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Alma

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ALMA captures Betelgeuse’s bubbling surface in unprecedented detail
space7 hours ago

ALMA captures Betelgeuse’s bubbling surface in unprecedented detail

Using ALMA, scientists captured 2023 images of Betelgeuse, a ~20-solar-mass red supergiant about 600 light-years away, revealing a turbulent, bubbling surface with bright hotspots caused by giant convective flows in its atmosphere; the warmest region in the northeast persists for at least seven years, hinting at long-lived surface structures and possibly a companion star; with atmospheric temperatures around 2,030°C and pockets hotter by about 530°C, these observations help explain mass loss and atmospheric dynamics as Betelgeuse nears its eventual supernova; the study will continue monitoring and is published in Astronomy & Astrophysics (arXiv).

via Space|
#alma#betelgeuse#convection
Giant gas river tilts planet-forming disk around GW Orionis
science8 days ago

Giant gas river tilts planet-forming disk around GW Orionis

Astronomers using ALMA found a massive streamer of gas feeding the three-ring protoplanetary disk around the young triple-star GW Orionis in Orion, tipping the outer ring and potentially explaining why some exoplanets have highly misaligned orbits. The streamer spans about 0.2 light-years and transfers angular momentum to the disk, reshaping how planets form in this system. While this could illuminate a mechanism for misaligned planets, researchers caution it’s based on one disk and plan broader surveys to see how common such streamers are.

via Space|
#alma#exoplanet-misalignment#gas-streamer
Milky Way’s Quiet Core Reveals Hidden Wind From Its Central Black Hole
space2 months ago

Milky Way’s Quiet Core Reveals Hidden Wind From Its Central Black Hole

Astronomers using ALMA and Chandra detected a cone-shaped cavity around Sagittarius A*, signaling a hot wind from the Milky Way’s central black hole that has cleared nearby gas; the outflow is estimated to have been active for at least 20,000 years, offering new insight into how Sgr A* influences its environment even in a relatively quiet state and into black hole feedback in galaxies.

via SciTechDaily|
#alma#black-hole-wind#chandra
Milky Way’s Central Black Hole Reveals Hidden Wind
science-space2 months ago

Milky Way’s Central Black Hole Reveals Hidden Wind

Astronomers using ALMA radio maps and NASA’s Chandra X-ray data detected a 3-light-year cone-shaped cavity around Sagittarius A*, the Milky Way’s supermassive black hole, indicating a previously unseen wind. The finding helps explain why our galaxy’s center appeared windless and provides a new observable for understanding how black holes influence their host galaxies.

via CNN|
#alma#black-hole-wind#chandra
Milky Way Core Winds: Evidence of Gas Outflows From Sgr A*
science2 months ago

Milky Way Core Winds: Evidence of Gas Outflows From Sgr A*

Astronomers used five years of ALMA observations, along with supporting data, to identify a wind emanating from the Milky Way’s central black hole, Sagittarius A*, including a southern lobe and evidence for a northern lobe. The wind consists of small gas wisps radiatively driven by the SMBH, demonstrating galactic-center feedback even from a relatively quiescent black hole.

via Hackaday|
#alma#astronomy#blackholes
Milky Way’s central black hole reveals a cosmic wind reshaping its surroundings
science2 months ago

Milky Way’s central black hole reveals a cosmic wind reshaping its surroundings

Astronomers using ALMA and Chandra observations have captured the first clear evidence of a wind blowing from the Milky Way’s central supermassive black hole, Sagittarius A*, carving a cone-shaped cavity in surrounding cold gas and indicating the black hole has been actively shaping its environment for at least 20,000 years while remaining relatively quiet compared with active galaxies.

via BBC Sky at Night Magazine|
#alma#black-hole#galactic-center
Milky Way’s central black hole finally reveals its wind after decades of looking
science2 months ago

Milky Way’s central black hole finally reveals its wind after decades of looking

After a 50-year search, astronomers using ALMA and NASA's Chandra X-ray Observatory have detected evidence of a wind flowing from Sagittarius A*, the Milky Way’s supermassive black hole. The wind appears to have carved a three-light-year cone in surrounding molecular gas, with X-ray data lining up to confirm the wind. Though relatively weak compared with winds from actively feeding black holes, it may have been active for about 20,000 years, providing a window into black hole outflows in a quiet state.

via Space|
#alma#blackholewinds#chandrax-ray
The Milky Way’s Core Unveiled: A High-Resolution Map of Galactic Gas
science3 months ago

The Milky Way’s Core Unveiled: A High-Resolution Map of Galactic Gas

Astronomers released the largest, most detailed image of the Milky Way's center, created with ALMA's 66 antennas to map cold molecular gas and dust at millimeter wavelengths. The mosaic reveals intricate gas filaments and molecular fingerprints, offering new insight into how stars form in the extreme environment around the galactic center, including a mysterious millimeter ultra-broad line object (MUBLO) detected only by ALMA. The project will be complemented by JWST observations to place our Galaxy in broader cosmic context and to inform theories of solar-system formation.

via WBUR|
#alma#interstellar-medium#milky-way
Interstellar Comet 3I/ATLAS Carries Unprecedented Heavy Water, Hinting at Cold Birth
space3 months ago

Interstellar Comet 3I/ATLAS Carries Unprecedented Heavy Water, Hinting at Cold Birth

Astronomers analyzing the interstellar comet 3I/ATLAS found an exceptionally high amount of heavy water (deuterium-rich water), suggesting it formed in a much colder, lower-radiation environment than our solar system. This marks the first successful water analysis of an interstellar object and points to diverse planetary-forming conditions across the galaxy, with future studies likely to reveal more such visitors as observational capabilities improve.

via ScienceDaily|
#3iatlas#alma#deuterium
Rare Quasar Pair Merges in the Early Universe, Illuminating Black Hole Growth
astronomy4 months ago

Rare Quasar Pair Merges in the Early Universe, Illuminating Black Hole Growth

Astronomers confirmed a rare, merging quasar pair at z=5.7 (about 1 billion years after the Big Bang) using ALMA, revealing two massive galaxies connected by a tidal bridge; both host galaxies harbor more than 10 billion solar masses and rapid star formation, signaling intense black hole growth during early mergers, which are expected to form a true binary in ~2.1 billion years and may impact the gravitational wave background.

via The Daily Galaxy|
#alma#astronomy#black-holes
Interstellar Comet 3I/ATLAS Carries Frozen Clues From Ultra-Cold Star-Forming Realms
space4 months ago

Interstellar Comet 3I/ATLAS Carries Frozen Clues From Ultra-Cold Star-Forming Realms

Astronomers using ALMA detected an exceptionally high abundance of deuterated water (HDO) in interstellar comet 3I/ATLAS—more than 30 times what’s typical in solar-system comets and over 40 times Earth's ocean water—indicating the comet formed in environments colder than about 30 Kelvin, far colder than the region that formed our solar system. The finding suggests interstellar comets carry preserved birth-region chemistry and underscores that planetary formation varies with local temperature and radiation across the galaxy.

via The Daily Galaxy|
#3iatlas#alma#astrochemistry
3I/ATLAS Traces Ultra-Cold Origins of an Interstellar Comet
science4 months ago

3I/ATLAS Traces Ultra-Cold Origins of an Interstellar Comet

Astronomers using the ALMA Observatory found that interstellar comet 3I/ATLAS contains unusually high deuterium in its water, implying it formed in a very cold, loner star-forming region long before the Sun. The object could be the oldest known interstellar visitor (up to about 11 billion years old); its nucleus is estimated to range from a quarter-mile to 3.5 miles (440 meters to 5.6 kilometers) across, and it is speeding away from the Sun at roughly 137,000 mph. The findings, published in Nature Astronomy, add context to other interstellar visitors like Oumuamua and 2I/Borisov.

via ScienceAlert|
#3iatlas#alma#comet
Milky Way Core Exposed: ALMA Reveals Complex Gas Web at Galactic Center
science5 months ago

Milky Way Core Exposed: ALMA Reveals Complex Gas Web at Galactic Center

Astronomers using the ALMA array produced the largest mosaic of the Milky Way’s center to date, mapping the Central Molecular Zone across roughly 650 light-years and revealing a web of cold gas filaments and dense clouds that feed star formation. The ACES collaboration, involving about 160 scientists from over 70 institutions, aims to test how star formation and chemistry operate in this extreme galactic environment. The dataset will sharpen our understanding of the galaxy’s evolution and will be followed by upgrades to ALMA and future telescopes for even deeper studies.

via ScienceAlert|
#alma#central-molecular-zone#galactic-center