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The Subaru Seminar is usually held in Room 104 of the Hilo Base Facility, adjacent to the main lobby. Everyone is welcome to attend. If you are interested in giving a seminar, please contact Subaru seminar organizers (Tae-Soo Pyo, Sherry Yeh, Nagayoshi Ohashi) by email : sseminar_at_subaru.naoj.org (please change"_at" to @).

Date TBA

" PAndromeda - a dedicated M31 survey with Pan-STARRS 1 "

Chien-Hsiu Lee

(Subaru Telescope)


The high cadence, long-term PS1 Andromeda monitoring campaign (PAndromeda) yields well-sampled light curves that dramatically improve our understanding of microlensing and variables in M31. We apply stringent masking to the raw data, and employ our dedicated image subtraction pipeline to deliver high quality time-series measurements in the very crowded-field of M31. As a preliminary study, we discover 6 microlensing events in the inner bulge of M31. This demonstrates that deep data with exquisite time-resolution are essential to reveal microlensing events. We further turn the microlensing survey into a variable factory, producing catalogs of ~300 eclipsing binaries, ~ 2000 Cepheids, and ~ 4000 long period variables (LPVs). 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 provides a firm base to determine the Hubble constant at percent level. To fully exploit the value of PAndromeda, we welcome external collaborators, and can provide PS1 lightcurves with linked HST and Spitzer photometry upon request.


Seminars are also held at JAC, CFHT, and IfA.



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