363 papers
Using N-body simulations based on Gaia DR3 data, this study reveals that binary disruption in young open clusters occurs in two distinct stages driven by initial density and binary parameters, ultimately shaping the differing binary fractions and orbital characteristics of stars that remain bound versus those that escape into the field population.
By reconstructing age-metallicity relations and analyzing multiple stellar population properties across 69 Galactic globular clusters, this study reveals that while progenitor chemical evolution histories vary significantly, the amplitude of helium enrichment is universally regulated by cluster mass rather than environmental origin, with the exception of the Sequoia family which exhibits a distinct first-population fraction.
This paper investigates the limits of semi-analytic baryon correction models by systematically replacing dark matter halo regions with hydrodynamical counterparts, revealing that while massive halos drive most baryonic suppression in power spectra, different weak lensing statistics exhibit distinct sensitivities to mass and radius that expose specific calibration failures in current models.
This study analyzes archival X-ray data from NGC4051 and NGC4395 to demonstrate that while the bending frequency of their power spectral density remains energy-independent, the high-frequency slope flattens and the amplitude decreases as photon energy increases, providing critical constraints for models of AGN X-ray variability.
This study analyzes multi-wavelength data of the nearby luminous infrared galaxy IRAS 04296+2923 to reveal that it forms a gravitationally bound, rotating pair with a close companion within a small galaxy group, suggesting its intense starburst activity is driven by internal processes like bar-induced gas inflow rather than an advanced merger.
This study presents the first sub-parsec scale VLBI analysis of the FRII radio galaxy 3C 452, revealing a symmetric, parabolically expanding twin-jet system with low Doppler factors indicative of a large viewing angle and demonstrating that narrow-line high-excitation radio galaxies achieve jet collimation at significantly smaller scales than their broad-line counterparts.
Using APOGEE DR17 and BAWLAS data, this study identifies six distinct stellar populations within the Milky Way's bulge-bar and reveals that while low-eccentricity and high-eccentricity groups exhibit varying metallicity gradients, the high-[Mg/Fe] bar population displays a uniquely steep positive chemical gradient likely driven by age variations along the peanut structure, a finding consistent with N-body simulations and observations of high-redshift galaxies.
Using XMM-Newton and Chandra data, this study identifies a merger shock in the Norma galaxy cluster that significantly enhances ram pressure stripping and alters the morphology of embedded galaxies, including creating a bright X-ray tail and transforming a radio jet into a vortex ring structure.
This study uses -body simulations to demonstrate that while massive and compact classical bulges significantly delay bar formation and alter initial pattern speeds, their influence diminishes during the secular growth stage where the disk component primarily dictates the evolution of bar pattern speed and strength.
This paper presents high-resolution AstroSat-UVIT observations of the projected galaxy pair PGC 56121 and PGC 56125 in Hickson Compact Group 77, revealing new star-forming regions, a candidate tidal dwarf galaxy, and evidence that the system comprises a small group of interacting galaxies through multi-wavelength analysis of their physical properties.
Using JWST observations and PCA tomography, this study provides the first direct kinematic evidence that dusty outflows in local Seyfert galaxies contain neutral, large Polycyclic Aromatic Hydrocarbons (PAHs) with velocities matching high-ionization lines, distinct from the smaller PAHs found in star-forming regions.
This paper analyzes the scaling relations between gas mass and young stellar object counts within the Orion A Giant Molecular Cloud using dendrograms and Herschel data, confirming a linear - relation across multiple scales while highlighting discrepancies in the - relation that suggest limitations in using the free-fall timescale to define star-forming efficiency.
This paper presents and evaluates an updated \synthpop Galactic model tuned for the Nancy Grace Roman Space Telescope's Galactic Bulge Time Domain Survey, demonstrating good agreement with observational data across most of the bulge while identifying specific inconsistencies near the Galactic plane that require further investigation.
By deploying the new Arkenstone galactic wind model in cosmological simulations, this study demonstrates that high specific energy winds with energy loadings inversely scaling to halo mass effectively regulate star formation by heating the circumgalactic medium and suppressing gas accretion, achieving observational consistency with significantly lower mass loadings and supernova energy requirements than previous ejective feedback models.
By analyzing 2693 rotation-curve measurements from 153 SPARC galaxies within a unified radial framework defined by baryonic acceleration, the study reveals a galaxy-independent dark-matter halo structure characterized by a universal density profile (), a linear mass growth with radius, and a constant rotation velocity beyond a specific scaled distance.
Using self-consistent GNC simulations over 12 Gyr, this study investigates the co-evolution of nuclear star clusters and massive black holes to characterize the rates, orbital properties, and mass growth contributions of extreme mass-ratio inspirals and tidal disruption events across diverse stellar populations.
This paper establishes that the Centaurus A and M83 galaxy pair is dynamically infalling toward each other with a total mass of approximately $6.36 \times 10^{12}\, M_\odot$, confirming their status as a compelling nearby analog to the Milky Way-Andromeda system in the Local Group.
This paper presents an unbiased method for mapping particles to distribution functions that unifies Boltzmann's and Gibbs' paradigms to derive the principle of maximum entropy, enabling a rigorous statistical mechanical treatment of self-gravitating systems through the decoupling of time and ensemble averages.
This study utilizes Gaia DR3 astrometry and APOGEE metallicities to construct a comprehensive membership catalog of the Sagittarius dwarf spheroidal galaxy core and Messier 54, revealing a precise 2% distance measurement that confirms their spatial co-location and provides evidence for an infall scenario.
This paper presents a unified framework for constraining extended dark matter compact objects (EDCOs) by modeling their gravitational wakes and gas heating effects as they traverse the interstellar medium, yielding new limits on their abundance in the Leo T dwarf galaxy for masses exceeding one solar mass.