Conveners
Structure 4
- Joop Schaye (Leiden Observatory)
We present the reconstruction of the Cosmic Web from the galaxy distribution using the convolutional-neural-network-based deep-learning algorithm. We find the mapping between the position and velocity of galaxies and the Cosmic Web using the results of the state-of-the-art cosmological galaxy simulations, and demonstrate the cosmic web structure across the sky, and even some connections...
Low-mass dark matter halos perturb the Einstein rings of strong gravitational lenses. By means of high-resolution imaging and precision modeling, we can directly measure the masses, abundances, and internal density profiles of these halos. In this talk I will present a systematic overview of our multi-year effort to detect dark subhalos: from the development of the PyAutoLens software suite,...
Understanding how galaxies connect to their host dark matter halos is key to uncovering the physics of galaxy formation and the growth of cosmic structure. In this talk, I present two recent studies that use weak gravitational lensing and galaxy clustering to explore this connection from complementary perspectives. In the first part, we go beyond the traditional stellar–halo mass relation and...
The tidal field of the host halo strips not only the dark matter of the subhalo but also its embedded satellite galaxies. This process alters the stellar-mass–halo-mass relation for satellites compared to isolated galaxies. The co-evolution of stellar and dark matter components determines the fate of the faintest galaxies: will they be disrupted along with their host subhalo, or survive as...
Dark matter is proposed to dominate the mass-energy content of the Universe, and its nature can be studied via large-scale structure probes, such as the unresolved gamma-ray background (UGRB) using cosmological methods. We investigate the cross-correlation between energy-binned intensity maps of the UGRB from 15 years of Fermi-LAT data and tomographic weak gravitational lensing data from the...
