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Radio Astronomy

All articles tagged with #radio astronomy

Orion Nebula Exposes Complex Shells From Repeated Stellar Feedback
astronomy3 days ago

Orion Nebula Exposes Complex Shells From Repeated Stellar Feedback

Using combined 21 cm HI observations from the VLA and FAST, researchers produced the sharpest radio maps of neutral hydrogen around the Orion Nebula, revealing giant expanding shells, cavities, and a four-light-year protrusion inside a second cavity. The structures imply the region was sculpted by multiple generations of massive stars rather than a single bubble, and the HI mass is revised down from ~1000 to ~100 solar masses. Published in Astronomy & Astrophysics as part of the NeAtHood project, the findings challenge simple star-formation models and showcase the power of modern radio interferometers, hinting at more hidden structure to come.

via Sci.News|
#astronomy#neutral-hydrogen#orion-nebula
Nearby ravenous black hole mirrors early-universe feeding frenzy
space4 days ago

Nearby ravenous black hole mirrors early-universe feeding frenzy

Astronomers observe a supermassive black hole at the center of SDSS J110546.07+145202.4 (about 1.8 billion light-years away) in a rapid accretion phase, launching jets and causing a roughly 20-fold increase in radio brightness over about eight years. The behavior resembles the vigorous feeding seen in the early universe, providing a nearby laboratory to study extreme accretion physics and jet production. The finding, published in The Astrophysical Journal (May), suggests such rapidly changing radio galaxies could help fill gaps in our understanding of early galaxy growth, with future SKA surveys expected to identify more transients.

via Space|
#accretion#black-holes#early-universe
Giant Unexplained Radio Rings Hint at a New Class of Cosmic Structures
space5 days ago

Giant Unexplained Radio Rings Hint at a New Class of Cosmic Structures

Astronomers have identified eight gigantic rings of radio emission in deep space, each more than 50 times the Milky Way’s width and visible only at radio wavelengths; their origins are unknown, though three rings sit at galaxy centers, suggesting the rings may be produced by galactic activity and could represent a new class of astronomical objects.

via Boing Boing|
#galaxies#new-class-of-astronomical-objects#odd-radio-circles
Feeble Radio Whispers Reveal the Blue Eye Pulsar After Decades of Silence
space8 days ago

Feeble Radio Whispers Reveal the Blue Eye Pulsar After Decades of Silence

Astronomers using the MeerKAT telescope detected faint radio pulses from the central compact object 1E 1207.4-5209—the Blue Eye Pulsar—located about 10,000 light-years away in the Milky Way. The neutron star emits radio waves every 424 milliseconds, matching its rotation and suggesting that some radio-quiet central compact objects can produce detectable radio emission under certain magnetic-field conditions, possibly triggered by a 2015 spin glitch. The finding implies a larger population of ultra-faint pulsars in the galaxy and could help explain missing pulsars in some supernova remnants, with the study published in Nature Astronomy on June 25.

via Space|
#meerkat#neutron-star#pulsars
Blue Eye Pulsar Finds Its Voice: Faint Radio Pulses Detected
science8 days ago

Blue Eye Pulsar Finds Its Voice: Faint Radio Pulses Detected

Using the MeerKAT radio telescope, astronomers detected very faint radio pulses from 1E 1207.4-5209, a central compact object at the center of a supernova remnant nicknamed the Blue Eye Pulsar, about 10,000 light-years away. The signal matches the 424-millisecond spin, marking the first detection of radio emission from this quiet neutron star after decades; a 2015 spin glitch may have reoriented or boosted its magnetic field to make the pulses detectable, suggesting many more such faint pulsars exist and possibly explaining missing pulsars in remnants like SN 1987A.

via Yahoo|
#central-compact-object#meerkat#neutron-star
Dormant supermassive black hole reawakens, unleashing a fresh jet across a million light-years
space12 days ago

Dormant supermassive black hole reawakens, unleashing a fresh jet across a million light-years

Astronomers observed galaxy J1007+3540 in the WHL 100706.4+354041 cluster, where a supermassive black hole that had been dormant for about 100 million years has restarted activity, producing a new, bright jet alongside older, faded radio lobes from a prior active phase. Using LOFAR and the upgraded GMRT, the team found the outer, low-frequency lobes are ~240 million years old while a younger inner jet is ~140 million years old, indicating episodic AGN activity. The jets are being distorted by the hot intracluster medium, illustrating how environment shapes jet evolution and confirming that some supermassive black holes cycle between active and dormant states on hundreds of millions of years timescales.

via Space Daily|
#agn#black-hole#galaxy-cluster
Milky Way Radio Enigma Sparks Talk of a New Class of Objects
science17 days ago

Milky Way Radio Enigma Sparks Talk of a New Class of Objects

A six-appearance, highly polarised radio transient near the Galactic Centre (ASKAP J173608.2−321635) has baffled researchers because it produced no X-ray or infrared counterparts; while not yet proven to be a new object class, it highlights the potential for unseen astrophysical phenomena revealed by wide-field radio surveys and the need for simultaneous multiwavelength follow-up.

via Space Daily|
#askap#milky-way-center#polarization
Giant bow-and-arrow radio galaxy RAD-BAARG reveals colossal cluster shock wave
space17 days ago

Giant bow-and-arrow radio galaxy RAD-BAARG reveals colossal cluster shock wave

Astronomers have identified RAD-BAARG, a 1.8-million-light-year-wide radio galaxy with a bow-and-arrow shape likely produced by a galaxy moving supersonically through a galaxy cluster, creating a giant bow shock; discovered by citizen scientists in the RAD@home project and studied with LOFAR's LoTSS survey, its asymmetric jets highlight how cluster environments reshape radio galaxies. The system lies in a complex, multi-halo gas environment, offering insights into jet–environment interactions; findings published June 22 in Monthly Notices of the Royal Astronomical Society: Letters, demonstrating LOFAR's ability to detect faint, diffuse radio emission.

via Space|
#galaxies#galaxy-clusters#lofar
Nevada Desert to Welcome 1,650-Dish Deep Synoptic Array
science23 days ago

Nevada Desert to Welcome 1,650-Dish Deep Synoptic Array

Caltech’s Deep Synoptic Array will be built in Nevada’s White Pine County as a 1,650-dish radio telescope network designed to survey the sky 100 times faster and produce sharper radio images, enabling precise localization of radio sources for follow-up by optical, infrared and X-ray observatories; funded by Schmidt Sciences, with prototype dishes already built and construction planned to begin next year and finish by 2029.

via NBC News|
#caltech#deep-synoptic-array#nevada
Black holes' delayed radio burps decoded
space26 days ago

Black holes' delayed radio burps decoded

Scientists reveal that the delayed radio bursts from tidal disruption events (stars torn apart by supermassive black holes) occur when the black hole’s feeding rate is either too fast or too slow, ejecting gas that slams into surrounding material to produce radio emissions. By combining decades of VLA radio data with optical/UV and X-ray follow-ups for 31 well-tracked TDEs (from a larger sample of 91 candidates), researchers mapped the actual gas consumption over time and linked late flares to two feeding-rate extremes. A helium emission signature in early spectra also signals a delayed disk formation. The study suggests a two-to-six-year window after discovery to detect these late emissions and shows the mechanism works across vastly different black-hole masses, helping scientists optimize telescope time.

via Space|
#astronomy#black-holes#radio-astronomy
Nevada hosts Caltech's 1,650-dish Deep Synoptic Array for real-time cosmic surveys
space-and-spaceflight29 days ago

Nevada hosts Caltech's 1,650-dish Deep Synoptic Array for real-time cosmic surveys

Caltech’s Deep Synoptic Array (DSA) will comprise 1,650 radio dishes spread over roughly 12 by 10 miles in Nevada, designed to survey the cosmos 100 times faster than existing telescopes and relay radio images in real time through a powerful supercomputer, with data made openly accessible to researchers and the public.

via Gizmodo|
#caltech#deep-synoptic-array#open-data
MeerKAT spots record-distance hydroxyl megamaser, peering into the early universe
science1 month ago

MeerKAT spots record-distance hydroxyl megamaser, peering into the early universe

South Africa's MeerKAT radio telescope detected the most distant hydroxyl megamaser yet observed—in a violently merging galaxy more than 8 billion light-years away—thanks to gravitational lensing and wide bandwidth. The rapid 5-hour detection showcases MeerKAT's capabilities and foreshadows many more such discoveries with the SKA and ngVLA, offering new insights into galaxy evolution and extreme star-forming environments in the early universe.

via The Conversation|
#early-universe#gravitational-lensing#hydroxyl-megamaser
No Alien Signals Detected in 3I/ATLAS Scan
space1 month ago

No Alien Signals Detected in 3I/ATLAS Scan

A team from SETI Institute and Breakthrough Listen used the Allen Telescope Array to scan 3I/ATLAS across a wide range of radio frequencies, filtering 74 million raw hits down to about 2 million candidates and then to 211 signals; none exhibited artificial signatures and all were attributed to radio-frequency interference. The result provides no evidence of alien technosignatures in this interstellar object but demonstrates that current technology can detect signals if present and supports continuing searches for technosignatures in future observations.

via Futurism|
#3iatlas#breakthrough-listen#radio-astronomy