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Quasars

All articles tagged with #quasars

science17 days ago

Revolutionary Breakthrough Challenges 50-Year Black Hole Theory

An international team of astronomers has found evidence suggesting that the relationship between ultraviolet and X-ray emissions in quasars has evolved over billions of years, challenging the long-standing assumption of its universality and potentially impacting cosmological models. Using data from eROSITA and XMM-Newton, they observed differences in this relationship in quasars from the early universe compared to the present day, which could influence our understanding of black hole growth and the universe's expansion.

via The Daily Galaxy|
#astronomy#black-holes#cosmic-evolution
science3 months ago

Scientists Explain Why Days Are Getting Shorter

Earth's days are slightly getting shorter due to factors like atmospheric winds, ocean currents, Earth's internal movements, and lunar gravitational pull, with the shortest day on August 5, 2025, measuring just 86,399.99867 seconds. These tiny variations, measurable with precise instruments like atomic clocks and quasars, impact systems like GPS and are influenced by both short-term weather patterns and long-term geophysical processes.

via Neowin|
#earth-rotation#geophysical-changes#leap-seconds
science4 months ago

Astronomers Find Dozens of New Bright Quasars

Astronomers from Seoul National University and others have discovered 62 new luminous quasars using the AllBRICQS survey, which utilizes WISE and Gaia data to identify bright quasars. These quasars, with redshifts between 0.09 and 2.48 and extremely high luminosities, include rare objects like the most luminous iron low-ionization broad absorption line quasar to date, providing valuable resources for studying black hole growth and galaxy evolution.

via Phys.org|
#allsky-survey#astronomy#black-holes
science7 months ago

James Webb Telescope Discovers New Hidden Black Hole Type

Using the James Webb Space Telescope, astronomers have discovered a new, previously unseen type of supermassive black hole activity in the early universe, bridging the gap between classical quasars and faint, dust-obscured objects called Little Red Dots, which may represent baby quasars. This finding suggests that many active black holes in the early universe have been overlooked and provides new insights into galaxy evolution and black hole growth.

via Yahoo|
#black-holes#early-universe#hidden-agns
science1 year ago

Hubble Unveils Mysterious Structures Near Quasar's Supermassive Black Hole

NASA's Hubble Space Telescope has captured detailed images of the quasar 3C 273, revealing complex structures and energetic jets near its supermassive black hole. These observations provide new insights into the mechanics of quasars and their galactic environments. Quasars, like 3C 273, are powered by supermassive black holes consuming surrounding material, and are crucial for understanding galaxy formation and evolution. The Hubble's advanced imaging capabilities have allowed astronomers to study these phenomena in unprecedented detail, paving the way for future research with instruments like the James Webb Space Telescope.

via SciTechDaily|
#astronomy#black-holes#galaxies
science1 year ago

Supermassive Black Holes Challenge Physics with Monstrous Growth

A study using XMM-Newton and Chandra telescopes has linked X-ray emissions from 21 distant quasars to rapid growth of supermassive black holes in the early Universe, suggesting they grew through super-Eddington accretion rates. This challenges conventional physics by showing how these black holes, with masses billions of times that of the Sun, formed quickly within a billion years after the Big Bang. The findings, part of the HYPERION project, provide insights for future X-ray missions to better understand the formation of early cosmic structures.

via SciTechDaily|
#cosmic-dawn#quasars#science
science1 year ago

New Insights Reveal How Supermassive Black Holes Defy Physics

Scientists have discovered that supermassive black holes in the early universe may have grown rapidly by defying the Eddington limit, a rule that typically restricts their growth. Using X-ray data from the XMM-Newton and Chandra telescopes, researchers found evidence of "super-Eddington accretion," where these black holes consumed matter at rates that should have been impossible, allowing them to reach massive sizes less than a billion years after the Big Bang. This finding could help solve the mystery of how such large black holes formed so quickly.

via Space.com|
#early-universe#eddington-limit#quasars
science1 year ago

Astronomers Unveil Rare Galaxy System with Quasi-Stellar Object

Astronomers have discovered a unique system consisting of a quasi-stellar object (QSO) and a dusty star-forming galaxy (DSFG) connected by a bridge of ionized carbon, using the Atacama Large Millimeter/submillimeter Array (ALMA). This system, located at a redshift of 5.63, suggests an ongoing merger process, with the DSFG exhibiting intense star formation and potential active galactic nucleus activity. The discovery provides insights into galaxy-quasar co-evolution during the reionization epoch.

via Phys.org|
#alma#astronomy#galaxies
science-and-technology1 year ago

"Early Universe Quasar Challenges Black Hole Formation Theories"

The James Webb Space Telescope has observed a mature quasar, J1120+0641, from the early universe, revealing a supermassive black hole with over a billion solar masses. This challenges current models of galaxy evolution, as the black hole's growth mechanisms appear similar to those of modern quasars, suggesting that supermassive black holes may have formed with considerable initial masses.

via Phys.org|
#black-holes#cosmic-dawn#galaxy-evolution
science-and-technology1 year ago

First-Ever Merging Quasars Spotted at Cosmic Dawn

Astronomers have discovered the first-ever merging galaxy cores containing two supermassive black holes from the cosmic dawn, just 900 million years after the Big Bang. This finding, confirmed using the Subaru Telescope's Hyper Suprime-Cam, provides new insights into the formation of supermassive black holes and the evolution of galaxies during the Epoch of Reionization.

via Livescience.com|
#astronomy#black-holes#cosmic-dawn
astronomy1 year ago

"Scientists Debate Alien Dyson Sphere Candidates in Our Galaxy"

Seven candidate Dyson spheres identified by Project Hephaistos may actually be distant, dusty quasars, raising questions about their true nature. While some astronomers suggest these candidates could be extreme debris discs or background contamination from "Hot DOGs" (dust-obscured galaxies), further spectroscopic observations, potentially using the James Webb Space Telescope, are needed to confirm their identity.

via physicsworld.com|
#astronomy#dyson-sphere#infrared-radiation