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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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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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.
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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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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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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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Variable dust emission by WC type Wolf-Rayet stars observed in the NEOWISE-R survey
NEOWISE-R data identifies ten new non-variable dust makers among WC stars (including three early subtypes), six new episodic dust makers, and revises the dust formation period of HD 36402 to 5.1 years.
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On the origin of variability in $\alpha$ Cygni variable $\epsilon$ Ori (HD 37128) using TESS observations and modelling
Linear stability analysis and non-linear hydrodynamical simulations link the stochastic low-frequency variability of ε Ori to strange-mode instabilities that excite finite-amplitude pulsations.
- A Systematic NLTE Study of Very Metal-Poor Stars with Metallicity Down to $-4.3$ dex. II. Lithium Abundance and New Insight to the Lithium Plateau