O. Gerhard

Publications394
h-index66
Citations15,820
Highly Influential Citations1,583
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The Galaxy in Context: Structural, Kinematic, and Integrated Properties
Our Galaxy, the Milky Way, is a benchmark for understanding disk galaxies. It is the only galaxy whose formation history can be studied using the full distribution of stars from faint dwarfs to…
Dynamical Family Properties and Dark Halo Scaling Relations of Giant Elliptical Galaxies
Based on a uniform dynamical analysis of the line-pro—le shapes of 21 mostly luminous, slowly rotating, and nearly round elliptical galaxies, we have investigated the dynamical family relations and…
AN EXTREMELY TOP-HEAVY INITIAL MASS FUNCTION IN THE GALACTIC CENTER STELLAR DISKS
We present new observations of the nuclear star cluster in the central parsec of the Galaxy with the adaptive optics assisted, integral field spectrograph SINFONI on the ESO/VLT. Our work allows the…
From Rings to Bulges: Evidence for Rapid Secular Galaxy Evolution at z ~ 2 from Integral Field Spectroscopy in the SINS Survey
We present Hα integral field spectroscopy of well-resolved, UV/optically selected z ~ 2 star-forming galaxies as part of the SINS survey with SINFONI on the ESO VLT. Our laser guide star adaptive…
Evidence for Warped Disks of Young Stars in the Galactic Center
TLDR
It is shown that half of the W-R/O stars are compatible with being members of a clockwise rotating system, which is compatible with a coherent structure such as stellar filaments, streams, small clusters or possibly a disk in a dissolving state.
Stellar dynamics in the Galactic centre: Proper motions and anisotropy
We report a new analysis of the stellar dynamics in the Galactic Centre, based on improved sky and line-of-sight velocities for more than 100 stars in the central few arcseconds from the black hole…
Understanding the kinematics of Galactic Centre gas
A coherent picture is constructed on the Galaxy's H I, CO and CS emissions in the region |l| ≤ 10°, |b| ≤ 0.5°. The flow of gas at the Galactic Centre is dominated by a bar that has corotation at r =…
Mapping the three-dimensional density of the galactic bulge with VVV red clump stars
The inner Milky Way is dominated by a boxy, triaxial bulge which is believed to have formed through disk instability processes. Despite its proximity, its large-scale properties are still not very…
The structure of the Milky Way's bar outside the bulge
While it is incontrovertible that the inner Galaxy contains a bar, its structure near the Galactic plane has remained uncertain, where extinction from intervening dust is greatest. We investigate…
Spiral arms, bar shape and bulge microlensing in the Milky Way
A new model for the luminosity distribution in the inner Milky Way is found, using a non-parametric penalized maximum-likelihood algorithm to deproject a dereddened COBE/ DIRBE L-band map of the…
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