Using magnetohydrodynamic (MHD) adaptive mesh refinement simulations, we study the formation and early evolution of disk galaxies with a magnetized interstellar medium. For a 10 M⊙ halo with initial NFW dark matter and gas profiles, we impose a uniform 10 G magnetic field and follow its collapse, disk formation and evolution up to 1 Gyr. Comparing to a purely hydrodynamic simulation with the sa...

Magnetic pressure has long been known to dominate over gas pressure in atomic and molecular regions of the interstellar medium. Here I review several recent observational studies of the relationships between the H, H and H2 regions in M42 (the Orion complex) and M17. A simple picture results. When stars form they push back surrounding material, mainly through the outward momentum of starlight a...

Interstellar matter (ISM) sets the boundary conditions of the heliosphere and dominates the inter-planetary medium. The heliosphere configuration has varied over recent history, as the Sun emerged from the Local Bubble and entered a turbulent outflow of cloudlets originating from the Scorpius-Centaurus Association direction. Several indicators suggest that the local interstellar magnetic field ...

The polarisation properties of the intrinsically small (< 20 kpc) radio sources are briefly discussed. At centimetric and decimetric wavelengths, substantial polarised emission is often detected in quasars and, at a lower level, in radio sources identified with galaxies with projected linear sizes in excess of a few kpc. The projected linear size at which some polarised emission is detected dec...

The influence of exponential magnetic field decay on the spin evolution of isolated neutron stars is studied. ROSAT observations have revealed several X-ray sources which may be accreting old isolated neutron stars. Assuming that this interpretation is correct, the observations can be used to constrain parameters of the exponential field decay. We show that the range of minimum value of magneti...

A review of the neutrino conversion and oscillations among the two neutrino species (active and sterile) induced by strong twisting magnetic field is presented and implications to neutrinos in neutron star, supernova, the Sun and interstellar galactic media are discussed. The “cross-boundary effect” (CBE) (i.e., a possible conversion of one half of neutrinos of the bunch from active into steril...