Conveners
Galaxies 3
- Yingjie Peng (KIAA, Peking University)
Galaxy–mass offsets in cluster collisions were once considered a promising signal for constraining the self-interaction cross-section of dark matter. However, previous studies based on these offsets have been hindered by large measurement uncertainties and poorly constrained merger phases and geometries. In this work, we overcome these challenges and present a robust constraint on the dark...
Strong lensing mass reconstructions of several galaxy clusters obtained by combining imaging from HST and JWST and spectroscopy from MUSE show that cluster galaxies are much more compact than found in high-resolution hydrodynamical simulations. In this talk, I will discuss the possible origins of this discrepancy, whether it can be due to how galaxy formation is modeled in the simulations, to...
Galaxies are embedded within larger halos of (predominantly) dark matter. Although gravitational lensing studies have provided a comprehensive understanding of the distribution of dark matter in these halos, their baryonic content remains less well understood.
One key baryonic component in galactic halos is dust, which can be transported from the interstellar medium to the circumgalactic...
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...
Supermassive black holes (SMBHs) residing at the centres of massive galaxies are intricately linked to their hosts through a co-evolutionary process. For massive elliptical galaxies, this connection is typically described by the $M_\text{BH}-\sigma_e$ relation, which ties the SMBH mass ($M_\text{BH}$) to the host’s central stellar velocity dispersion ($\sigma_e$). However, traditional methods...
