Origin of E+A galaxies - I. Physical properties of E+A galaxies formed from galaxy merging and interaction
We investigate the structural, kinematical and spectrophotometric properties of `E+A' galaxies - those with strong Balmer absorption lines but no significant...
Origin of stellar prolate rotation in a cosmologically simulated faint dwarf galaxy
Stellar prolate rotation in dwarf galaxies is rather uncommon, with only two known galaxies in the Local Group showing such feature (Phoenix and And II)...
Origin of the chromospheric three-minute oscillations in sunspot umbrae
Context. Sunspot umbrae show a change in the dominant period of their oscillations from five minutes (3.3 mHz) in the photosphere to three minutes (5.5 mHz) in...
Origin of the near-Earth asteroid Phaethon and the Geminids meteor shower
Aims: In this paper we establish a compositional and dynamical connection between two B-type objects: main belt asteroid (2) Pallas and near-Earth asteroid...
Origin of the X-ray background and AGN unification: new perspectives
We critically review the basic assumptions of the standard model for the synthesis of the X-ray background (XRB) in the light of new data from ultradeep surveys...
Orphan optical flare as SOSS emission afterglow, localization in time
We report on MASTER optical observations of an afterglow-like optical and X-ray transient AT2021lfa/ZTF21aayokph. We detected the initial steady brightening of...
Oscillating red giants in eclipsing binary systems: empirical reference value for asteroseismic scaling relation
The internal structures and properties of oscillating red-giant stars can be accurately inferred through their global oscillation modes (asteroseismology)...