Ortwin Gerhard

TL;DR: In this paper, a stochastic halo formation model is introduced to compute the early chemical enrichment of the interstellar medium (ISM) of the halo, showing an element abundance pattern integrated over the initial mass function.

TL;DR: In this article, the authors reported the discovery of a small spheroidal galaxy on deep F606W and F814W Hubble Space Telescope images of a Virgo intracluster field.

TL;DR: In this paper, the authors analyzed six X-ray bright elliptical galaxies, observed with Chandra and XMM-Newton, and approximate their gravitational potentials by isothermal spheres phi(r)=v_c^2 ln(r) over a range of radii from ~0.5 to ~25 kpc.

TL;DR: In this paper, the authors constructed made-to-measure models fitting new VIRUS-W IFU bulge stellar kinematic observations, the IRAC-3.6 mu m photometry, and the disc's HI rotation curve.

TL;DR: In this article, a moving prior entropy regularization (MPR) method is proposed to construct smooth models from noisy data without erasing global phase-space gradients, which is based on determining from the particles a distribution of priors in phase space, which are updated in parallel with weight adaptation.