Context. Core extremely red quasars (core ERQ) have been proposed to represent an intermediate evolutionary phase in which a heavily obscured quasar blows out the circumnuclear interstellar medium with very energetic outflows before it becomes an optical quasar. Aims: We investigate whether the properties of core ERQ fit the AGN orientation-based

X-ray binaries are stellar systems composed of a neutron star or a black hole that accretes mass from a companion star. The transferred material carries angular momentum and an accretion disc is naturally formed around the compact object. There, the dissipative forces transform the potential energy of the gas into heat. In the process, the gas

X-ray binaries are stellar systems composed of a neutron star or a black hole that accretes mass from a companion star. The transferred material carries angular momentum and an accretion disc is naturally formed around the compact object. There, the dissipative forces transform the potential energy of the gas into heat. In the process, the gas

We report a planet in a binary that was discovered from the analysis of the microlensing event OGLE-2018-BLG-1700. We identify the triple nature of the lens from the fact that the anomaly pattern can be decomposed into two parts produced by two binary-lens events, in which one binary pair has a mass ratio of ∼0.01 between the lens components and

We present the analysis of the binary-lens microlensing event OGLE-2013-BLG-0911. The best-fit solutions indicate the binary mass ratio of q ≃ 0.03, which differs from that reported in Shvartzvald et al. The event suffers from the well-known close/wide degeneracy, resulting in two groups of solutions for the projected separation normalized by the

Context. The Milky Way nuclear star cluster (MWNSC) is a crucial laboratory for studying the galactic nuclei of other galaxies, but its properties have not been determined unambiguously until now. Aims: We aim to study the size and spatial structure of the MWNSC. Methods: This study uses data and methods that address potential shortcomings of