Recent observations of high-redshift galactic disks (z≈ 1–3) show a strong negative trend in
the dark-matter (DM) fraction f DM with increasing baryon surface density. For this to be true …

In 2018, the ESA Gaia satellite discovered a remarkable spiral pattern ('phase spiral') in the
z− Vz phase plane throughout the solar neighbourhood, where z and Vz are the …

The recent discovery of barred spiral galaxies in the early Universe (z> 2) poses questions
of how these structures form and how they influence galaxy evolution in the early Universe …

Context. Spiral galaxies are very common in the local Universe, but their formation,
evolution, and interplay with bars remain poorly understood after more than a century of …

While bars are common in disk galaxies, their formation conditions are not well understood.
We use N-body simulations to study the formation and evolution of a bar in isolated galaxies …

The Galactic bulge is critical to our understanding of the Milky Way. However, due to the lack
of reliable stellar distances, the structure and kinematics of the bulge/bar beyond the …

We study the origin of the interstellar object 1I/2017 U1 'Oumuamua by juxtaposing
estimates based on the observations with simulations. We speculate that objects like …

Context. Stellar bars are known to gradually funnel gas to the central parts of disk galaxies. It
remains a matter of debate why the distribution of ionized gas along bars and in the …

We use numerical simulations to analyse the stellar bar evolution in spinning dark matter
(DM) haloes. Previous works have shown the halo spin has a substantial effect on bar …

We construct a model for the Milky Way (MW) Galaxy composed of a stellar disc and bulge
embedded in a dark-matter halo. All components are modelled as N-body systems with up to …