Discovery of 14 solitary dwarf galaxy groups with dynamical masses around 10^12 solar masses, interpreted as tracers of primordial dark matter halos.
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Multi-epoch spectroscopy of 33 ECLEs shows coronal lines emitted at intermediate radii with log(distance)-log(black hole mass) slopes of 0.63 and 0.69 for [O III] and [Fe VII], consistent with photoionization setting the radii.
A new sample of 157 mid-IR dual AGN candidates in mergers yields 13 confirmed cases and 63 strong candidates at separations 14.5-129 kpc, over half beyond 50 kpc, with diverse BPT classes and 31% in multi-mergers.
No kilonova detected from sub-solar GW candidate S251112cm, but coincident IIb supernova SN 2025adtq yields suggestive evidence for the superkilonova channel, though inconclusive after accounting for chance coincidence.
Local compact AGN-hosting dwarf galaxies with V-shaped SEDs are more evolved than high-redshift Little Red Dots, indicating distinct formation pathways.
The paper reports the design, commissioning on two runs, and measured performance of proto-Lightspeed, a seeing-limited high-speed imager delivering sub-electron read noise on the Magellan Clay Telescope.
Weak-lensing analysis of Abell 85 resolves three substructures and finds a ~2:1 mass ratio between the main cluster and southern subcluster, indicating a major ongoing merger.
Optical imaging and BAGPIPES SED fitting of eight FXTs yields candidate hosts consistent with WD-IMBH TDEs or BNS mergers for most events, with one reclassified as a Galactic flare and evidence for diverse origins.
Ages inferred for red giant stars via machine learning are generally insensitive to hyperparameters and architecture but somewhat sensitive to training set choice, especially for the oldest, coolest, and lowest-metallicity stars.
Multiwavelength study of 621 winged radio galaxies shows XRGs are radio-luminous with frequent backflow signatures while ZRGs link to lower jet power and environmental perturbations.
PISP projects high-dimensional spectra into optimized subspaces using PCA or active subspaces plus L1 selection to raise accuracy and speed of stellar parameter inference over standard methods.
Hα luminosity functions at z~1.3 and z~2.0 yield faint-end slopes of -1.50 and -1.60, with integrated SFR densities of 0.097 and 0.129 M⊙ yr⁻¹ Mpc⁻³ from a sample of 99 emitters.
A Random Forest classifier on Chandra, Gaia, and CatWISE data identifies 1060 new quasar candidates behind the Galactic plane, with two spectroscopically confirmed at z~1.1-1.3.
LAMOST DR10-12 adds 11,346 quasars (5,386 new) with ZTF-recalibrated spectra and derived emission-line and black-hole mass properties to support variability and rare-object studies.
SSL model detects galaxy interaction signatures with recall 0.86 and low contamination while CAS at A>0.35 has recall 0.20 but higher precision, benchmarked on visual classification of 25.1% disturbed fraction.
Pilot FAST HD² survey reports 339 new HI detections in 10 deg² with 0.45 mJy rms, high DESI optical matching rates, and gas fraction relations consistent with ALFALFA, DINGO, and xGASS.
The thesis assesses the reliability of stellar population synthesis modeling for galaxy physical properties using limited multi-band photometry rather than full spectra.
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proto-Lightspeed: a high-speed, ultra-low read noise imager on the Magellan Clay Telescope
The paper reports the design, commissioning on two runs, and measured performance of proto-Lightspeed, a seeing-limited high-speed imager delivering sub-electron read noise on the Magellan Clay Telescope.