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Early Universe

All articles tagged with #early universe

TV Snow Carried the Universe’s Oldest Light, Mostly Hidden in Plain Sight
science3 days ago

TV Snow Carried the Universe’s Oldest Light, Mostly Hidden in Plain Sight

A Space Daily explainer shows that some analog TV static came from the cosmic microwave background, the faint relic light from the early universe, though the exact share is device- and environment-dependent and often overstated as a fixed percent. Most of the snow was from the TV set itself and terrestrial noise, not the CMB. The CMB was discovered by Penzias and Wilson in 1964–65 and interpreted as Big Bang relic light by Dicke’s group; it dates to about 380,000 years after the Big Bang (recombination) and has cooled to ~2.7 kelvin today. With analog broadcasting retired, the historical “oldest light” is a memory, though the science remains.

via Space Daily|
#analog-television#cosmic-microwave-background#early-universe
JWST Spots Mature, Chaotic Galaxies in the Early Universe, Forcing Revisions to Early Formation Models
science8 days ago

JWST Spots Mature, Chaotic Galaxies in the Early Universe, Forcing Revisions to Early Formation Models

JWST observations of galaxies formed within the universe’s first billion years reveal unexpectedly massive, non-rotating, and dust-rich systems with chaotic morphologies. These findings strain the standard Lambda-CDM prescriptions for early star formation efficiency, feedback, and assembly, suggesting the need to revise the models rather than overturn the overall cosmology. Spectroscopic follow-up and updated cosmological simulations are underway to identify which parameters (star-formation efficiency, IMF, dust corrections, etc.) must be adjusted, while Lambda-CDM itself remains intact at large scales.

via Space Daily|
#early-universe#galaxy-formation#high-redshift-galaxies
JWST Finds Pristine Galaxy from Cosmic Dawn via Gravitational Lens
science13 days ago

JWST Finds Pristine Galaxy from Cosmic Dawn via Gravitational Lens

Using JWST and a foreground galaxy cluster to lens the faint object LAP1-B, astronomers observe a tiny, 800-million-year-old galaxy whose glow comes from gas rather than stars. Its extremely low heavy-element content, plus emission from highly ionized carbon, points to fingerprints of the first Population III stars. With stellar mass only a few thousand suns and a dark-matter–dominated halo inferred from gas dynamics, LAP1-B serves as a rare fossil from cosmic dawn, shedding light on early star formation and the pre-reionization era.

via Ars Technica|
#early-universe#gravitational-lensing#james-webb-space-telescope
X-Ray Little Red Dot Hints at a Bridge in Early Black Hole Growth
science15 days ago

X-Ray Little Red Dot Hints at a Bridge in Early Black Hole Growth

Astronomers using JWST and Chandra found an unusual X-ray-bright “little red dot” (3DHST-AEGIS-12014) about 11.8 billion light-years away, suggesting it may be a transitional object linking black hole stars to the growth of early supermassive black holes. Its X-ray emission could escape through holes in surrounding gas clouds, explaining variability and offering a potential link between LRDs and SMBHs in the young universe, though further observations are needed to confirm the scenario and its implications for black hole formation.

via Universe Today|
#early-universe#jwst#little-red-dots
X-ray Dot Could Unmask Webb's Little Red Dots
space16 days ago

X-ray Dot Could Unmask Webb's Little Red Dots

A newly analyzed X-ray source, nicknamed the X-ray dot, observed by Chandra and later in JWST fields, may explain the Webb-detected “little red dots” by showing that these early-universe black holes are enshrouded in dense gas that blocks X-rays; as accretion progresses, gaps in the cocoon can form, allowing X-rays to escape and revealing the black hole’s interior. This supports the idea that little red dots are young supermassive black holes in rapid growth, with future observatories like the Roman Space Telescope expected to help find modern analogues and further illuminate black hole evolution in the early universe.

via Live Science|
#chandra-x-ray-observatory#early-universe#james-webb-space-telescope
Ancient Giant Galaxy Lacks Spin, Stuns Astronomers
space18 days ago

Ancient Giant Galaxy Lacks Spin, Stuns Astronomers

Astronomers using the James Webb Space Telescope (MAGAZ3NE) found the massive early-universe galaxy XMM-VID1-2075 with essentially no rotation—a surprising 'slow rotator' for its age less than 2 billion years after the Big Bang—likely due to a past major collision or interactions that canceled angular momentum; researchers are expanding the search for similar spinless galaxies to test current galaxy-formation theories.

via ScienceDaily|
#early-universe#galaxies#james-webb-space-telescope
Behemoth Galaxy From 12 Billion Years Ago Defies Spin, Outnumbers Milky Way in Stars
astronomy19 days ago

Behemoth Galaxy From 12 Billion Years Ago Defies Spin, Outnumbers Milky Way in Stars

The James Webb Space Telescope revealed XMM-VID1-2075, a massive galaxy from about 12 billion years ago with several times more stars than the Milky Way, yet showing no detectable rotation, challenging current ideas about early galaxy dynamics and suggesting a possible single high-energy interaction rather than multiple mergers.

via The Daily Galaxy|
#astronomy#early-universe#galaxy-formation
Early galaxies burned bright with fresh gas, reshaping our cosmic origin story
space22 days ago

Early galaxies burned bright with fresh gas, reshaping our cosmic origin story

New JWST observations and ColdSIM simulations show that the first galaxies in the early universe formed stars at a frantic pace using pristine gas rather than recycling material. The simulations reveal a shift from cold, dense gas to a warm, low-density phase during the epoch of reionization, plus a surprisingly low stellar return fraction. As a result, these infant galaxies depleted their gas quickly, implying a more aggressive, gas‑driven mode of star formation than current models predict. This work reshapes our understanding of cosmic origins and will be tested further by JWST and future facilities like the Square Kilometre Array.

via Space|
#baryon-budget#early-universe#epoch-of-reionization
Tiny Dark-Matter Bursts May Kickstart the Universe’s First Supermassive Black Holes
science22 days ago

Tiny Dark-Matter Bursts May Kickstart the Universe’s First Supermassive Black Holes

A new study proposes that tiny energy bursts from decaying dark matter in the early universe could nudge pristine hydrogen gas clouds to collapse faster, facilitating direct-collapse black holes and potentially explaining the unexpectedly early appearance of supermassive black holes seen by JWST. The model highlights axion-like particles in the 24–27 eV range as the right environment to enable rapid formation.

via The Daily Galaxy|
#axions#black-holes#cosmology
Distant X-ray Dot Could Unveil How Early Black Holes Grew
space24 days ago

Distant X-ray Dot Could Unveil How Early Black Holes Grew

Astronomers using Webb and Chandra detected a faint, compact red source about 11.8 billion light-years away (3DHST-AEGIS-12014) that emits X-rays, unlike most little red dots. This could represent a transitional phase where a rapidly growing black hole is still buried in dense gas, helping link the LRD population to conventional active black holes and refining models of black hole formation in the early universe, though alternative explanations exist and further observations are needed.

via The Daily Galaxy|
#black-holes#chandra-x-ray-observatory#early-universe
Decaying Dark Matter May Have Seeded the Universe's First Supermassive Black Holes
astronomy28 days ago

Decaying Dark Matter May Have Seeded the Universe's First Supermassive Black Holes

Researchers propose that energy from decaying dark matter could heat primordial gas enough to trigger direct-collapse black holes, potentially seeding the universe's first SMBHs earlier than standard growth models. The idea, spurred by JWST observations of massive black holes within the first billion years, pinpoints a 24–27 eV dark-matter particle as a possible energy source and was published in JCAP on April 14.

via Space|
#astronomy#black-holes#dark-matter
Rare Quasar Pair Merges in the Early Universe, Illuminating Black Hole Growth
astronomy28 days 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
Ultra‑Poor Star PicII-503 Illuminates the Universe’s Dawn
science1 month ago

Ultra‑Poor Star PicII-503 Illuminates the Universe’s Dawn

Astronomers have identified PicII-503, an extremely iron-poor Population II star in the ultra-old dwarf galaxy Pictor II, about 150,000 light-years away. Its iron abundance is about 43,000 times lower than the Sun and calcium about 160,000 times lower, while its carbon is vastly enriched, suggesting it formed from gas enriched by the very first stars. As the most iron-poor star found outside the Milky Way, PicII-503 offers a rare glimpse into early nucleosynthesis and the remnants of Population III stars; it was discovered via the MAGIC survey using the Dark Energy Camera and is reported in Nature Astronomy.

via ScienceAlert|
#early-universe#metal-poor#picii-503