Stellar streams produced from dwarf galaxies provide direct evidence of the hierarchical formation Milky Way. Here, we present first comprehensive study LMS-1 stellar stream, that detect by searching for wide in Gaia EDR3 data set using STREAMFINDER algorithm. This stream was recently discovered Yuan et al. We as a 60° long to north galactic bulge, at distance ∼20 kpc Sun, together with additio...

Using recent observational data, we construct a set of multi-component equilibrium models the disk Milky Way-like galaxy. The dynamics are studied using collisionless-gaseous numerical simulations, based on joined integration equations motion for collision-less particles direct gravitational interaction and gaseous SPH-particles. We find that after approximately one Gyr, prominent central bar i...

We compare the observed radial velocity of different arm tracers, taken near tangent to a spiral arm. A slight difference is predicted by density wave theory, given shock at entrance inner In many these arms, offset confirms prediction theory (with separation between maser and CO gas peak velocity, about 20 km/s) - when bigger than error estimates. The time reach next given.