240619d
Gravitational Waves Unveil Hidden Cosmic Structures and Black Holes
science1 year ago

Gravitational Waves Unveil Hidden Cosmic Structures and Black Holes

Astronomers from Swinburne University have created the most detailed maps of gravitational waves, revealing hidden black holes and cosmic structures. Using the MeerKAT Pulsar Timing Array, they detected a strong gravitational wave signal from merging supermassive black holes, uncovering unexpected hotspots that suggest directional biases. This research offers new insights into the universe's evolution and the formation of massive black holes, challenging previous assumptions about the gravitational wave background's distribution.

via Phys.org|
#astronomy#blackholes#gravitationalwaves
MeerKAT Unveils New Giant Radio Galaxy
science1 year ago

MeerKAT Unveils New Giant Radio Galaxy

Astronomers using the MeerKAT radio telescope have discovered a new giant radio galaxy, MGTC J100022.85+031520.4, in the COSMOS field. This galaxy, hosted by an elliptical galaxy with a redshift of 0.1034, spans about 4.2 million light years and is one of the few GRGs located in a galaxy cluster. The discovery, part of the MIGHTEE survey, provides insights into the formation and evolution of radio sources.

via Phys.org|
#astronomy#cosmos#giant-radio-galaxies
"MeerKAT Scan Unearths 49 New Galaxies in Record Time"
astronomy2 years ago

"MeerKAT Scan Unearths 49 New Galaxies in Record Time"

Astronomers using the MeerKAT radio telescope in South Africa have discovered 49 new galaxies while investigating the presence of hydrogen gas within a specific galaxy. The discovery provides insights into dynamic galactic interactions, with some galaxies actively siphoning gas from their neighbors. The MeerKAT radio telescope, a cornerstone in astronomical exploration, is part of the Square Kilometre Array (SKA) project and has detected radio galaxies and examined the Milky Way’s galactic center. Planned projects include surveys exploring star-forming hydrogen gas within new and existing galaxies, aiming to understand the evolutionary processes of galaxies.

via Giant Freakin Robot|
#astronomy#galaxies#hydrogen-gas