12月21日（月）13：30～15：00 太陽系小天体セミナー 南棟2階会議室
Dec 21 Mon Solar System Minor Body Seminar Conference Room, South Bldg.2F
12月22日（火）15：00～16：00 VLBIコロキウム 中央棟（南）2F VLBIセミナー室
Dec 22 Tue VLBI Colloquium VLBI Seminar Room, Main Bldg. (South) 2F
詳細は以下をご覧下さい。
12月21日(月)
- キャンパス
- 三鷹
- セミナー名
- 太陽系小天体セミナー
- 臨時・定例の別
- 定例
- 日時
- 12月21日（月曜日）13時30分～15時
- 場所
- 南棟２階会議室
- 講演者
- 匠あさみ・土屋智恵
- 連絡先
- 名前：渡部潤一
- 備考
- テレビ会議またはスカイプによる参加も可
12月22日(火)
- キャンパス
- 三鷹
- セミナー名
- VLBIコロキウム
- 臨時・定例の別
- 臨時
- 日時
- 12月22日（火曜日）15:00～16:00
- 場所
- 中央棟(南)2階VLBIセミナー室
- 講演者1
- 木村靖伊奈 (Kimura Seina)
- 所属
- Yamaguchi University
- タイトル
- Survey for black holes near Sgr A * by high sensitivity VLBI observation
- Abstract
-
Supermassive black holes (SMBHs) exist in the center of many galaxies, and they are observed as AGN. The formation process of the SMBHs, however, remains unclear at present. Black hole merging caused by the collision and merging of galaxies is considered to be one of the formation mechanism of the SMBHs. In this process, the wandering BHs which formed in minor companion is existed in the host galaxy, such a wandering black hole candidate has already been found in other galaxies.If SMBHs evolve by merger, there is a possibility that relatively massive black holes wander in the vicinity of the Sgr A*. The aim of the study is to find the black holes which proves black holes merger near Sgr A *.
We have performed high sensitivity VLBI observation for 5 compact radio sources toward the galactic center that was selected from VLA survey catalog, and 4 sources was detected. We report on this result, the current analysis situation and future observation plans. - 講演者2
- 中村拡 (Nakamura Hiromu)
- 所属
- Yamaguchi University
- タイトル
- Can 6.7 GHz methanol maser with high time variation be associated with outflow ?
- Abstract
-
Many studies of occurrence region of 6.7 GHz methanol maser associated with the high-mass star forming regions have been conducted. Their occurrence region is thought to be the accretion disk or outflow. However, only few methanol masers are associated with outflow and its debate is not yet settled. If we can increase the sample of methanol maser associated with outflow, methanol maser can be used as a tracer of both the accretion disk and outflows.
Therefore we focus on methanol maser with high time variation to increase the sample sources, which spectral profile changes by changes of the velocity structure. Because the 22 GHz water maser which is associated with outflow shows such a highly time variation of spectrum, the methanol masers with high time variation also may be associated with the outflow. However, only Mon R2 shows changes in the spectral profile. So, we searched sources showing changes in the spectral profile using Yamaguchi 32m radio telescope. As a result, we found 13 candidate sources.
Next step is that we confirm whether methanol maser associated with outflow. Therefore we compare the absolute position and the proper motion of methanol and water masers. We have already submitted proposal of the proper motion observations of methanol maser and water maser to JVN and VERA, respectively. Selected sources are two sources out of 13 sources (G11.49-1.48, G59.78+00.06).
By their observations, we confirm whether methanol maser of G11 and G59 associated with outflow and investigate which part of outflow methanol maser associated. Eventually, we discuss about structure of outflow and relationships of disk and outflow using methanol and water maser. - Language
- Japanese
- 連絡先
- 名前：酒井 大裕
- 備考
- テレビ参加可
以上