476 citations · 10.1k across the 164 of their papers we have counts for
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Lyman Alpha Radiation From Collapsing Protogalaxies II: Observational Evidence for Gas Infall
Mark Dijkstra, Zoltan Haiman, Marco Spaans
We model the spectra and surface brightness distributions for the Lyman alpha (Lya) radiation expected from protogalaxies that are caught in the early stages of their assembly. We…
Lyman Alpha Radiation From Collapsing Protogalaxies I: Characteristics of the Emergent Spectrum
Mark Dijkstra, Zoltan Haiman, Marco Spaans
We present Monte Carlo calculations of Lyman alpha (Lya) radiative transfer through collapsing gas clouds, representing proto-galaxies that are caught in the process of their assem…
Gravoturbulent Star Formation: Effects of the Equation of State on Stellar Masses
R. S. Klessen, M. Spaans, A. -K. Jappsen
Stars form by gravoturbulent fragmentation of interstellar gas clouds. The supersonic turbulence ubiquitously observed in Galactic molecular gas generates strong density fluctuatio…
The excitation of water in the S140 photon dominated region
D. R. Poelman, M. Spaans
We consider the excitation of water in the Photon Dominated Region (PDR). With the use of a three-dimensional escape probability method we compute the level populations of ortho- a…
Diagnostics of irradiated gas in galaxy nuclei. I: A Far-ultraviolet and X-ray dominated region code
Rowin Meijerink, Marco Spaans
We present a far-ultraviolet (PDR) and an X-ray dominated region (XDR) code. We include and discuss thermal and chemical processes that pertain to irradiated gas. An elaborate chem…
A Background Independent Description of Physical Processes
M. Spaans
A mathematical structure is presented that allows one to define a physical process independent of any background. That is, it is possible, for a set of objects, to choose an object…