O
Ortwin Gerhard
Researcher at Max Planck Society
Publications - 463
Citations - 29734
Ortwin Gerhard is an academic researcher from Max Planck Society. The author has contributed to research in topics: Galaxy & Bulge. The author has an hindex of 90, co-authored 450 publications receiving 27269 citations. Previous affiliations of Ortwin Gerhard include University of Basel & ASTRON.
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Large-scale Gas Dynamics in the Milky Way
TL;DR: In this paper, a gas flow model for the Milky way inside the solar circle is presented using a mass model derived from the COBE/DIRBE maps and clump giant star counts.
Journal ArticleDOI
Dark-Matter Content of Early-Type Galaxies with Planetary Nebulae
Nicola R. Napolitano,A. J. Romanowsky,Lodovico Coccato,Massimo Capaccioli,Nigel G. Douglas,E. Noordermeer,Michael R. Merrifield,Konrad Kuijken,Magda Arnaboldi,Ortwin Gerhard,Kenneth C. Freeman,F. De Lorenzi,Payel Das +12 more
TL;DR: In this article, the authors examined the dark matter properties of nearby early-type galaxies using planetary nebulae (PNe) as mass probes, and found a correlation between global dark-to-luminous mass virial ratio (f_DM=M_DM/M_star) and the galaxy luminosity and mass.
The flattening of dark matter halo of Centaurus A galaxy (NGC 5128) out to 40 kpc
TL;DR: In this article , the authors investigate the overall mass distribution of a nearby giant elliptical galaxy, NGC 5128, using a discrete axisymmetric modeling of globular clusters as the halo tracers.
Posted Content
Early-type Galaxy Halo Dynamics inferred using the PN Spectrograph
Nigel G. Douglas,Aaron J. Romanowsky,Konrad Kuijken,Michael R. Merrifield,Nicola R. Napolitano,M. Arnaboldi,Kenneth C. Freeman,M. Capaccioli,Ortwin Gerhard +8 more
TL;DR: In this article, the structure of dark halos in elliptical galaxies was investigated using a new instrument called SIFT, which was designed to provide crucial data with which to probe the structure.
Gas Dynamics in the Milky Way: Second Pattern Speed
TL;DR: In this article, a gas flow model for the Milky Way inside the solar circle is presented, which is based on the COBE/DIRBE maps and on clump giant star counts in several bulge fields.