411 papers
Using ALMA observations of interstellar comet 3I/ATLAS, researchers detected distinct outgassing behaviors between methanol and hydrogen cyanide, revealing a remarkably high CHOH/HCN production rate ratio that ranks among the highest ever measured in comets and is surpassed only by the anomalous C/2016 R2.
This paper presents the first release of the Stellar Stream Legacy Survey (SSLS), which visually identifies accretion features around 730 nearby dwarf galaxies to establish a baseline frequency of 5.1% and highlight the observational challenges and theoretical needs in studying low-mass galaxy mergers.
By applying the black-hole-envelope model to reanalyze the spectral energy distributions of approximately 400 Little Red Dots, this study demonstrates that interpreting these sources as accreting black holes shrouded in dense gas, rather than dust-reddened AGNs, resolves their puzzling spectral features and reconciles their cosmological demographics with the established evolution of black holes at .
This study presents the first detection of complex organic molecules and deuterated species in a shock-impacted clump at the interface of supernova remnant W44 and a molecular cloud, revealing chemical properties consistent with early-stage low-mass star formation that may preserve a chemical budget ultimately incorporated into planetary systems.
Using MUSE integral field spectroscopy, this study analyzes the stellar population properties of ultra-diffuse and low-surface brightness galaxies in the Hydra I cluster, revealing distinct formation pathways where most galaxies align with a puffed-up dwarf scenario while metal-richer inner galaxies suggest significant environmental influence.
Using high-resolution JWST observations of the strongly lensed galaxy HCM 6A at , this study reveals that feedback-driven multiphase interstellar medium structures and dust-cleared central clumps in young star-forming regions enable efficient Lyman- escape despite moderate dust content during the epoch of reionization.
By comparing star-forming galaxies with and without high-frequency radio detections, this study reveals that compact, GHz-detected systems exhibit AGN-like kinematic and morphological properties, suggesting they may harbor hidden, restarted, or relic AGN activity rather than being powered solely by star formation.
This paper proposes that magnetic fields spreading diffusively from stellar and galactic dynamos into their turbulent, poorly conducting exteriors form confined magnetospheres with distinct decay properties and expansion dynamics that differ from standard potential or force-free models, thereby ruling out such fields as the source of intergalactic void magnetization.
By combining high-resolution LOFAR-VLBI, uGMRT, and VLA multi-frequency data, this study reveals the complex spectral, morphological, and polarized properties of filaments in the merging galaxy cluster Abell 2255, identifying steep-spectrum extensions up to 250 kpc and highlighting the Original TRG as the primary driver of these structures.
This study utilizes JWST and HST observations to reveal that a young, in-situ formed star cluster within a tidal bridge of an interacting galaxy pair at z=3 exhibits a high Lyman-continuum escape fraction of 57%, suggesting that such tidal features play a crucial role in facilitating ionizing radiation escape and shaping the diversity of Lyman-continuum emitters at Cosmic Noon.
By combining L-band spectra of 15 backlit young stellar objects in the Central Molecular Zone with multi-wavelength data, this study reveals an ensemble-averaged methanol ice abundance profile that is systematically lower than in the Galactic disk and increases from the inner to outer envelope regions, likely due to the sublimation of methanol ice caused by intense heating from massive protostars.
Using deep Arecibo and optical survey data, the study reveals that the Ultra Diffuse Galaxy VCC 1964 exhibits a significant 9 kpc offset between its gas and stellar components and a potential dark matter deficit, suggesting it is a field UDG undergoing its first ram-pressure stripping event as it enters a galaxy cluster.
The MUSE-ALMA Haloes survey significantly expands the sample of HI-selected galaxies at by doubling the number of CO detections, revealing a dual star formation efficiency where low-mass systems follow main-sequence relations while high-mass systems exhibit suppressed activity, thereby offering crucial insights into the baryon census and galaxy evolution at this redshift.
This study introduces a physically motivated mass-loss prescription for Eddington-limit induced ejections in 1D stellar evolution codes, demonstrating that incorporating this mechanism into single and binary models successfully reconciles theoretical predictions with observed massive star populations in the Magellanic Clouds, including their luminosity limits, evolutionary stages, and binary fractions.
Using a stacked sample of 3,496 galaxy clusters from ACT-DR4 and DR6 data, this study demonstrates that while four different pressure profile models (gNFW, -model, polytropic, and exponential) fit the observed Sunyaev-Zel'dovich signals equally well, residual trends and scatter prevent the assumption of a truly universal pressure profile, particularly for high-precision applications.
This study utilizes ALMA and HST observations to reveal that while unresolved beam-sized analyses of 27 local LIRGs suggest a dual star formation relation, resolving individual molecular gas clumps uncovers a single, universal trend where star formation efficiency increases and becomes self-gravity regulated as mergers progress from early to late stages.
Using high-resolution CO(2-1) observations from PHANGS-ALMA, this study characterizes the molecular gas content and star formation rates of 20 central rings in nearby galaxies, revealing that while their absolute properties vary with host galaxy characteristics, their relative contributions to global gas and star formation closely resemble those of the Milky Way's Central Molecular Zone, suggesting universal physical processes govern these structures.
Using high-resolution ESPRESSO spectroscopy, researchers detected the highest-redshift H2 absorption to date at z=4.24, revealing the existence of widespread, tiny cold overdensities in the neutral medium that are typically undetectable in standard surveys.
Using high-resolution XRISM/Resolve spectroscopy, this study reveals that while the hot X-ray gas in M87's AGN-associated arms shows limited dynamical impact, the cooler uplifted gas exhibits significant velocity gradients and dispersions, supporting the uplift scenario and suggesting that AGN-driven motions in the hot ICM are short-lived.
Using ALMA and VLT/MUSE observations, researchers characterize a massive, multi-phase outflow in the local merger IRAS20100-4156 driven by starburst activity that contains 40% of the system's molecular gas and shows no signs of deceleration over kiloparsec scales, suggesting ongoing acceleration mechanisms.