476 citations · 10.1k across the 164 of their papers we have counts for
9 papers · 2 filters
The prospects of finding the first quasars in the universe
Dominik R. G. Schleicher, Marco Spaans, Ralf S. Klessen
We study the prospects of finding the first quasars in the universe with ALMA and JWST. For this purpose, we derive a model for the high-redshift black hole population based on obs…
High-resolution HNC 3-2 SMA observations of Arp220
S. Aalto, D. Wilner, M. Spaans +4
We present high resolution (0."4) observations of HNC J=3-2 with the SubMillimeter Array (SMA). We find luminous HNC 3-2 line emission in the western part of Arp220, centered on th…
Rotational Line Emission from Water in Protoplanetary Disks
R. Meijerink, D. R. Poelman, M. Spaans +2
Circumstellar disks provide the material reservoir for the growth of young stars and for planet formation. We combine a high-level radiative transfer program with a thermal-chemica…
Mechanical feedback in the molecular ISM of luminous IR galaxies
A. F. Loenen, M. Spaans, W. A. Baan +1
Aims: Molecular emission lines originating in the nuclei of luminous infra-red galaxies are used to determine the physical properties of the nuclear ISM in these systems. Methods:…
Spitzer's mid-infrared view on an outer Galaxy Infrared Dark Cloud candidate toward NGC 7538
W. F. Frieswijk, M. Spaans, R. F. Shipman +3
Infrared Dark Clouds (IRDCs) represent the earliest observed stages of clustered star formation, characterized by large column densities of cold and dense molecular material observ…
Interstellar Chemistry: Radiation, Dust and Metals
M. Spaans
An overview is given of the chemical processes that occur in primordial systems under the influence of radiation, metal abundances and dust surface reactions. It is found that radi…
The Molecular Hydrogen Explorer H2EX
F. Boulanger, J. P. Maillard, P. Appleton +12
The Molecular Hydrogen Explorer, H2EX, was proposed in response to the ESA 2015 - 2025 Cosmic Vision Call as a medium class space mission with NASA and CSA participations. The miss…
Monte Carlo simulation of particle interactions at high dynamic range: Advancing beyond the Googol
C. W. Ormel, M. Spaans
We present a method which extends Monte Carlo studies to situations that require a large dynamic range in particle number. The underlying idea is that, in order to calculate the co…
On the Detection of High Redshift Black Holes with ALMA through CO and H2 Emission
M. Spaans, R Meijerink
Many present-day galaxies are known to harbor supermassive, >10^6 Mo, black holes. These central black holes must have grown through accretion from less massive seeds in the early…