97 citations · 501 across the 22 of their papers we have counts for
21 papers
Winding, Unwinding, Rewinding the Gaia Phase Spiral
Neige Frankel, Marcin Semczuk, Teresa Antoja +10
The Gaia Space Satellite has transformed the field of Galactic Dynamics by collecting 6D phase space information for hundreds of millions of stars. In 2018, it enabled the discover…
Analogues of the Milky Way-Sagittarius interaction in the TNG50: effect on the Milky Way
Marcin Semczuk, Teresa Antoja, Alexandra Girón-Soto +1
The Sagittarius Dwarf Galaxy is undoubtedly being disrupted in the tidal field of the Milky Way. The Milky Way disc is also found to be in a state of disequilibrium. The role of th…
Spiral arms across stellar populations in simulations via the local dimension method
J. Ardèvol, M. Semczuk, T. Antoja +3
Context. The origin and nature of spiral arms remain unclear. Star forming regions and young stars are generally strongly associated to the spiral structure, but there are few quan…
Pattern speed evolution of barred galaxies in TNG50
Marcin Semczuk, Walter Dehnen, Ralph Schönrich +1
Galactic bars are found in the majority of disc galaxies. They rotate nearly rigidly with an angular frequency called pattern speed. Previous idealised simulations have shown that…
Comment on 'a slightly oblate dark matter halo revealed by a retrograde precessing Galactic disk warp' by Huang et al
Walter Dehnen, Ralph Schönrich, Ronald Drimmel +3
Huang et al. (2024) measured the derivative of the phase of the Galactic warp traced by classical Cepheids with respect to their age and interpreted it as the…
On the age distribution of Classical Cepheids in the Galaxy
Friedrich Anders, Chloé Padois, Marc Vilanova Sar +3
We revisit the problem of the positive correlation between age and Galactocentric distance seen in Galactic Classical Cepheids, which at first sight may seem counter-intuitive in t…
A new tidal scenario for double bar formation
Marcin Semczuk, Ewa L. Łokas, Adriana de Lorenzo-Cáceres +1
Double bars make up a significant fraction of barred galaxies. We propose a new formation scenario for double bars that involves tidal interactions. We demonstrate the viability of…
A twisted and precessing Cepheid warp in the outer Milky Way disc
Walter Dehnen, Marcin Semczuk, Ralph Schönrich
We examine the Galactic warp in a sample of all classical Cepheids with Gaia DR3 radial velocity. In each radial bin, we determine (1) the inclined plane normal to the mean orbital…
Measuring bar pattern speeds from single simulation snapshots
Walter Dehnen, Marcin Semczuk, Ralph Schoenrich
We describe methods to measure simultaneously the orientation angle and pattern speed from single snapshots of simulated barred galaxies. Unlike previous attempts, our appr…
Spiral arms and the angular momentum gap in Milky Way Cepheids
Marcin Semczuk, Walter Dehnen, Ralph Schoenrich +1
The angular-momentum distribution of classical Cepheids in the outer Milky Way disc is bi-modal with a gap at , cor…
Age-morphology dependence of the Milky Way boxy/peanut bulge seen in Mira variables
Marcin Semczuk, Walter Dehnen, Ralph Schoenrich +1
We analyse the distribution of Mira variable stars in the central region of the Milky Way. We find that with increasing period, i.e. decreasing age, the Miras shift towards negativ…
The small boxy/peanut structure of the Milky Way traced by old stars
Marcin Semczuk, Walter Dehnen, Ralph Schoenrich +1
We analyse the positions of RR Lyrae stars in the central region of the Milky Way. In addition to the overall bar shape detected previously, we find evidence for a peanut shaped st…
Tidally induced warps of spiral galaxies in IllustrisTNG
Marcin Semczuk, Ewa L. Lokas, Elena D'Onghia +3
Warps are common features in both stellar and gaseous disks of nearby spiral galaxies with the latter usually easier to detect. Several theories have been proposed in the literatur…
Tidally induced morphology of M33 in hydrodynamical simulations of its recent interaction with M31
Marcin Semczuk, Ewa L. Lokas, Jean-Baptiste Salomon +2
We present a hydrodynamical model of M33 and its recent interaction with M31. This scenario was previously proposed in the literature in order to explain the distorted gaseous and…
Tidal origin of spiral arms in galaxies orbiting a cluster
Marcin Semczuk, Ewa L. Lokas, Andres del Pino
One of the scenarios for the formation of grand-design spiral arms in disky galaxies involves their interactions with a satellite or another galaxy. Here we consider another possib…
Tidally induced bars of galaxies in clusters
Ewa L. Lokas, Ivana Ebrova, Andres del Pino +5
Using N-body simulations we study the formation and evolution of tidally induced bars in disky galaxies in clusters. Our progenitor is a massive, late-type galaxy similar to the Mi…
Simulations of tidally induced spiral arms
Marcin Semczuk, Ewa L. Lokas
The origin of grand design spiral structure in galaxies is still under debate but one of promising scenarios involves tidal interactions. We use N-body simulations to study the evo…
The resonant nature of tidal stirring of disky dwarf galaxies orbiting the Milky Way
Ewa L. Lokas, Marcin Semczuk, Grzegorz Gajda +1
Using N-body simulations we study the tidal evolution of initially disky dwarf galaxies orbiting a Milky Way-like host, a process known to lead to the formation of dwarf spheroidal…
Tidal evolution of disky dwarf galaxies: prograde versus retrograde orbits
Ewa L. Lokas, Marcin Semczuk
The formation of dwarf spheroidal galaxies in the Local Group from disky progenitors via tidal interaction with a bigger host is one of the most promising scenarios of their origin…
Andromeda II as a merger remnant
Ewa L. Lokas, Ivana Ebrova, Andres del Pino +1
Using N-body simulations we study the origin of prolate rotation recently detected in the kinematic data for And II, a dSph satellite of M31. We propose an evolutionary model for t…
Adventures of a tidally induced bar
E. L. Lokas, E. Athanassoula, V. P. Debattista +5
Using N-body simulations, we study the properties of a bar induced in a dwarf galaxy as a result of tidal interaction with the Milky Way. The dwarf is initially composed of a disk…