Abstract:
Recent observations with JWST have unveiled two surprising populations in the early Universe: giant bulgeless disk galaxies (GBDs), which challenge popular theories of galactic disk formation; and little red cots (LRDs), compact, galaxy-less AGN likely powered by massive black holes. in this talk, l will present two complementary investigations that aim to explain these extreme svstems within the context of their host dark-matter halos. First, using ACDM cosmological simulations, l explore the rare conditions that give rise to GBDs at z~3. These galaxies, analogs of the observed "Big Wheel", form in halos with high spin, low concentration, and remarkable coherence between disk and circum-galactic medium, in proto-cluster environments. Second, l introduce a new seeding mechanism for supermassive black holes based on gravothermal core-collapse in self-interacting dark-matter (SlDM) halos. This process, occurring only in high-concentration halos at early times, provides a naturaI explanation for the abundance and properties of LRDs. Together, these studies shed light on how the structures and dvnamics of dark-matter halos can shape both the most extended and the most compact svstems at cosmic dawn/morning.

Biography:
Fangzhou Jiang, assistant professor at KIAA Peking University, studies galaxy formation and evolution, focusing on the interplay between galaxies and their dark-matter halos across cosmic time. He combines large-scale cosmological simulations and semi-analytical models to explore diverse phenomena, from galaxy morphology to cosmological small-scale structures. Fangzhou received his PhD in Astronomy from Yale University, and was a postdoctoral fellow at Hebrew University of Jerusalem, Caltech, and Carnegie Observatories. 
Webpage:fzjiang.com

Alternative online link：https://meeting.tencent.com/dm/nRNPWwIblFVi

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