演講資訊

摘要：

Galactic archaeology uses challenging ultra-deep observations of galactic stellar halos, tidal streams and dwarf satellites to constrain theories of high-redshift galaxy formation and the hierarchical aspect of the Lambda-CDM cosmogony, in which galaxies are built in part through the merging of smaller systems. In my talk, I will give an overview of this rapidly growing field and my ongoing work to make predictions for future surveys, including HSC, PFS and LSST. I will describe STINGS, a computational technique I have developed to achieve the combination of high resolution and large volume necessary to address the cosmological context of galactic archaeology. In particular, I will show how our programme of simulations with STINGS has given new quantitative insight into the contribution of satellite accretion to the structure of galaxies across scales ranging from the Milky Way to the most massive galaxy clusters. I also will introduce DESI Milky Way, an ambitious new Galactic survey using the Dark Energy Spectroscopic Instrument on the 4m Mayall telescope. DESI-MW will yield more than 10 million stellar spectra (30x times more than SDSS) over five years from 2019 and work in synergy with Gaia, LSST, 4MOST and PFS to revolutionize our knowledge of our own Galaxy’s stellar halo.