国立天文台野辺山談話会 : NRO Colloquium
- 日時
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- 毎週火曜日 15:00-16:00
- 場所
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- 国立天文台野辺山宇宙電波観測所 輪講室 (本館2階)
都合により、日時・場所は変更になることがあります。
問い合わせ、講演希望・推薦は、談話会世話人までご連絡ください。
次回のお知らせ
| 日時 / 場所 | 2019/04/18 (Thu), 16:00-17:00 / 輪講室(Seminar room) |
|---|---|
| 講演者 | 辻本志保 (Shiho Tsujimoto, Keio University) |
| タイトル | Molecular Bubbles in the Galactic Center |
| 概要 | The central molecular zone (CMZ) of our Galaxy is characterized by a strong concentration of dense and warm molecular gas. Inspecting the CO data obtained with the NRO 45 m Telescope and the ASTE 10 m Telescope, we found the four high CO J=3-2/J=1-0 intensity ratio regions, at the Galactic longitudes l=+1.3°, 0°, −0.4°, and −1.2°. All of the high-ratio regions show extraordinary broad velocity widths (ΔV>50 km/s) despite their compact appearances (d<10 pc). The l = +1.3º region, one of the high ratio regions, contains nine expanding shells, which typically have very high kinetic energy comparable to tens or hundreds of supernova (SN) explosions. Given that two of these expanding shells are associated with SiO clumps, a series of SN explosions may be responsible for the formation of the expanding shells and then the l=+1.3º region is a molecular bubble containing a very massive star cluster. Another high ratio region, that is, the l=-1.2º region, shares the principal properties with the l=+1.3º region. The locations of these two in the plane of sky are roughly symmetric with respect to the Galactic center. The l=-1.2º region contains five expanding shells with huge kinetic energy. In addition, the SiO J=8-7 line emission was detected at the edge of the shells. These facts indicate that the l=-1.2º region may be another molecular bubble associated with an embedded massive star cluster. In this seminar, I will introduce the l=+1.3º and –1.2º regions and discuss the origin of them. |
| 講演資料など |
過去の談話会
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世話人
2019年度
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