Tag

Black Hole

All articles tagged with #black hole

space14 days ago•5 min saved

Distant Black Hole Fades in a Human-Scale Timespan

Astronomers tracked galaxy J0218−0036 (about 10 billion light-years away) and found its central supermassive black hole dimmed by about 20x overall and ~50x in the active nucleus from the early 2000s to 2023. Dust obscuration was ruled out, pointing to an intrinsic drop in accretion with the Eddington ratio falling from ~0.4 to ~0.008. The observed e-folding timescale is roughly 2,000 days in the observed frame (~700 days rest frame), far faster than standard models predict, suggesting a change in accretion mode and challenging current black hole growth theories.

via Indian Defence Review|

#accretion #black-hole #galaxy

science26 days ago•17 min saved

Newborn black hole speeds away from merger, its escape traced in 3D

Astronomers have observed a newborn black hole from GW190412 speeding away from its birth site at about 112,000 mph (50 km/s). Using the event’s richer waveform, including higher-order modes, researchers reconstructed both the speed and the escape direction, providing a complete recoil portrait from a single merger. The result confirms that gravitational-wave–driven kicks can eject remnants from their birth environments, such as globular clusters, and shows how the remnant’s motion might influence any light produced as it plows through surrounding gas. Future detections of asymmetric mergers with identifiable higher-order modes will help map remnant motions across environments.

via Earth.com|

#astronomy #black-hole #gravitational-waves

science1 month ago•4 min saved

Astronomers Aim for the First Video of a Black Hole in Motion

Astronomers are using the expanded Event Horizon Telescope to capture frequent images of the supermassive black hole in M87—every 3–4 days from March through April—to assemble a time-lapse video of its motion and dynamics, potentially revealing its spin, how it feeds, and the behavior of its jets. Eleven of the twelve telescopes will participate (the South Pole telescope cannot see M87), and petabytes of data must be processed before the video can be constructed, while Sagittarius A* may be too restless for reliable imaging.

via CBC|

#astronomy #black-hole #event-horizon-telescope

science1 month ago•4 min saved

Black Hole Tears White Dwarf, Hinting at Hidden Intermediate-Mass BHs

Astronomers using China’s Einstein Probe spotted an extreme X-ray outburst (EP250702a) in a distant galaxy that models as an intermediate-mass black hole tearing apart a white dwarf, a finding supported by HKU simulations and follow-up observations. The event’s unusual timing and rapid evolution provide what researchers call the first direct evidence of this feeding process and could help uncover the long-m missing population of intermediate-mass black holes, with implications for multi-messenger astronomy.

via The Daily Galaxy|

#black-hole #ep250702a #intermediate-mass-black-hole

space1 month ago•5 min saved

Andromeda Star Vanishes—Direct Collapse to a Black Hole Confirmed

Using NEOWISE infrared data, astronomers tracked a massive Andromeda star, M31-2014-DS1, that brightened and then vanished over a few years, with optical/near-infrared follow-up supporting a direct collapse into a black hole without a supernova, a rare event that helps calibrate how massive stars end their lives.

via Universe Today|

#andromeda #black-hole #direct-collapse

space1 month ago•4 min saved

Andromeda star quietly collapses into a black hole, archival data reveal

Astronomers using archival NEOWISE infrared data have captured the clearest evidence yet that a massive star in the Andromeda Galaxy directly collapsed into a black hole, after brightening in infrared for about three years and leaving a dust shell; the event (M31-2014-DS1) from 2014 suggests some massive stars die without a supernova, refining ideas about stellar deaths.

via BBC Sky at Night Magazine|

#andromeda #archival-data #black-hole

space1 month ago•2 min saved

Milky Way’s Core May Be a Dense Dark Matter Core, Not a Black Hole

A new study proposes the Milky Way’s central mass could be a dense fermionic dark matter core rather than Sagittarius A*, capable of reproducing the observed fast S-star orbits and the galaxy’s Keplerian rotation decline, and it might even mimic the black hole shadow seen by the Event Horizon Telescope; while provocative, the idea isn’t yet proven and future observations are needed to confirm or refute it.

via Futurism|

#black-hole #dark-matter #fermionic-dark-matter

science2 months ago•5 min saved

Unprecedented Black Hole Jet Surges 50x Brighter in Rare TDE

Astronomers report a rare tidal disruption event AT2018hyz producing a narrow, ultra-fast jet from a supermassive black hole 665 million light-years away. The jet is now 50x brighter than when first detected, with total energy up to 5e55 ergs and a predicted peak around 2027, challenging typical TDE models with a long-lived jet. Future observations, including with the SKA, will help uncover more such events.

via The Daily Galaxy|

#at2018hyz #black-hole #jet

space2 months ago•81 min saved

Distant black hole’s mega-jet dwarfs the Death Star’s power

Astronomers report an ultra-powerful jet from AT2018hyz, a tidal disruption event around a supermassive black hole about 665 million light-years away. Nicknamed “Jetty McJetface,” the jet’s energy output is estimated up to 5×10^55 ergs—between a trillion and 100 trillion times the Death Star’s fictional energy—and it is currently about 50 times more luminous than at first detection in 2018. Models suggest the peak brightness will occur in 2027 as the jet evolves. Jets from TDEs are rare (roughly 1% of cases), and future radio surveys like the SKA could find more such events.

via Space|

#astronomy #at2018hyz #black-hole

space2 months ago•82 min saved

Jetty McJetface marks a new era of cosmic energy in a black-hole jet

A jet from the supermassive black hole AT2018hyz—nicknamed Jetty McJetface—has brightened over four years to become one of the universe’s most energetic events. The radio emission is now at least a trillion times more energetic than the Death Star and is predicted to peak around 2027, as the star‑shredding tidal disruption powers an increasingly powerful jet that is likely not aimed at Earth.

via Live Science|

#at2018hyz #black-hole #jet

science2 months ago•36 min saved

Shadow to Jet: Astronomers Tie a 3,000‑Light‑Year Outflow to M87*’s Shadow

Using the Event Horizon Telescope’s VLBI observations of M87*, researchers traced the base of the galaxy’s 3,000‑light‑year jet to a region near the black hole’s shadow, linking jet launching to the accretion flow around the supermassive black hole (about 6.5 billion suns) and connecting theory to observation. The finding, based on 2021 data and building on the 2019 image of M87*, was published in Astronomy & Astrophysics.

via Yahoo|

#black-hole #event-horizon-telescope #jet

space2 months ago•75 min saved

M87* Shadow Reveals Jet's Start Point Across 3,000 Light-Years

Astronomers using the Event Horizon Telescope's VLBI observations linked the glowing ring around the supermassive black hole M87* to the base of its 3,000‑light‑year jet, pinpointing where jets originate and helping to illuminate how these powerful outflows are launched from black holes; the findings were published in Astronomy & Astrophysics.

via Space|

#black-hole #event-horizon-telescope #jet

space2 months ago•5 min saved

Andromeda’s Vanished Star Triggers Black Hole or Merger Theories

A 13-solar-mass yellow supergiant in the Andromeda Galaxy (M31-2014-DS1) brightened in 2014 but faded by 2018 without a canonical supernova. Two studies offer competing explanations: one proposes a failed supernova—a direct collapse into a black hole shrouded in dust that hides X‑ray emissions—leaving a faint red source surrounded by a dust shell. A second team questions this, noting no X‑ray activity and suggesting a stellar merger could produce the observed infrared glow and dust, with the central source possibly reappearing as the dust dissipates. Ongoing JWST observations and further monitoring are needed to confirm whether the star collapsed invisibly, merged, or will brighten again.

via The Daily Galaxy|

#andromeda #astronomy #black-hole

space2 months ago•55 min saved

Cosmic Volcano: Monster Black Hole Reawakens After 100 Million Years

Astronomers using LOFAR observed a supermassive black hole at the center of a giant galaxy (J1007+3540) that had been quiet for about 100 million years. The black hole’s enormous radio jets have reactivated, interacting with the surrounding hot gas and forming a layered structure—signaling episodic active galactic nucleus activity and a dramatic wake-up in the cosmic engine.

via Live Science|

#astronomy #black-hole #episodic-agn

astronomy2 months ago•4 min saved

A Wobbling Black Hole Jet Could Starve Its Galaxy of New Stars

Astronomers have observed a precessing, high-velocity jet from a supermassive black hole in VV 340a heating and ejecting gas across the galaxy, potentially quenching star formation; the outflow rate is about 19 solar masses per year, and multiwavelength data from JWST, Keck, VLA, and ALMA reveal how such black-hole activity can reshape galactic evolution.

via The Daily Galaxy|

#astronomy #black-hole #galaxy-evolution