令和8(2026)年度談話会 の履歴(No.2)

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IoA_Seminar

講演リスト†

No. 439 : Apr. 16, 2026 (Thu) 15:00-16:00†

Place: Room 1109, Department of Astronomy, University of Tokyo /Zoom (hybrid)†

Speaker: Joss Bland-Hawthorn (Director, Sydney Institute for Astronomy, U Sydney)†

Title: The long-term evolution of turbulent discs in high-redshift galaxies†

Language: 英語 (English)

Abstract: Most disc galaxies go through an early epoch of being "gas rich," an era that is being actively explored today through ALMA and JWST observations. This high gas-fraction phase got going much sooner (z > 3) than anticipated by cosmological N-body simulations. A new class of controlled (Nexus) simulations of these early times reveals that these turbulent discs have extraordinary properties. Unexpectedly, m=2,3 spiral arms, stellar and gaseous bars, even X-shaped/peanut bulges, all form under these conditions. The high gas content accelerates stellar migration and stabilizes the disc against buckling. Moreover, baryon sloshing driven by strong feedback gives rise to thick stellar discs, a likely origin of alpha-enriched thick stellar discs observed today. The sloshing gives rise to specific signatures that may already be observable in ALMA data. We discuss the implications of the new work on galaxy studies.