We use numerical mass density profiles from the TNG50 simulation to study the impact of gravitational milli-lensing by dark matter subhaloes on the images of lensed quasars. Specifically, we study the formation of subimages and the probability of their detection. For high-concentration density profiles, the mass determines the amplitude of the

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

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

We present the preliminary results of the sustainability survey carried out by the ``SEA Cero CO 2'' working group among Spanish astronomers. The survey aimed at studying, within a limited scope, the carbon footprint of astronomical research carried out in Spain, as well as to collect the opinion of Spanish astronomers about possible ways to reduce