321 papers
This paper reports the first isotopic ratio measurements for an interstellar comet, 3I/ATLAS, revealing elevated nitrogen and carbon ratios that suggest the object originated in the outer disc of an older, low-metallicity star.
By modeling eight Milky Way dwarf spheroidal galaxies with solitonic cores and NFW envelopes while accounting for core-halo diversity, this study identifies two distinct fuzzy dark matter particle mass ranges consistent with observed kinematics, though the resulting constraints challenge the theory by conflicting with satellite abundance counts and Lyman- forest limits.
This paper presents multi-epoch VLBI and spectral monitoring of the supermassive black hole binary candidate SDSS J143016.05+230344.4, revealing a delayed radio flare that traces kinetic energy injection from a compact synchrotron component interacting with a structured circumnuclear medium.
This paper presents a new three-parameter calibration of the broad-line region size-luminosity-velocity relation that incorporates the Eddington ratio to correct systematic biases in high-Eddington AGNs, leading to revised single-epoch black hole mass estimators that significantly alter previous cosmic mass density and early-universe seed growth calculations.
The paper reports that comet 3I/ATLAS, originating from another planetary system, exhibits a deuterium-to-hydrogen ratio in its water exceeding Earth's ocean values by over 40 times and typical Solar System cometary values by over 30 times, indicating its water formed under significantly colder and less irradiated conditions than those found in our own solar system.
This study utilizes SPH simulations to demonstrate that while no initial alignment exists between sink angular momentum and host filaments, gravity-driven longitudinal flows eventually develop to reorient angular momentum vectors into a predominantly perpendicular configuration, potentially explaining observed outflow-filament alignments within typical outflow lifetimes.
Using new IRAM 30m CO(2-1) observations, this study reveals that the nearby edge-on spiral galaxy NGC 891 hosts a significant extraplanar molecular gas component extending up to 1.4 kpc above the disk midplane, which accounts for up to 27% of the galaxy's total molecular mass and is likely driven by star formation feedback within a galactic fountain scenario.
This paper presents isotopic measurements of the interstellar object 3I/ATLAS, revealing extreme deuterium and carbon ratios that indicate it formed over 10 billion years ago in a cold, metal-poor environment within the early Milky Way, making it a unique preserved fragment of an ancient planetary system unlike any known Solar System body.
This study presents the results of a three-year IUE monitoring campaign of the Seyfert 1 galaxy ESO 141-G55, revealing significant UV continuum and line variability with measured time lags for Si IV, C IV, and He II that suggest an outer accretion disc as the origin of these emission lines.
By extending a hierarchical Bayesian framework to incorporate pulsar observations and explicitly modeling density uncertainties, this study refines the two-part power-law relationship between magnetic field strength and gas density in the interstellar medium, confirming a non-zero exponent for diffuse gas and providing precise constraints on the transition density and field strength parameters.
Using deep-learning analysis of 43,922 galaxies from the 4MOST CHANCES survey, this study reveals that galaxy mergers are significantly more likely to occur near cosmic web filaments than in other regions, suggesting that these filaments facilitate pre-processing interactions that transform galaxies before they enter cluster cores.
This paper introduces a differentiable and optimizable 3D geometrical model that successfully reproduces observed molecular spectral cubes of the prestellar core L1544, revealing that an asymmetric density and velocity structure is required to explain the velocity differences between p-NH2D and N2D+.
This study utilizes direct N-body simulations to demonstrate that the binary population within low-mass globular cluster streams is dynamically shaped by initial cluster density and massive star fractions, resulting in the disruption of wide binaries and the central concentration of close binaries, which collectively add a small but measurable velocity dispersion to the streams.
This paper proposes a novel H and HD formation pathway driven by Jahn-Teller dynamical coupling in H that bypasses standard CMB-suppressed intermediates, potentially explaining the unexpectedly early and abundant formation of luminous galaxies and supermassive black holes observed by the James Webb Space Telescope.
Using the TripleSpec spectrograph at Palomar Observatory, researchers conducted a dedicated search for the predicted 1.05 m aromatic infrared band in absorption toward the highly-extinguished star BD+40 4223 but found no evidence for the feature, establishing a strict upper limit that challenges existing models of polycyclic aromatic hydrocarbon properties and charge distribution.
This paper introduces a multi-modal deep learning framework utilizing Vision Transformers and cross-attention mechanisms to accurately infer protostellar mass, inclination, and position angle from CO observations, effectively overcoming projection biases and demonstrating superior robustness compared to traditional convolutional networks.
By coupling radiation-hydrodynamic simulations with radiative-transfer calculations for the type-1 Seyfert galaxy NGC 3783, this study demonstrates that the observed broad Br line profile arises from intrinsic emission by a rotating thin disk that is significantly broadened and smoothed by electron scattering in a surrounding diffuse ionized haze.
This paper proposes that the unexpectedly high-redshift sources detected by JWST, which may be contaminants or candidates at , could instead be hyper-energetic pair-instability supernovae from the first metal-free stars, a scenario supported by cosmological simulations showing a non-negligible chance of such detections that would provide direct evidence of the epoch of first star formation.
This paper presents an updated multiwavelength version of the G4Jy catalogue with 127 new host-galaxy identifications and enhanced redshift data, while introducing a novel radio-power–size–spectral-curvature analysis that reveals distinct populations of remnant, young, and restarted radio galaxies alongside new insights into their host-galaxy properties and infrared colors.
This paper introduces a novel statistical method using astrometric asymmetries in lensed arcs to constrain the dark matter subhalo mass fraction in galaxy clusters, demonstrating its reliability through simulations and preliminary applications to JWST observations of MACSJ0416 and AS1063 that yield results consistent with Cold Dark Matter predictions.