857 papers
This paper analyzes long-term archival X-ray data of the jetted Tidal Disruption Event Swift J1644+57 to demonstrate that its soft and hard X-ray emissions originate from a single coronal source, revealing a temporal evolution where the corona rapidly expands during the initial jet-launching phase before settling into a saturated state with minor fluctuations.
Using high-resolution simulations, this study reveals that kinetic energy dissipation in subsonic turbulence is vorticity-dominated, localized on small scales, and lags energy injection by approximately 1.64 turnover times, whereas supersonic dissipation is density-correlated, spans multiple scales via shocks and vorticity, and lags by only 0.48 turnover times, with distinct fractal structures identified in both regimes.
This paper introduces NEST, a model-driven deep learning framework that rapidly estimates stellar ages for over 1.3 million stars across multiple evolutionary grids with high accuracy and a 60,000-fold speedup compared to traditional Bayesian methods, thereby enabling large-scale galactic archeology studies.
This paper utilizes new ASKAP radio polarimetry data alongside archival multiwavelength observations to characterize the complex morphology and highly ordered magnetic field of the supernova remnant G309.8-2.6, revealing an extended relic pulsar wind nebula and proposing scenarios to explain its peculiar S-shaped structure.
This paper reports the first on-sky demonstration of dual-field interferometry at the CHARA Array, which successfully resolved the inner Ba-Bb subsystem of Piscium to determine precise dynamical masses for the near-twin F-type stars and validated the facility's capability for sub-mas astrometry on arcsecond-scale binaries.
By extrapolating statistical relationships between flare ribbon areas and energy from modern observations to the largest recorded sunspot group (April 1947), this study empirically estimates that the Sun is capable of producing flares with bolometric energies reaching a few times 10^34 erg, comparable to superflares observed on other Sun-like stars.
Using a machine-learning-enhanced CatNorth quasar catalog and Planck CMB lensing data, this study derives low-redshift measurements that are generally consistent with the standard CDM model, thereby showing reduced evidence for the persistent tension compared to previous weak lensing results.
This paper introduces the STRIPE Monte Carlo framework to demonstrate that relativistic, high-amplitude turbulence drives intermittent particle acceleration capable of producing the hard TeV-PeV gamma-ray spectra observed in LHAASO-detected microquasars, offering a more realistic alternative to traditional Fermi-II models.
This paper presents a data-driven method using Non-negative Matrix Factorization to accurately estimate spectroscopic redshifts for MUSE galaxy spectra with a 93.7% success rate, while also enabling the separation of true sources and detection of blended objects.
Using GPU-accelerated N-body simulations with a new pebble accretion module, the authors demonstrate that wide-orbit giant planets can form from streaming-instability-derived planetesimals regardless of their initial radial distribution, as rapid dynamical scattering and pebble flux filtering drive core growth while naturally producing scattered discs and rare giant impacts within the first 100 Myr.
This paper develops a refined theoretical and statistical framework to test screened modified gravity theories using strongly lensed gravitational waves, demonstrating that future next-generation detectors can provide stringent constraints on the post-Newtonian parameter and detect deviations from General Relativity on kpc-Mpc scales by leveraging precise time delay measurements to resolve mass-sheet degeneracy.
By combining a hybrid reconstruction of 65,518 galaxy peculiar velocities with 8,283 new redshifts—including 2,176 high-sensitivity HI measurements from the SARAO MeerKAT telescope to penetrate the southern Zone of Avoidance—this study reveals the Vela Supercluster as a dominant mass concentration rivaling the Shapley Concentration, thereby providing the most complete and dynamically consistent picture of the southern extragalactic sky to date.
This study uses 3D simulations of rotating hydrodynamic convection to demonstrate that thermal Rossby waves drive outward radial angular momentum transport at rapid rotation rates, revealing a significant discrepancy between these findings and the assumptions underlying current mean-field theories of solar differential rotation.
This paper proposes a UK-led near-infrared Integral Field Spectrograph to complement the US-led optical arm of the Habitable Worlds Observatory, enabling the comprehensive spectral analysis required to detect unambiguous biosignatures on habitable exoplanets.
This thesis utilizes strong gravitational lensing in the MACS J0416 field, combined with deep HST/JWST observations and machine learning to mitigate low-redshift interlopers, to test ultralight boson dark matter models and find no evidence for a faint-end turnover, thereby constraining the particle mass to be greater than $2.97\times10^{-22}$eV at 95% confidence.
This study analyzes the Indus stellar stream using Gaia data and N-body simulations to demonstrate that its observed longitudinal density fluctuations are primarily caused by natural epicyclic motions from tidal disruption rather than dark matter subhalo interactions, with the moderate sharpness of these peaks suggesting the progenitor dwarf galaxy originally possessed a cuspy dark matter halo.
This paper presents the Gravitational Waves-Lensing Mock Catalog (GW-LMC), a comprehensive suite of simulated strongly lensed gravitational wave events derived from a composite halo model, which forecasts hundreds of annual detections (including doublets, quadruplets, subhalo-lensed systems, and central images) for future third-generation ground-based detector networks and provides essential statistical priors for their identification.
This study demonstrates that void weak lensing, derived from the cross-correlation of cosmic voids and galaxy shear, provides a promising and independent constraint on the total neutrino mass with a linear signal-mass relationship, achieving a precision of eV in ideal conditions and $0.340$ eV under Stage-III-like noise levels.
This study reveals that optical quasi-periodic oscillations (QPOs) in the quasar 4C 50.43 exhibit distinct periodicities of 1124 and 513 days in different survey light curves, a discrepancy attributed to red noise and observational factors that cautions against the uncritical interpretation of optical QPOs as definitive indicators of binary black holes in active galactic nuclei.
This study utilizes multi-wavelength SDO observations to track the six-month decay of solar active region NOAA AR 12738, revealing that a peripheral dimming region's continuous areal decrease is driven by a distinct thermal deficit in the 10–10 K range rather than merely a lack of plasma, thereby offering new insights into active region thermal evolution and magnetic restructuring.