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2018.8.20~8.26

         

8月22日(水)16:00~17:00  国立天文台談話会      大セミナー室  
Aug 22 Wed          NAOJ Seminar       Large Seminar Room 

詳細は以下をご覧下さい。

8月22日(水)

Campus
Mitaka
Seminar
NAOJ seminar
Regularly Scheduled/Sporadic
Scheduled
Date and time
Wed 22 Aug. 16:00~17:00
Place
Large Seminar Room
Speaker
Kawata Daisuke
Affiliation
University College London
Title
Galactic Dynamics with Gaia DR2
Abstract
European Space Agency’s Gaia mission has made the 2nd data release (Gaia
DR2) on 25th April 2018. Gaia DR2 provides position, parallax and proper
motions for more than one billion stars with unprecedented accuracy and
radial velocity for about 7 million bright stars. In this talk, I will
summarise our Galactic dynamics studies with Gaia DR2. First, I will show
that for the first time Gaia DR2 has revealed the velocity structures of
the Galactic stellar disk in the large range of radii, 5<Rgal<12 kpc. We
found many diagonal ridges in the Rgal vs. Vrot map. We also demonstrate
that these features can be explained by the transient and recurrent spiral
arms. Second, I will talk about our search for dwarf galaxies in Fermi-LAT
extended unassociated source fields, and discuss implications for
annihilating dark matter. Finally, I will talk about the prospect of the
next Gaia data releases and the future astrometry missions, including
Small-JASMINE and Gaia NIR.

Facilitator
-Name:Yano, Taihei

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