X-ray reverberation lags are used to measure the mass of the stellar-mass black hole Cygnus X-1 for the first time.
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3D simulations recover the critical obliquity for disc breaking predicted by semi-analytic models and reveal additional stabilization by spiral arms that can prevent breaking.
MESA grid models find HD 20794 is a 0.80 solar-mass star aged ~9 Gyr whose observed abundances match core-collapse supernova enrichment and are preserved over Gyr timescales.
New ALMA [C II] and FIR data on PSO J083+11 at z=6.34 reveal ordered rotation, typical star-forming ratios, and no outflow signatures in either galaxy, interpreted as a pre-AGN-feedback accretion phase.
Supernova remnants destroy interstellar dust less efficiently per event in dense high-star-formation regions than in the Milky Way's diffuse medium, with destruction maximized when thermal sputtering time matches the remnant age and scaling linearly with metallicity.
Galaxies in the Shapley Supercluster core have depleted HI gas fractions and longer depletion timescales than field galaxies, consistent with starvation-driven quenching.
A robust statistical test for galaxy catalog magnitude completeness improves H0 constraints by 1.3-8.6% in GWTC-1 analyses but shows no benefit for GWTC-3 due to limited K-band coverage in GLADE+.
Identifies eight Fermi-GBM sGRBs similar to 170817A via hardness-ratio K-means clustering and estimates ~5 GW+sGRB events by end of O4.
42 supernova remnants confirmed in NGC3344 via [S II]/Hα selection, Sabbadin plots, BPT diagrams and shock models from SITELLE data.
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A Theoretical Study of the Structure and Elemental Abundances of HD 20794
MESA grid models find HD 20794 is a 0.80 solar-mass star aged ~9 Gyr whose observed abundances match core-collapse supernova enrichment and are preserved over Gyr timescales.