316 papers
This paper presents an end-to-end deep learning pipeline that extends the AutoSourceID method to Cherenkov Telescope Array Observatory (CTAO) simulated data, offering a versatile framework for the detection, localization, and characterization of gamma-ray sources as a step toward a foundational model for astrophysical source detection.
Using a sample of 29 high-time-resolution FRBs from the CRAFT survey, this study models the de-biased intrinsic width and scattering distributions in the host rest-frame, finding that log-uniform distributions better describe the data than previous lognormal assumptions and revealing significant detection biases that impact population and cosmological studies.
Using non-LTE radiative transfer simulations, this study demonstrates that lanthanides significantly influence the infrared spectra of nebular phase kilonovae below 4 μm through dominant line opacity from species like Ce III and Nd II, yet their contribution remains insufficient to explain the smooth blackbody-like continua observed in events such as AT2023vfi, suggesting that near-infrared observations are optimal for probing lanthanides while mid-infrared spectroscopy can effectively isolate non-lanthanide emission.
Chandra and Hubble observations reveal that the short GRB 230906A originated from a compact binary merger within a peculiar, faint galaxy located in the tidal tail of a merging galaxy group at , suggesting the progenitor formed from a merger-induced starburst approximately 700 million years prior.
This paper demonstrates how large language models can automate the analysis of NASA's General Coordinates Network (GCN) Circulars by employing neural topic modeling for clustering, contrastive fine-tuning for classification, and retrieval-augmented generation to achieve high-accuracy extraction of gamma-ray burst redshifts, thereby significantly enhancing astronomical text mining capabilities.
This paper presents a 16-year multi-wavelength study of the TeV blazar TXS 0518+211, revealing complex jet emission properties characterized by high X-ray variability, weak inter-band correlations, and specific orphan flare events, which are best explained by a two-zone leptonic emission model.
Despite a technical malfunction limiting initial observations, analysis of Fermi LAT data and associated solar phenomena indicates that Solar Cycle 25 is stronger than Solar Cycle 24, with an estimated total of approximately 43 to 50 sustained gamma-ray emission events.
This paper demonstrates that shock-induced density and temperature perturbations in core-collapse supernovae and neutron star mergers can overcome electron mass damping to sustain the chiral plasma instability and generate substantial ohmic heating via the chiral magnetic effect.
By analyzing 17 years of Fermi-LAT data for the blazar PG 1553+113, this study reveals that while the source exhibits chromatic flares, its 2.2-year gamma-ray quasi-periodic oscillation is achromatic, thereby supporting a geometric origin like jet precession over intrinsic plasma-driven mechanisms.
By analyzing 18 years of Fermi-LAT data, this study links a 1.7-year gamma-ray quasi-periodic oscillation in PKS 2155-304 to a spectral hardening event occurring at flux minima, proposing a geometric masking scenario where jet structure regulates the visibility of acceleration processes otherwise obscured by relativistic boosting.
This paper proposes that geometric masking, where Doppler boosting preferentially amplifies a soft jet component in aligned AGN, explains extreme spectral hardening events and TeV detections in low-flux states, thereby refining the AGN unification scheme and suggesting that high-energy particle acceleration occurs more frequently than flux-selected observations imply.
This paper utilizes hydrodynamical simulations and analytical models to demonstrate that high-mass, centrally concentrated stars can survive numerous partial tidal disruption events by supermassive black holes, thereby explaining the repeating nuclear transients observed in sources like ASASSN-14ko and AT2020vdq, while low-mass stars are predicted to be destroyed after only a few encounters.
Using XRISM observations of 4U 1822-371, this study presents the first X-ray Doppler tomography of the Fe K line, revealing a compact reflector at the accretion stream-disk overflow that aligns with optical O VI emission and establishes a new method for mapping accreting systems.
This paper investigates the interaction between relativistic jets and supernova ejecta as the origin of X-ray knots in radio galaxies, using M 87's knot A to demonstrate that while the ejecta shock fails to match observed spatial scales, the jet shock successfully reproduces the morphology and spectral energy distribution, suggesting a mechanism for accelerating particles to ultra-high energies.
This paper reports the results of a directed search for continuous gravitational waves from unknown neutron stars in five Milky Way globular clusters using LIGO-Virgo-KAGRA data from the first eight months of the fourth observing run, finding no detections but setting the most sensitive upper limits to date across most of the explored parameter space.
This study demonstrates that future -ray observations from LHAASO-KM2A and the Cherenkov Telescope Array will significantly enhance the ability to identify distant pulsar halos by distinguishing their diffusion-based morphologies from alternative models through improved photon statistics and angular resolution.
This paper demonstrates that stochastic particle acceleration driven by pressure-anisotropy-induced magnetogenesis in the pre-structure Universe is inefficient for generating a significant cosmic ray population, as adiabatic cooling dominates until the onset of structure formation, limiting proton energies to at most .
This paper reports that one year after launch, the SVOM satellite's on-board Microchannel X-ray Telescope has successfully demonstrated its ability to localize gamma-ray burst afterglows within the required 2 arcminute uncertainty with an average positional accuracy of 40 arcseconds, enabling rapid ground dissemination for multi-wavelength follow-up observations.
This paper reviews the current status of nuclear physics in X-ray bursts by integrating new experimental and theoretical reaction rates to update the JINA REACLIB database and refine models of burst light curves and nuclear ash composition.
By analyzing radio observations of 11 tidal disruption event hosts, this study introduces a new methodology that reveals quiescent galaxies possess sub-parsec circumnuclear density profiles consistent with simple Bondi accretion flows, thereby enabling the first direct constraints on gas distributions and accretion rates within the Bondi spheres of previously quiescent supermassive black holes.