演講資訊

摘要：

Galaxies lose gas through winds, and figuring out what actually drives those winds (stellar radiation, winds from massive stars, or supernova explosions) is harder than it sounds. In most star-forming galaxies, stars of many different ages are mixed together, so their spectra end up blending signatures from all these feedback sources at once, making it nearly impossible to isolate any one of them. In this talk, I'll go through a recent paper by Saldana-Lopez et al., 2026 (https://doi.org/10.48550/arXiv.2604.13865) that gets around this problem in a pretty clever way: using the host galaxies of superluminous supernovae (SLSNe-I) as probes. These supernovae come from extremely massive stars that explode within just a few million years of their birth, well before ordinary supernovae have had time to go off in the same galaxy. That means any outflow seen in their spectra has to be driven by winds and radiation pressure alone, not by supernovae. Using VLT/X-shooter spectra of six SLSN-I host galaxies, this paper measures how fast this gas is moving and how much mass and energy it's carrying, and finds that these early outflows are notably weaker and slower than the winds seen in more mature starburst galaxies. I'll walk through their data, how they made these measurements, and what the results mean for how we think galaxies regulate star formation.