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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 : (please change"_at" to @).

March 27, Friday, 11:00 am in 104

" The current status of our Galactic Archaeological Study of Nearby Galactic Halos with Hyper Suprime-Cam (HSC) "

Mikito Tanaka

(Tohoku University)

We have performed archaeological surveys of nearby galaxies using the Subaru telescope from the two perspectives in order to untangle how halos of galaxies form. The one is to understand fine structures such as stellar population, luminosity functions of stellar streams, metallicity gradients, the distribution of satellite galaxies through wide-field observations of the Milky Way and the Andromeda galaxy (M31). The other one is to understand universal formation scenario of halos through comparisons these structures which we have found in the Local Group galaxies with structures of halos in the Local Volume galaxies, that is, galaxies beyond the LG. Then, we have been conducting the wide-field and deep photometric surveys of M31's halo (S14B) and the NGC4631 group (S14A, S15A) with HSC from last year. Subaru/HSC makes us to draw a less-contaminated stellar density map based on Red Clump stellar populations of M31's halo, and we can detect some faint substructures in our HSC field which are not found in the previous CFHT/MegaCam survey as a preliminary result. On the other hand, the NGC4631 group is an on-going interacting system, and is important to understand the origin of the verity of galactic halos. Although the observation of S14A was under the very poor condition, we newly detect 8 dwarf galaxies around NGC4631 galaxies based on visual inspection. We find that a positive correlation between total absolute magnitude and half-light radius of these dwarf galaxies is similar to the one of the Local Group. In this seminar, I'd like to introduce the current status of our galactic archaeological study.

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

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