Netherlands Astronomy Conference 2026

The missing baryons, that is, the yet-unobserved ordinary matter in the large-scale structures of the Universe, have been shown by simulations to reside mostly in filaments of the cosmic web. As this phase of the cosmic gas is becoming observable, currently in the outskirts of galaxy clusters and in short filaments, so-called bridges, it is becoming crucial to understand their detailed gas...

We present a morphological analysis of dwarf galaxies in the Perseus cluster using Euclid Early Release Observations (ERO), exploiting the VIS instrument's diffraction-limited resolution and exceptional surface brightness sensitivity. Working from the ~1100-dwarf ERO catalog of Marleau et al. (2025), we develop a novel cumulative light fraction approach for measuring isophotal shapes in low...

The discovery of the phase space spirals in the Solar neighborhood in Gaia Data Release 2 has prompted various attempts to understand their origin. A source of bending waves, which has been neglected as a cause of the phase spiral, is irregular gas inflow along the warp.
We aim to study whether perturbations by the gas warp could induce phase spirals. Accounting for this additional formation...

The extended hot ($T=10^6$ K) gas phase of the circumgalactic medium (CGM) is an essential component for studying the baryon cycle of late-type galaxies, because it could supply the galaxy with gas to sustain star formation and possibly contains many of the 'missing' baryons.
Using a simple semi-analytic model based on hydrostatic equilibrium and the latest eROSITA observations, we evolve the...

In the interstellar medium, multiple processes in star formation and
evolution deposit, clear, and reorganize dust molecules around stellar
populations. In the Physics at High Angular Resolution in Nearby
Galaxies (PHANGS) surveys, stellar associations trace loosely bound
young stars in recent star formation sites. Leveraging the synergy
between HST and JWST, we measure dust extinction of...