Marco Spaans

TL;DR: In this paper, a Monte Carlo method is used to solve the radiative transport in circumstellar OH masers, and the observed double-peaked 1612-MHz maser emission from expanding molecular shells around highly evolved stars.

TL;DR: In this paper, the authors explore the amplification of magnetic seed fields during the formation of the first stars and galaxies, and find that the magnetic field may be substantially amplified before the creation of a disk.

TL;DR: In this paper, an extension of the code ProDiMo that allows for a modeling of processes pertinent to active galactic nuclei and to an ambient chemistry that is time dependent is presented.

TL;DR: In this paper, the authors investigated the effect of the physical environment on water and ammonia abundances across the S140 photodissociation region (PDR) with an embedded outflow.

TL;DR: In this paper, the authors examined ways in which the abundance of these same elements, if present before the epoch of Population III formation, might be observedally established or ruled out, and showed that the most redshifted quasars, galaxies, and Lyα absorbers exhibit at least some admixture of heavier elements, as do the most ancient stars in the Galaxy.