The linearly polarized solar limb spectrum that is produced by scattering processes contains a wealth of information on the physical conditions and magnetic fields of the solar outer atmosphere, but the modeling of many of its strongest spectral lines requires solving an involved non-local thermodynamic equilibrium radiative transfer problem

We perform a sample of N-body simulations of a minor merger between a Milky Way type galaxy and a satellite, which is density scaled version of the primary galaxy. In this suite of collisionless runs we change the value of some critical parameters like the luminous mass ratio between the two galaxies (1 : 6, 1 : 9), the type of orbit (direct or

Mircea Eliade (1992) argued that a single view of the starry celestial vault would be sufficient to awake a religious experience. This idea is as true today as in the remote past. Hence, the starry sky has often served as a source of inspiration not just for science, but metaphysics, art, and the creation of symbols of power and identity. Ancient

We present here a new theoretical model designed to explain the interstellar dust grain size distribution function (IDGSDF), and compare its results with previous observationally derived distributions and with previous theoretical models. The range of grain sizes produced in the late stages of stars with different masses is considered, and folded

Several authors have studied the dependence of galaxy properties on environment in order to understand which mechanisms operate in the galaxy evolution. Recently, some of them have proposed that intermediate densities could be sites where local environment influences the transition of galaxies onto the red-sequence, as opposed to mechanisms that

Active Galactic Nuclei (AGN) play an important role in many aspects of modern cosmology. One of the fundamental goals in cosmology is to determine the fraction of galaxies having AGN as a function of its morphology, environment, redshift, etc., and conversely, to determine how an AGN affects other galaxy properties, and which is the mechanism of