Self-consistent simulations reveal that reverse shocks in GRB photospheres stay radiation-mediated down to optical depths of a few tenths, with photons decoupling over a broad radial range and forming a quasi-thermal post-cursor.
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- background 10.3390/atoms13060052. [29] F.A. Jenkins, E. Segr` e. Phys. Rev.,55, 52 (1939). DOI: 10.1103/PhysRev.55.52. [30] L.I. Schiff, H. Snyder. Phys. Rev.,55, 59 (1939). DOI: 10.1103/PhysRev.55.59. [31] G.W. Preston. Astrophys. J.,160, L143 (1970). DOI: 10.1086/180547. [32] S.B. Kemic. Astrophysics and Space Science,36, 459 (1975). DOI: 10.1007/BF00645268. [33] C. Moran, T.R. Marsh, V.S. Dhillon. Monthly Notices of the Royal Astronomical Society,299, 218 (1998). DOI: 10.1046/j.1365-8711.1998.01763.x. 1
- background It is well known that capturing key physics in the synthetic models - from stellar energetics and spectra, and in particular the treatment of the thermally puls- ing asymptotic-giant-branch (TP-AGB) phase - is key to avoid systematic uncertainties in the derived galaxy physical parameters. TP-AGB stars dominate the NIR light of intermediate-age stellar populations (∼0.2-2 Gyr) in C. Maraston (1998, 2005) evolutionary population synthe- sis models, producing numerous NIR features, including molec
- background The characteristic granule lifetime is estimated as Tgra ≈ dgra σ1D ≈2.9m −1 22 σ1D 100 km s−1 −2 Myr.(27) The dynamical effects of these density fluctuations can be modeled by treating FDM granules as quasiparticles (Bar-Or et al. 2019; El-Zant et al. 2020; Cha- vanis 2021; Dutta Chowdhury et al. 2021). Assuming a Maxwellian velocity distribution, the effective particle mass is Mgra ≈ πρd3 6 ,(28) whereρdenotes the local dark matter density. The granule size remains approximately constant in
- background 2025). Moreover, under the same approximation, the baryonic inflow rate is expressed as ˙Mb ≃144M ⊙ yr−1fb,0.16T 3/2 vir,6 1 +z 10 ,(6) whereT vir,6 =T vir/(106 K) is the normalized halo virial temperature. Therefore, if the gas supply feeds the nu- clear region of a massive halo with a virial temperature ofT vir,6 ≃1, this rate corresponds to∼ O(100)× ˙MEdd for a BH withM BH ≲10 7 M⊙. Such an inflow is sufficient to confine ionizing radiation from the central AGN through efficient radiative
- method thusζhas to transform likeζ→ζ−αin order for the pro- jected shear to stay invariant. The polar angles transform like φi →φ i −αand therefore the coefficients need to satisfy the identitya 1 +a 2 +a 3 =1. The choice forζis arbitrary, as long as it meets the two conditions above. Choosing another projection angleζ ′ = a′ 1φ1 +a ′ 2φ2 +a ′ 3φ3 changes the 4PCF only by the phase factor e2i(ζ′−ζ) =e 2i[(a1−a′ 1)ϕ12+(a′ 3−a3)ϕ23]. Throughout the following work, Article number, page 4 of 19 Jonathan Oe
- background (a) Detected filaments around Abell 2744. The dashed green circles mark radii of 1, 2.2, and 3.4 Mpc, respectively. The red (cyan) arrows indicate the best-fit directions measured in the inner (outer) annulus. The shaded regions represent the 16th-84th percentile ranges from 1000 bootstrap realizations. The white contours show the reconstructed WL mass map atκ= [0.12,0.24,0.36,0.48,0.6,0.7]. The yellow circles mark cluster member galaxies. The magenta star denotes the reference point adopted for
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representative citing papers
First near-IR weak-lensing analysis of CANDELS fields detects 12 shear-selected overdensities with masses 0.2-2.2 x 10^14 solar masses at redshifts 0.22-0.9 and mean z=0.68.
A neural network trained on simulations infers stripping times for Sagittarius stream stars from phase-space data, measuring a 0.3 dex/Gyr metallicity gradient and estimating ages for globular clusters such as Pal 12 and NGC 2419.
Spectroscopic members of the M92 stream yield a Milky Way bar pattern speed of 29.1 +0.7/-0.4 km s^{-1} kpc^{-1}.
The authors derive the fourth-order galaxy-galaxy lensing 4PCF and aperture statistics, implement a numerical pipeline and FFT estimator, and detect the connected ⟨N³ M_ap⟩ signal at SNR ~9 in stage IV mock data over 2000 deg².
J1105+1452 transitioned to a megahertz peaked-spectrum source with a new compact jet of radius ~0.68 pc, apparent velocity ~0.64c, and Doppler factor ~12, while X-ray emission stayed disk-corona dominated.
Spectroscopic and imaging confirmation of the brightest known quadruply-lensed quasar J1330-0905 at z=2.22 with Einstein radius ~0.45 arcsec and predicted magnification ~56.
XRISM spectroscopy of AM Herculis reveals bulk velocity and temperature gradients in the radiative cooling accretion column, with derived shock temperature of 24 keV, velocity of 1116 km/s, and density of 5-6 x 10^15 cm^-3.
In LambdaCDM simulations, over 90% of subhalo sinking events occur between adjacent hierarchy levels, satellite-satellite mergers can rival central-satellite rates at low masses, and the overall merger landscape deviates from self-similarity.
RRATs number up to 400000 in the Galaxy with a birth rate of at most 1.4 per century, comparable in size to pulsars at high luminosities and consistent with supernova rates.
Two new short-period asynchronous magnetic cataclysmic variables were found, one candidate at the period minimum with spin-to-orbit ratio 0.9879 and an eclipsing system with ratio 0.867, supporting magnetic synchronization predictions.
Fe Kα lines from accreting black holes are produced mostly outside 10 gravitational radii due to radial ionization gradients, allowing broad profiles without high spin.
Discovery of extended GeV gamma-ray emission from AFGL 490, with the protostellar jet identified as the likely particle accelerator rather than stellar winds.
Low-luminosity FRII radio galaxies show higher core prevalence, comparable hotspots, and ~32% restarting/remnant behavior compared to bright FRIIs, revealing a highly diverse population where FRII dynamics occur at low powers.
Lagrangian tracers show mixing with low-entropy seeds drives most condensation in cluster cores; magnetic fields cause earlier divergence, higher vorticity, lower Mach numbers, and slower cold-cloud motion via tension.
JWST data show massive quiescent galaxies in high-redshift proto-clusters formed and quenched simultaneously, with AGN signatures, indicating environmental triggering of quenching.
Pulsational mass loss from supermassive stars ejects discrete shells that form the compact dense gas cocoons observed in Little Red Dots.
Plasma lensing models show that outer and inner caustics plus arclet brightness patterns in pulsar scintillation can constrain substructure column density gradients, sizes, and amplitudes.
A new stepwise 2D tracing method resolves inconsistencies in weak-lensing detection of curved intracluster filaments in Abell 2744 that global matched-filter scans cannot handle.
A new main-sequence evolution framework implemented in COMPAS yields more massive helium cores, more compact stripped-star radii, and systematically higher black-hole masses than standard prescriptions.
Milky Way-mass dark matter density profiles in IllustrisTNG are largely insensitive to astrophysics and cosmology variations, dominated by halo-to-halo variance instead.
Morphological metrics in galaxy images suffer systematic biases from resolution, depth, and noise that can be quantified and corrected empirically, with new metrics proposed to reduce those effects.
Coevolving super-Eddington black holes and nuclear starbursts in high-redshift halos naturally generate the V-shaped UV-to-optical spectra and weak high-energy emission of little red dots.
Low-mass filament galaxies in TNG50 exhibit smaller asymmetric cold gas discs due to cosmic web tidal fields causing altered accretion or starvation and late-time stripping, while integrated stellar and halo properties remain similar to field counterparts after mass and environment controls.
citing papers explorer
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From Internal Collision to Photon Escape: First-Principles Modeling of Radiation-Mediated Shocks in Gamma-Ray Burst Photospheres
Self-consistent simulations reveal that reverse shocks in GRB photospheres stay radiation-mediated down to optical depths of a few tenths, with photons decoupling over a broad radial range and forming a quasi-thermal post-cursor.
-
Near-IR Weak-lensing (NIRWL) Measurements in the CANDELS Fields. II. Mass Mapping and Overdensity Characterization
First near-IR weak-lensing analysis of CANDELS fields detects 12 shear-selected overdensities with masses 0.2-2.2 x 10^14 solar masses at redshifts 0.22-0.9 and mean z=0.68.
-
Reconstructing the Stripping History of the Sagittarius Stream with Neural Networks
A neural network trained on simulations infers stripping times for Sagittarius stream stars from phase-space data, measuring a 0.3 dex/Gyr metallicity gradient and estimating ages for globular clusters such as Pal 12 and NGC 2419.
-
Constraining the Galactic bar using the M92 stellar stream
Spectroscopic members of the M92 stream yield a Milky Way bar pattern speed of 29.1 +0.7/-0.4 km s^{-1} kpc^{-1}.
-
Fourth-order galaxy-galaxy-lensing: Theoretical framework and direct estimation
The authors derive the fourth-order galaxy-galaxy lensing 4PCF and aperture statistics, implement a numerical pipeline and FFT estimator, and detect the connected ⟨N³ M_ap⟩ signal at SNR ~9 in stage IV mock data over 2000 deg².
-
A Radio Changing-state Jet in the Narrow-line Seyfert 1 Galaxy J1105+1452
J1105+1452 transitioned to a megahertz peaked-spectrum source with a new compact jet of radius ~0.68 pc, apparent velocity ~0.64c, and Doppler factor ~12, while X-ray emission stayed disk-corona dominated.
-
Persephone's Torch: A 15th Magnitude Quadruply-Lensed Quasar From the Couch Discovered with SPHEREx and the LBT
Spectroscopic and imaging confirmation of the brightest known quadruply-lensed quasar J1330-0905 at z=2.22 with Einstein radius ~0.45 arcsec and predicted magnification ~56.
-
Plasma Dynamics of Radiative Cooling Accretion Flow in AM Herculis with XRISM
XRISM spectroscopy of AM Herculis reveals bulk velocity and temperature gradients in the radiative cooling accretion column, with derived shock temperature of 24 keV, velocity of 1116 km/s, and density of 5-6 x 10^15 cm^-3.
-
The Broken Similarity: Sinking and Merging of Dark Matter Subhalos Across Hierarchical Levels
In LambdaCDM simulations, over 90% of subhalo sinking events occur between adjacent hierarchy levels, satellite-satellite mergers can rival central-satellite rates at low masses, and the overall merger landscape deviates from self-similarity.
-
The RRATalog: a Galactic census of rotating radio transients
RRATs number up to 400000 in the Galaxy with a birth rate of at most 1.4 per century, comparable in size to pulsars at high luminosities and consistent with supernova rates.
-
TESS light curves of two new magnetic cataclysmic variables: an asynchronous polar at the period minimum, and an eclipsing system with a large spin-to-orbit ratio
Two new short-period asynchronous magnetic cataclysmic variables were found, one candidate at the period minimum with spin-to-orbit ratio 0.9879 and an eclipsing system with ratio 0.867, supporting magnetic synchronization predictions.
-
Simulation-Based Prediction of Black Hole Fe K$\alpha$ Line Profiles
Fe Kα lines from accreting black holes are produced mostly outside 10 gravitational radii due to radial ionization gradients, allowing broad profiles without high spin.
-
GeV {\gamma}-ray emission in the low-mass star-forming region AFGL 490
Discovery of extended GeV gamma-ray emission from AFGL 490, with the protostellar jet identified as the likely particle accelerator rather than stellar winds.
-
The diverse morphologies and evolution of low-luminosity edge-brightened radio galaxies
Low-luminosity FRII radio galaxies show higher core prevalence, comparable hotspots, and ~32% restarting/remnant behavior compared to bright FRIIs, revealing a highly diverse population where FRII dynamics occur at low powers.
-
XMAGNET -- Stir before serving: a Lagrangian perspective on mixing-driven condensation in the intracluster medium
Lagrangian tracers show mixing with low-entropy seeds drives most condensation in cluster cores; magnetic fields cause earlier divergence, higher vorticity, lower Mach numbers, and slower cold-cloud motion via tension.
-
DeepDive: Simultaneous Formation of Massive Quiescent Galaxies in High-Redshift Galaxy Proto-clusters
JWST data show massive quiescent galaxies in high-redshift proto-clusters formed and quenched simultaneously, with AGN signatures, indicating environmental triggering of quenching.
-
Pulsational mass loss from supermassive stars creates the compact shells of Little Red Dots
Pulsational mass loss from supermassive stars ejects discrete shells that form the compact dense gas cocoons observed in Little Red Dots.
-
Plasma lensing modeling of substructures on pulsar scintillation screens
Plasma lensing models show that outer and inner caustics plus arclet brightness patterns in pulsar scintillation can constrain substructure column density gradients, sizes, and amplitudes.
-
Weak-lensing Analysis of Intracluster Filaments in Abell 2744: Matched-filter Scans and Stepwise 2D Tracing
A new stepwise 2D tracing method resolves inconsistencies in weak-lensing detection of curved intracluster filaments in Abell 2744 that global matched-filter scans cannot handle.
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Evolution of Massive Main-sequence Stars in Rapid Population Synthesis. I. Framework and Implementation
A new main-sequence evolution framework implemented in COMPAS yields more massive helium cores, more compact stripped-star radii, and systematically higher black-hole masses than standard prescriptions.
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The DREAMS Project: Disentangling the Impact of Halo-to-Halo Variance and Baryonic Feedback on Milky Way Dark Matter Density Profiles
Milky Way-mass dark matter density profiles in IllustrisTNG are largely insensitive to astrophysics and cosmology variations, dominated by halo-to-halo variance instead.
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statmorph-lsst: Quantifying and correcting morphological biases in galaxy surveys
Morphological metrics in galaxy images suffer systematic biases from resolution, depth, and noise that can be quantified and corrected empirically, with new metrics proposed to reduce those effects.
-
Spectral Uniformity of Little Red Dots: A Natural Outcome of Coevolving Seed Black Holes and Nascent Starbursts
Coevolving super-Eddington black holes and nuclear starbursts in high-redshift halos naturally generate the V-shaped UV-to-optical spectra and weak high-energy emission of little red dots.
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Cosmic web stripping and starvation of low-mass filament galaxies in TNG50
Low-mass filament galaxies in TNG50 exhibit smaller asymmetric cold gas discs due to cosmic web tidal fields causing altered accretion or starvation and late-time stripping, while integrated stellar and halo properties remain similar to field counterparts after mass and environment controls.
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A Weak Fe K$\beta$ Emission Line in the Broad-Line Radio Galaxy 3C 111 Observed with XRISM: An Ionized Wind Absorption Feature?
XRISM observation of 3C 111 finds weak Fe Kβ possibly caused by blueshifted absorption from an ionized wind at 4600 or 17200 km/s, with kinetic power 10^41-10^44 erg/s smaller than the jet power.
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Powerful Radio Sources in the Southern Sky. IV. Observations of the G4Jy-3CRE Catalog with the Australian Square Kilometre Array Pathfinder
New ASKAP continuum imaging classifies jet morphologies in 173 G4Jy-3CRE sources (66% of sample) including 37 newly detected jets and identifies six new optical counterparts.
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Euclid preparation: Testing multi-field inflation with galaxy power spectrum and bispectrum
Validates redshift-space power spectrum and bispectrum analysis on Abacus-PNG mocks to recover unbiased f_NL constraints for Euclid spectroscopic sample.
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Difference Between Half-mass Radius and Half-light Radius of Galaxies at 0.2 $< z <$ 2.5 Revealed by JWST/NIRCam Data
JWST data shows half-light radii larger than half-mass radii in galaxies at 0.2<z<2.5, with mass-dependent differences, steeper size-mass slopes for light, and faster mass-size growth for star-forming galaxies at high redshift.
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On the correlation between globular clusters and the distribution of dark matter in galaxy clusters: the case of Abell 2744
Bright globular clusters in Abell 2744 trace the three main mass clumps and match weak-lensing mass maps more closely than other galactic components, using a Poisson point process model.
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COSMOS-Web: Star formation along the early Hubble sequence and the evolution of dust over the redshift range 0<z<12
Stacking analysis shows mean SFR in massive galaxies at 2<z<4.5 declines along the Hubble sequence from ~280 M⊙/yr in irregulars to ~80 M⊙/yr in spheroids, with a simple chemical evolution model explaining the rise in dust-to-stellar mass ratio out to z~8.
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Faraday Complexity and Depolarization in LOFAR Two-metre Sky Survey (LoTSS-DR2) Polarized Radio Sources
Multi-component modeling of 1565 LoTSS-DR2 sources shows 43% have complex Faraday structure, external dispersion dominates in 54%, and rest-frame dispersion correlates positively with redshift in external and mixed populations.
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Bulgeless Evolution And the Rise of Discs (BEARD) I. Physical drivers of the mass-size relation for Milky Way-like galaxies
Bulgeless galaxies trace the upper envelope of the mass-R1 relation with scatter driven by central stellar density and the spatial configuration of mergers rather than their number.
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Exploring the Transitional Parameter Space of Blazars using Gamma-ray and X-ray Population Diagnostics
Changing-look blazars occupy intermediate regions in gamma-ray and X-ray parameter spaces but lie statistically closer to flat-spectrum radio quasars than to BL Lac objects according to centroids, PCA, UMAP, and random-forest classification.
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Jet-Structure Imprint on the Curvature Tail of Gamma-Ray Burst Prompt Emission
Numerical modeling shows GRB 230307A's late-time prompt emission break is best reproduced by a jet with uniform core of 0.0147 rad and power-law wings, unlike simpler spherical or top-hat models.
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When Magnetic Fields Sculpt the Sky: The Riegel-Crutcher cloud in optical polarization
New optical polarization data of over 90,000 stars shows H I filaments in the Riegel-Crutcher cloud tightly aligned with a coherent plane-of-sky magnetic field, indicating magnetic fields shape the cold neutral medium.
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On the origin of the environmental step: A BayeSN view of the ZTF SN Ia DR2
BayeSN analysis of ZTF Type Ia supernovae confirms a ~0.1 mag intrinsic environmental step in standardized brightness that is not explained by differences in dust extinction properties.
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Predicting the thermodynamics in the chromosphere from the translation of SDO data into the IRIS$^{2}$ inversion results using a visual transformer model
A visual transformer model trained on IRIS inversions predicts chromospheric temperature and density from SDO data with correlations around 0.8 on 80% of test cases.
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The January 2010 flare of Mrk421: Insights from a stochastic acceleration model
The January 2010 flare of Mrk421 shows spectral variability consistent with stochastic acceleration, including development of a Maxwellian pile-up component in the particle distribution on three nights.
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Fast-Cooling Synchrotron in Decaying Magnetic Fields: Implications for the GRB Spectral Distribution
Decaying magnetic fields in fast-cooling synchrotron emission partially harden the low-energy index but still produce a distribution centered near α ≈ −1.5, falling short of reproducing the observed GBM catalog at the population level.
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Very Long Baseline Interferometry Search for Nuclear Radio Continuum Emission in the Barred Spiral Galaxy NGC 7479
VLBI observations resolve NGC 7479's nucleus into two radio components separated by ~30 mas with an apparent change in separation over a decade, suggesting relativistic jet motion or nuclear wind shocks.
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Stellar feedback SPICEs up [C II] emission in the first galaxies
Simulations find [C II] traces star formation robustly but underestimates outflow speeds and mass-loading factors by factors of 2-5, with feedback type affecting disk settling but not distinguishable from [C II] spatial or spectral properties alone.
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Investigating the formation channel of GW231123: Population III stars or hierarchical mergers?
Coupled cosmological and cluster simulations show isolated binary evolution cannot produce GW231123-like mergers at the observed redshift, while hierarchical mergers in globular clusters can, yielding a local rate of 0.78 Gpc^{-3} yr^{-1} peaking at z=4-6.
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Constraining the Pulsar Beaming Fraction with TeV-Selected Galactic Pulsar Wind Nebulae and unidentified TeV Sources
TeV-selected PWNe and unidentified sources yield beaming fractions of 0.1-0.3 across radio, gamma-ray, and X-ray bands, with survey-to-survey differences explained by selection biases or older pulsars and reproducible via time-dependent opening angles.
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Oblique Shocks at Supernova Remnants in Massive Star Clusters: A Model for the Cosmic-Ray Knee Observed by LHAASO
Oblique shocks in massive star clusters accelerate cosmic rays to multi-PeV energies, reproducing the LHAASO-observed knee as a sequence of rigidity-dependent cutoffs from combined supernova and wind shocks.
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A Unified Model for Shock Interaction and $\gamma$-Ray Emission in Classical Novae
A toy model of reverse shocks in novae predicts GeV gamma rays near optical peak and potential TeV emission later, consistent with Fermi observations under an empirically thin post-shock layer.
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Adiabatic Mass Loss In Binary Stars. VI. Massive Helium Binary Stars
Adiabatic mass-loss models for massive helium stars give critical mass ratios 0.7-3.0 on the main sequence and 1.5-27 on the Hertzsprung gap, lowered by winds and adjusted by isotropic re-emission.
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Weak-Lensing Analysis of the Galaxy Cluster Abell 85: Constraints on the Merger Scenarios of Its Southern Subcluster
Weak-lensing analysis of Abell 85 resolves three substructures and finds a ~2:1 mass ratio between the main cluster and southern subcluster, indicating a major ongoing merger.
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The Chicago Carnegie Hubble Program: Improving the Calibration of SNe Ia with JWST Measurements of the Tip of the Red Giant Branch
JWST TRGB distances to 10 SN Ia hosts update calibrations for 11 SNe yielding H0 of 68.4-69.6 km/s/Mpc and show modest shifts when combined with prior HST data.
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Relativistic ions with power-law spectra explain radio phoenixes
Relativistic ions with power-law spectra produce secondary e± that explain the curved radio spectra of phoenixes in galaxy clusters, fitting data better than aged-electron models with three parameters.
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Self-consistent modelling of the Milky Way's Nuclear Stellar Disc
Axisymmetric self-consistent models fitted to NSD kinematic data yield a mass of 1.05 x 10^9 solar masses, radial scale length ~89 pc, vertical scale ~28 pc, and declining velocity dispersion.