In the gravitational lens SDSS J1004+4112, a background quasar is lensed by a galaxy cluster, hence the light from the quasar images travels mainly through the intracluster medium. Observations in the continuum emission and the broad line region detected variability due to microlensing in the multiple images of the quasar. In this work, we use the

Context. Cas OB5 is an OB association located at a distance of 2.5–3 kpc that intercepts the Perseus spiral arm. It carries a moderate amount of reddening (A V ~ 2–3 mag) and contains several well-known open clusters within its boundaries, such as King 12, NGC 7788, and NGC 7790. The availability of modern clustering algorithms, together with Gaia

Context. Metal-poor stars play a crucial role in understanding the nature and evolution of the first stellar generation in the Galaxy. Previously, asteroseismic characterisation of red-giant stars has relied on constraints from the global asteroseismic parameters and not the full spectrum of individual oscillation modes. Using the latter, we

We present the first measurement of cosmic-ray fluxes of Li 6 and Li 7 isotopes in the rigidity range from 1.9 to 25 GV. The measurements are based on 9.7 × 10 5 Li 6 and 1.04 × 10 6 Li 7 nuclei collected by the Alpha Magnetic Spectrometer on the International Space Station from May 2011 to October 2023. We observe that over the entire rigidity

Galaxy clusters, the largest gravitationally-bound structures in the Universe, primarily consist of dark matter, offering a unique opportunity for investigating its distribution and behavior. Our study involves an examination of the stellar-to-smooth dark matter mass fraction in the galaxy cluster lensing the quasar SDSS J1326+4806, while