201 citations · 596 across the 29 of their papers we have counts for
4 papers · 2 filters
Galactic hydraulic drop?
Steen H. Hansen
Galaxies and galaxy clusters are observed to have a rather non-trivial radial behaviour. The observations show that the radial profiles change from one power-law profile near the c…
Extraction of cluster parameters from Sunyaev-Zeldovich effect observations with simulated annealing optimization
Steen H. Hansen
We present a user-friendly tool for the analysis of data from Sunyaev-Zeldovich effect observations. The tool is based on the stochastic method of simulated annealing, and allows t…
Constraining the helium abundance with CMB
Roberto Trotta, Steen H. Hansen
We consider for the first time the ability of present-day cosmic microwave background (CMB) anisotropies data to determine the primordial helium mass fraction, Y_p. We find that CM…
The origin of cores and density profiles of gaseous baryonic structures
Steen H. Hansen, Joachim Stadel
We study the origin of cores and density profiles of gaseous baryonic structures in cosmology. By treating the baryons as a viscous gas, we find that both spheres and disks are pos…