186 citations · 517 across the 17 of their papers we have counts for
8 papers · 1 filter
Unification of 3CR Radio Galaxies and Quasars
Bernhard Schulz, Ralf Siebenmorgen, Martin Haas +2
We have observed seven powerful FR2 radiogalaxies and seven quasars with the Spitzer IRS. Both samples are comparable in both, redshift range and isotropic 178 Hz luminosity. Both…
Dust Emission by AGN and Starbursts
Ralf Siebenmorgen
Present AGN and starburst models aiming to account for the observed infrared SEDs consider a physical description of the dust and a solution of the radiative transfer problem. MIR…
Discovery of 10 micron silicate emission in quasars. Evidence of the AGN unification scheme
R. Siebenmorgen, M. Haas, E. Kr"ugel +1
According to the unified scheme, AGN are surrounded by a dust-torus, and the observed diversity of AGN properties results from the different orientations relative to our line of si…
The protostellar system HH108MMS
R. Siebenmorgen, E. Kruegel
We probe the region around the protostar HH108MMS by deep mid infrared photometric and polarimetric imaging. The protostar is detected at 14mu in absorption against the diffuse bac…
Galaxies in the infrared
Ralf Siebenmorgen
The mid infrared spectra of the starbursts show the 9.7 silicate absorption feature and strong mid infrared emission bands centered at 6.2, 7.7, and 11.3 m. Illustrative mod…
Mid infrared emission of nearby Herbig Ae/Be stars
R. Siebenmorgen, T. Prusti, A. Natta +1
We present mid IR spectro-photometric imaging of a sample of eight nearby (pc) Herbig Ae/Be stars. The spectra are dominated by photospheric emission (HR6000), featurel…