Unveiling the 3D shape of the Milky Way’s dark matter halo is critical to understanding its formation history and provides a fundamental test of the ΛCDM cosmological model. Functioning as an intermediary between the Galaxy and its satellites, the shape of dark matter halo also plays a key role in deciphering the long-standing problem of a ‘plane of satellites’ vertically aligned to the...
Stellar bars are non-axisymmetric structures located in the inner regions of galaxies; they
play a crucial role in the dynamical evolution of their host galaxies. They are observed in approximately 30\% of disc galaxies in the local Universe. In this study, we analyze the impact of different environments on bar formation and evolution using the TNG100 and TNG50 simulations from the...
Barred galaxies are an important branch of the Hubble sequence. In the past decades, significant efforts have been made to understanding the formation and evolution of barred galaxies. We develop a population-orbit superposition method, which can fully utilize stellar kinematics and stellar populations obtained from MUSE-like IFS data, to construct 3D models of edge-on barred galaxies. This...
We present a comprehensive numerical investigation into a minor merger event in the Andromeda Galaxy (M31), which we propose as a unified origin for four prominent stellar substructures: the Andromeda Giant Southern Stream (AGSS), Eastern Extent (EE), North-Eastern Shelf (NES), and Western Shelf (WS). This scenario provides a unified and self-consistent framework for understanding their...
We present an analytical model that embeds the cusp–core transition into the c–M relation of dark matter halos. The model accounts for deviations from scaling relations in galaxies, where central surface densities fall below c–M predictions. In contrast, UFDs retain high central densities consistent with CDM. Assuming supernova (SN) feedback drives the transition, the model predicts it...
The Milky Way Survey of the Dark Energy Spectroscopic Instrument (DESI) has so far observed three classical dwarf spheroidal galaxies (dSphs): Draco, Sextans and Ursa Minor. Based on the observed line-of-sight velocities and metallicities of their member stars, we apply the axisymmetric Jeans Anisotropic Multi-Gaussian Expansion modeling (JAM) approach to recover their inner dark matter...
Galaxy formation and evolution are shaped by the interplay of multiple astrophysical processes, including star formation, stellar feedback, and the cooling and retention of gas within a galaxy’s gravitational potential. These processes imprint distinct signatures on the chemical enrichment history of galaxies, making stellar metallicity a particularly sensitive tracer of their combined...
