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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Dynamical masses, time-scales, and evolution of star clusters
TL;DR: In this article, a review discusses dynamical methods for determining the masses of star clusters, including evaporation, mass segregation, core collapse, tidal shocks, dynamical friction and merging.
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The Outer Halos of Early-Type Galaxies
TL;DR: In this article, a brief report is given of some recent work on the kinematics, angular momentum, and mass distributions of simulated ETG halos, and of corresponding properties of observed halos measured with planetary nebulae (PNe) as tracers.
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26Al kinematics: superbubbles following the spiral arms? Constraints from the statistics of star clusters and HI supershells
Martin Krause,Roland Diehl,Yiannis Bagetakos,Yiannis Bagetakos,Elias Brinks,Andreas Burkert,Ortwin Gerhard,Jochen Greiner,K. Kretschmer,Thomas Siegert +9 more
TL;DR: In this article, the authors derived energy output and 26Al mass of star clusters as a function of the cluster mass via population synthesis from stellar evolutionary tracks of massive stars, and linked this to the size distribution of HI supershells and assessed the properties of likely 26Al-carrying superbubbles.
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An [$\alpha$/Fe]-enhanced thick disk in a Milky Way Analogue
Nicholas Scott,Jesse van de Sande,Sanjib Sharma,Joss Bland-Hawthorn,Kenneth C. Freeman,Ortwin Gerhard,Michael R. Hayden,Richard M. McDermid +7 more
TL;DR: In this article, the authors present VLT-MUSE observations of UGC 10738, a nearby, edge-on Milky Way-like galaxy, and demonstrate through stellar population synthesis model fitting that UGC10738 contains alpha-rich and alpha-poor stellar populations with similar spatial distributions to the same components in the Milky Way.
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Milky Way Gas Dynamics
P. Englmaier,Ortwin Gerhard +1 more
TL;DR: The Milky Way is made up of a central bar, a disk with embedded spiral arms, and a dark matter halo as mentioned in this paper, and the properties of the Milky Way are discussed in detail.