T. L. Hoffmann
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View article: Asteroid detection polar equation calculation and graphical representation
Asteroid detection polar equation calculation and graphical representation Open
Context. The observability of an asteroid from the ground depends on the distance to the Sun and the observer, on the phase angle, on the object shape, and on its surface reflectivity properties. Several magnitude systems have been propose…
View article: The outer stellar halos of galaxies: how radial merger mass deposition, shells, and streams depend on infall-orbit configurations
The outer stellar halos of galaxies: how radial merger mass deposition, shells, and streams depend on infall-orbit configurations Open
Galaxy mergers are a fundamental part of galaxy evolution. To study the\nresulting mass distributions of different kinds of galaxy mergers, we present a\nsimulation suite of 36 high-resolution isolated merger simulations, exploring a\nwide…
View article: Numerical models for the diffuse ionized gas in galaxies
Numerical models for the diffuse ionized gas in galaxies Open
Context. The diffuse ionized gas (DIG) constitutes the largest fraction of the total ionized interstellar matter in star-forming galaxies, but it is still unclear whether the ionization is driven predominantly by the ionizing radiation of …
View article: Surface abundances of CNO in Galactic O-stars: a pilot study with FASTWIND
Surface abundances of CNO in Galactic O-stars: a pilot study with FASTWIND Open
Context. Rotational mixing is known to significantly affect the evolution of massive stars; however, we still lack a consensus regarding the various possible modeling approaches and mixing recipes describing this process. The empirical inv…
View article: Numerical Models for the Diffuse Ionized Gas in Galaxies. II. Three-dimensional radiative transfer in inhomogeneous interstellar structures as a tool for analyzing the diffuse ionized gas
Numerical Models for the Diffuse Ionized Gas in Galaxies. II. Three-dimensional radiative transfer in inhomogeneous interstellar structures as a tool for analyzing the diffuse ionized gas Open
Aims: We systematically explore a plausible subset of the parameter space involving effective temperatures and metallicities of the ionizing stellar sources, the effects of the hardening of their radiation by surrounding leaky HII regions …
View article: Outer Stellar Halo Enrichment: where Mergers deposit their Mass and how Shells and Streams depend on Infall-Orbit Configurations
Outer Stellar Halo Enrichment: where Mergers deposit their Mass and how Shells and Streams depend on Infall-Orbit Configurations Open
Galaxy mergers are a fundamental part of galaxy evolution. To study the resulting mass distributions of different kind of galaxy mergers, we present a simulation suite of 36 high-resolution isolated merger simulations, exploring a wide ran…
View article: Carbon line formation and spectroscopy in O-type stars
Carbon line formation and spectroscopy in O-type stars Open
Context. The determination of chemical abundances constitutes a fundamental requirement for obtaining a complete picture of a star. Particularly in massive stars, CNO abundances are of prime interest, due to the nuclear CNO-cycle, and vari…
View article: The Outer Halos of Very Massive Galaxies: BCGs and their DSC in the Magneticum Simulations
The Outer Halos of Very Massive Galaxies: BCGs and their DSC in the Magneticum Simulations Open
Recent hydrodynamic cosmological simulations cover volumes up to Gpc 3 and resolve halos across a wide range of masses and environments, from massive galaxy clusters down to normal galaxies, while following a large variety of physical proc…
View article: The co-evolution of total density profiles and central dark matter fractions in simulated early-type galaxies
The co-evolution of total density profiles and central dark matter fractions in simulated early-type galaxies Open
We present evidence from cosmological hydrodynamical simulations for a\nco-evolution of the slope of the total (dark and stellar) mass density profile,\ngamma_tot, and the dark matter fraction within the half-mass radius, f_DM, in\nearly-t…
View article: Atmospheric NLTE models for the spectroscopic analysis of blue stars with winds
Atmospheric NLTE models for the spectroscopic analysis of blue stars with winds Open
Context. Extreme ultraviolet (EUV) and X-ray radiation emitted from wind-embedded shocks in hot, massive stars can affect the ionization balance in their outer atmospheres and can be the mechanism responsible for producing highly ionized a…
View article: Radiation-driven winds of hot luminous stars
Radiation-driven winds of hot luminous stars Open
Context. The uncertainty in the degree to which radiation-driven winds of hot stars might be affected by small inhomogeneities in the density leads to a corresponding uncertainty in the determination of the atmospheric mass loss rates from…