Publications (9)
Luminosity distance and extinction by submicrometer-sized grains
Ralf Siebenmorgen, Frank Heymann, Rolf Chini
The distance to the stars is a fundamental parameter, which is determined via two primary methods - parallax and luminosity. While the parallax is a direct trigonometric method, th…
Self-consistent 2-phase AGN torus models: SED library for observers
Ralf Siebenmorgen, Frank Heymann, Andreas Efstathiou
We assume that dust near active galactic nuclei (AGN) is distributed in a torus-like geometry, which may be described by a clumpy medium or a homogeneous disk or as a combination o…
Shadows, gaps, and ring-like structures in protoplanetary disks
Ralf Siebenmorgen, Frank Heymann
We study the structure of passively heated disks around T Tauri and Herbig Ae stars, and present a vectorized Monte Carlo dust radiative transfer model of protoplanetary disks. The…
PAH in three dimensional Monte Carlo radiativtive transfer
Ralf Siebenmorgen, Frank Heymann, Endrik Krügel
We present a Monte Carlo (MC) radiative transfer code for complex three dimensional dust distributions and include transiently heated PAH. The correctness of the code is confirmed…
PAHs in protoplanetary disks: emission and X-ray destruction
Ralf Siebenmorgen, Frank Heymann
We study the PAH emission from protoplanetary disks. First, we discuss the dependence of the PAH band ratios on the hardness of the absorbed photons and the temperature of the star…
The processing of radiation by dust in galaxies
Ralf Siebenmorgen, Frank Heymann
Optical/UV photons and even harder radiation components in galaxies are absorbed and scattered by dust and re-emitted at infrared wavelengths. For a better understanding of the obs…