No.31 Seminar ： Past Activity of the Central Region in the Milky Way Galaxy with X-ray Observation
- Masayoshi NOBUKAWA（The Hakubi Center）
- 2011/12/06 4:00pm
- The Hakubi Center (iCeMS West Wing 2F, Seminar Room)
- English
Summary
A super-massive black hole, Sagittarius A* (A-star), whose mass is 4 million times larger than the Sun, sits on the center of the Milky Way Galaxy including the Sun system. Huge gravity of Sagittarius A* binds dynamics of the Milky Way Galaxy and attracts many stars and gases in the surrounding area. However, it has been a mystery that Sagittarius A* is less active than other super-massive black holes. We have observed the vicinity of Sagittarius A* using an X-ray scientific satellite Suzaku since the launch on 2005. As a result, we discovered molecular clouds emitting intense X-rays 300 hundred light-years apart from Sagittarius A*. From the detailed study, we revealed that the molecular clouds reflected X-rays which Sagittarius A* had emitted 300 hundreds years ago. In the Hakubi seminar, I would like to introduce X-ray observations, and we will discuss the high activity in the central region of the Milky Way Galaxy.