演講資訊

摘要：

The 3-year, high-cadence PS1 Andromeda survey yields well-sampled light curves that improve our understanding of microlensing and variables in M31. As a preliminary study, we discover 6 microlensing events in the inner bulge of M31. This demonstrates that deep data with good temporal resolution are essential to reveal microlensing events. We also explore the data for variability studies, and produce catalogs of ~300 eclipsing binaries, ~2000 Cepheids and other variables. We select bright eclipsing binaries for spectroscopic follow-up, to obtain a direct distance estimate of M31. We astromatrically align the multi-band Panchromatic Hubble Andromeda Treasury (PHAT) data to our PS1 images, and derive precise period-luminosity relation (PLR) for the Cepheids. The accurate distance and precise PLR will render M31 a distance anchor and help to reduce the error budget of Hubble constant. To fully exploit the value of PAndromeda, we welcome external collaborators, and can provide PS1 light curves with linked HST photometry upon request.