Barred spiral galaxy found at z=5.102
JWST imaging reveals a 4.5 kpc stellar bar and spiral arms in a massive disk galaxy only 1.2 billion years after the Big Bang.
· “A massive barred spiral galaxy at z = 5.102 discovered by JWST”
astro-ph
Astrophysics
This paper reports a mean velocity difference of about 0.05 km/s between ions traced by…
Detection of ~0.05 km/s ion-neutral velocity drift in L1544 interpreted as the first observational signature of ambipolar diffusion in a…
Modified gravity changes low-frequency gravitational-wave lensing
A curvature-coupled propagation equation prevents the amplification factor from reaching unity at zero frequency.
· “Wave-optics gravitational wave lensing in modified gravity”
JWST can spot volcanic exomoons that may power super-Jupiter aurorae
A handful of 1.5-day light curves of free-floating worlds could test whether Io-like moons supply their radio plasma.
· “On the Detectability of Volcanic Exo-Ios That May Fuel Auroras on Super-Jupiters”
Convective red-supergiant gas launches wobbling jets in common envelopes
Stochastic angular momentum can exceed the orbital piece by several times, forming intermittent disks around compact stars.
· “Simulating the convection in red super-giant stars: wobbling jets in common envelope evolution”
High-carbon CEMP-no stars are binaries ~50% of the time
Three times the rate of low-carbon twins, a 2σ result that links carbon excess to binary evolution
Gamma-rays rise when X-rays fall in a transitional pulsar
Mode stacking of Fermi-LAT data shows an anti-correlation that rules out bright wind–disk GeV emission.
Peak black-hole kick is 7.4 times the final kick
In relativistic head-on collisions the ratio is nearly independent of spin and momentum
· “Antikick Relation in High-Energy Head-On Collisions of Spinning Black Holes”
Late-time distances deviate 3.5σ from Planck ΛCDM near z=0.47
Model-free reconstruction of DESI BAO and DES supernovae finds a localized expansion-history anomaly that survives method and data swaps.
· “Model-Independent Indication for a Localized Anomaly in the Late-Time Expansion History”
Local Sheet sets Milky Way disk and halo alignment
Constrained simulations show early mergers fix disk spin; later Magellanic accretion twists the outer halo
Microcontrollers replace FPGAs for kilopixel TES readout
picoMUX hits sub-µs row timing at lower cost and power, with no excess noise so far
· “picoMUX: microcontroller based time-domain multiplexing readout for kilopixel TES arrays”
Negative coupling lowers r and reconciles quartic inflation with ACT
Jordan-frame analysis shows ξ ≲ −0.1 puts V=λφ^{4}/4 inside ACT DR6 and Planck contours
· “Models with Non-minimal Coupling in Primordial Universe and Cosmological Observations”
Stabilizing feedbacks can pack climate chaos near freezing
In 35k simulations, chaos triples where negative and positive feedbacks overlap
One in 7000 AM CVn binaries may be multi-messenger targets
New continuum model plus neural inverse recovers masses, period and distance for LISA-era systems
Stratified GRB ejecta alone make afterglow plateaus
High-resolution runs show modest Lorentz factors γ₀ ~ 10–50 suffice in wind and ISM media
· “High-Resolution Numerical Calculations of GRB Afterglow Plateaus arising from Stratified Ejecta”
Neural nets hit 0.002% residual on SED bandpass integrals
Two orders of magnitude faster than optimized exact integration, with a public Python package ready to use
· “Fast and accurate bandpass integration of complex SEDs with neural networks”
Young radio jets leave little cold gas in 3C 303.1
CO non-detection and low gas-to-dust ratio mark AGN heating or removal of molecular fuel
· “SMA Observations of the Archetypal Compact Steep-spectrum Radio Source 3C 303.1”
Cores built 80% of their stars early
At z~0.3, inside-out growth already links high-redshift systems to today's quiet galaxies
Hubble’s IR camera still dims ~0.07% a year
New cluster photometry through 2026 revises earlier loss rates downward after persistence fixes.
· “Updates to the WFC3/IR Photometric Stability Stellar Cluster Study”
~45–50 μHz X-ray period found before eclipse in NGC 6814
Signal stretches during the eclipse, pointing to covering changes or a truncated inner flow
· “Investigating the Periodic X-ray Behaviour in the Eclipsing AGN NGC 6814”
Open-source stack runs six telescopes unattended since 2024
Sub-arcsecond guiding and near-zero plate-solve failures with no message broker
· “Astra: an open-source fully autonomous robotic observatory control software”
Coarse angle grids make supernovae explode
Resolution choices in Boltzmann neutrino transport can flip explosion outcomes and delay black-hole formation
SKAO radio maps will test ΛCDM with systematics optical data cannot share
Independent radio systematics let multi-probe combinations calibrate errors and probe the largest cosmic scales
17 TESS stars show flare-rate changes that look like activity cycles
A G-type superflare star is the clearest solar-like case among rapid rotators.
· “Searching for Stellar Activity Cycles using Flares II: The TESS CVZ”
K 1-6 is photoionised ISM, not a planetary nebula
A 1–2 Myr white dwarf lights ambient gas in a hierarchical triple with an active K star
· “K 1-6 is a photoionised ISM nebula shaped by a fast-moving hot white dwarf in a triple system”
IQU plus wave speeds recover coronal B like full Stokes IQUV
Hybrid inversions match classical spectropolarimetry without needing circular polarization
VLTI shows WR 25 is a hierarchical triple with 93-solar-mass core
Inner WN6ha+O5 binary masses fixed at 62 and 31 solar masses; coeval O7 tertiary at 28 mas
· “Southern massive stars at high angular resolution: WR 25 is a massive hierarchical triple system”
How MICADO plans to stay online for ten ELT years
FMECA forces modular design, derated cryo motors and predictive torque monitoring to cut downtime risk
Relaxed cluster A1795 still hides a sloshing spiral and weak shock
Deep EP-FXT maps out to R_200 show dynamical fossils left by a binary merger.
· “EP-FXT Observations of Abell 1795: X-ray Properties and Structure out to R₂₀₀”
Supernova neutrinos amplify molecular handedness past 10 percent
Parity-violating bias plus autocatalysis and noise can seed the excess seen in meteorites
· “Supernova Neutrinos and the Origin of Biomolecular Homochirality”
Sparks halve the methane-to-CO ratio in brown dwarfs in a microsecond
Electron energies of just 3 eV open non-thermal pathways that reshape near-infrared spectra across the L/T transition.
Three new extended gamma-ray sources found by clustering Fermi points
Eight clusters prefer a single extended model; three have no match in existing catalogs
Broadband KAGRA beats high-frequency for multimessenger event counts
Rate-aware metric shows adding KAGRA still lifts well-localized BNS events by ~60%
· “Evaluating KAGRA upgrade scenarios for multimessenger observations of binary neutron stars”
Genetic algorithm builds fairer review panels than random draws
Four imbalance scores—expertise, gender, country, seniority—drive evolution toward balanced ESO-style panels.
GA hunt finds only tiny late-time f(R) deviations from ΜDM
Viable Hu-Sawicki-like models stay close to standard cosmology under DESI BAO and Pantheon+ data
· “Exploring Hu-Sawicki-like modified gravity with Genetic Algorithms”
Genetic algorithm tunes internal-shock model to real GRB light curves
Optimised shells follow Zipf counts and exponential launch times, matching six key observables
Neural net maps neutron-star mass-radius data straight to dense-matter EoS
Physics-informed invertible network cuts high-density uncertainty ~10% and flags best future NICER targets
Galactic perturbers rarely scramble black-hole binary eccentricity
Only the heaviest substructures raise scatter above Poisson noise, leaving the PTA background largely unaffected
· “Perturber-Driven Dynamics of Supermassive Black Hole Binaries in Galaxy Merger”
Quenching tracks velocity-curve shapes from slow-rising to sharp-peaked
Fully retired galaxies show more centrally peaked curves and higher outer speeds than star-forming ones
One diffusion model fits SN 2024aecx's double peak
Steep outer envelope of slope ~13.3 plus extra late optical suppression needed for the rapid decline
Only three of 339 Gaia symbiotic candidates hold up
A classifier and spectra show most new DR3 labels are pulsating giants, so the Galactic shortfall remains
Satellite calibrator aims to fix CMB polarization systematics by 2030
A shared artificial source on a geostationary platform would give ground telescopes an absolute polarization reference sky methods cannot.
· “Status and future development of the COSMOCal Project for absolute CMB polarization calibration”
Round dwarfs sit in stronger tides and move more slowly
Virgo dEs split by shape show tidal grinding may turn flat systems into round spheroids.
· “Tidal Grinding of Dwarf Galaxies in Cluster Environments”
Four 8 m telescopes could give VLTI ALMA-like imaging for ~80 M€ each
Compact f/0.64 design plugs into existing infrastructure and densifies baselines to 220 m
· “ngVLTI: Cost and Feasibility of a Four-Telescope VLTI Expansion for Milliarcsecond-Scale Imaging”
Gaia DR3 maps known symbiotic binaries and flags which data can be trusted
Astrometry and Hα work; temperatures and metallicities do not. DR4 should enlarge the map.
· “Symbiotic binaries in the Gaia data. I. Known symbiotics in DR3 and FPR”
Lambdas barely slow heat flow in neutron-star cores
Neutron conductivity drops only slightly, so core cooling times stay almost the same
· “Thermal conductivity of dense npΛ matter in neutron star cores”
Star hits 25,000 km/s near Sgr A* and feels its spin
Faint 8.7-year orbit S301 brings Kerr-order effects within reach of current interferometry.
GPs recover disk dust profiles free of ALMA beamsize bias
Auto-differentiable visibility modeling on HD 169142 reveals new radial complexity
Red-giant magnetism runs without differential rotation
Mean-field models match 3D growth rates and disfavour a long-lived fossil field.
· “Mean-field interpretation of star-in-a-box simulations of red giants”
ML flags neutrino flavor-crossing sites from electron moments alone
Models generalize across most unseen compact-object datasets and map where heavier flavors still matter
· “Machine Learning Detection of Non-Axisymmetric Fast Flavor Instabilities in Compact Objects”
Two Type Ic supernovae: one transitional
Arnett fits give concrete ejecta masses and energies that widen the known range of stripped-envelope explosions
· “Photometric and Spectroscopic Studies of Type Ic Supernovae SN 2020akf and SN 2021mxx”
Concentric pupils recover LGS uplink tip-tilt from the launch telescope
Aperture-size diversity plus LMMSE leaves 24–34 mas residual error without a natural guide star.
· “Estimation of the laser guide star uplink tip-tilt using aperture size diversity”
Marsquakes split into three classes
Spectral amplitude and decay separate tectonic, impact and non-tectonic swarm events across the full InSight catalog.
· “Discrimination of Tectonic, Swarm and Impact-related Marsquakes using Spectral Characteristics”
Photonics cut WST spectrograph mass from 140 t to 200 kg
Conventional MOS scales as N_ch^0.8; AWG chips grow only as R^1–1.5, for a 6–15 imes cost drop.
Neutrino limits push asteroid-mass PBH dark matter to 10^{-7}
Borexino, KamLAND and Super-K constrain boson clouds around spinning primordial black holes more tightly than microlensing.
· “Neutrino superradiance constraint on asteroid-mass PBH Dark Matter and beyond”
Disk rewrite cuts limb-darkening microlensing cost to ~30%
High-order quadrature now scales faster than N^{-4}, making precise source models cheap for any lens.
· “A Fast Concentric-disk Contour Integration Method For Microlensing Limb-darkening Effect”
Orbiting black holes spin up counter-rotating disks from gas shear
Bondi-sphere advection injects angular momentum; disks form in a tenth of an orbit
· “Accretion-disk formation around orbiting stellar black holes in gaseous star clusters”
Galaxy polarization maps measure axion coherence length
A turnover in the three-dimensional rotation correlation yields m_a v_a for ultralight ALPs
· “Measuring Ultralight-Axion Coherence with Galaxy Polarization Correlations”
Diffuse radio found in 46 of 400 nearby galaxy groups
Emission sits above cluster scaling laws, pointing to fossil plasma and mergers in low-mass systems
PTAs recover three SMBHB population coordinates in simulations
Frequency data and higher strain moments map residence time, normalization and the high-mass cutoff with ~0.9 fidelity.
kHz imaging with sub-electron noise headed for Magellan
Single-photon CMOS and APD arrays aim to open multicolor and polarimetric regimes at high cadence
Light-focusing parameter α(z) reads two ways: dark energy or lensing
A sky-isotropy test at fixed redshift can break the degeneracy without other cosmological probes
· “Ricci Focusing Degeneracy between Dynamical Dark Energy and Matter Inhomogeneity”
Interferometer flux recovery is just an error function of scale
A scale-space decomposition predicts filtered images without visibility simulations
· “Demystifying image-recovery from radio interferometers: toward a multiscale predictive model”
IPS flags compact sources
18% of bright ASKAP sources are highly compact; FLASH detects associated and intervening absorption against them.
Cool gas stripped near cluster cores
DESI stacks of a million quasars reveal a dual environmental signature around bright cluster galaxies at z≈0.55.
· “Environmental Imprints on the Assembly of the Cool Gas around Bright Cluster Galaxies”
Disharmonized harmonics pin Blazhko effect to varying convection
Kepler data on V783 Cyg link anti-correlated harmonic amplitudes to envelope turbulence that regulates pulsation.
· “Pulsation harmonics reveal the origin of the century-old Blazhko effect”
Magnetic starquakes can make pulsars slow down as well as speed up
A simple field-strength scaling matches both glitches and the anti-glitches seen in magnetars
Dark energy may feed dark matter—but only at 1.5 sigma
DESI + supernovae prefer energy flow into dark matter; Bayesian odds still back ΛCDM
· “Testing the Direction of Dark Sector Interaction Using Late-Time Datasets”
Potential-free warm k-inflation hits Planck with tiny r
Thermal damping plus nonminimal kinetic coupling yields an exponential attractor and sub-Planckian fields
· “Dynamics of potential-free warm k-inflation with nonminimal derivative coupling”
Ground scope misses Euclid's Einstein ring at the seeing limit
Eight hours on a 1.5-m telescope leave no detectable residual when θ_E equals the FWHM
· “Testing the recovery of the NGC 6505 Einstein ring in deep OSN 1.5-m imaging”
Pulse timing, not just total CO2, sets ocean carbon spikes
A Goldilocks zone of intermediate pulse lengths triggers the most repeated large transients in an excitable carbon-cycle model.
· “Modeling the response of the marine carbon cycle to extreme CO₂ injection events”
Multi-probe quantum sensors exclude ALP couplings to 10^{-7}
Position-dependent spin sensors lift the Fisher-matrix singularity and set laboratory bounds for masses below 10^{-3} eV
Differentiable gas models recover moderate Milky Way bar speeds
CO longitude-velocity maps yield broad low-loss regions near 30-40 km/s/kpc, matching stellar constraints
Gaia can probe scalar dark matter clumps at percent level
Three local probes bound ultralight scalar clumps, clock couplings, and microlensing lenses.
JWST finds a z~4.4 arc candidate near a cluster critical curve
Six-band photometry and an independent lens model put A1 at median magnification ~7.
Cheap μs/ms laser beacons could be the preferred interstellar signals
A low-cost survey with high-speed detectors and hybrid lenses could constrain them within 20 parsecs.
· “The Interstellar Laser Beacons Hypothesis and the Cosmic Lighthouses Project”
π Men c’s period now known ten times better
Six years of TESS and 22 years of RVs pin a 13–20 Earth-mass window for a possible π Men d.
Simulated M82 winds underproduce X-rays by 50–100×
Even high-resolution SN-driven runs yield spectra that are too soft and surface brightness that falls off too fast.
· “Illuminating M82: Simulating X-ray Emission from Galactic Winds in a Starburst Galaxy”
Microlensing finds a 10-Jupiter-mass planet at the edge of a mass-ratio desert
The host is a half-solar-mass star at 5 kpc; the companion sits beyond the snow line near q=0.02.
Mid-radio light tracks galaxy star formation across cosmic time
Dust-free 1–10 GHz luminosity and evolving SED shape become robust SFR tools, with SKA AA4 next.