A Study of Large Scale structures of Galaxy Distribution in the Local Universe by means of Galaxy search in the Milky Way Region

银河系区域星系搜索研究本地宇宙星系分布的大尺度结构

• 批准号: 06452022
• 负责人: SAITO Mamoru
• 金额: $ 4.93万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06452022/
• 关键词: Local Universe; Large Scale structure; Galaxy search; Milky Way; 銀河; 宇宙の大規模構造; 天の川領域; 近傍宇宙; 銀河分布の大規模構造

In order to clarify the large-scale structures of galaxy distribution of the Local Universe behind the Milky Way, we performed two systematic search for galaxies in this region.(1) A search for IRAS galaxies behind the Milky Way (1994-1996)IRAS galaxies are defined to have flux densities larger than 0.6 Jy at 60 mum. At far-infrared wavelengths Galactic extinction is so low that detection of IRAS galaxies is possible even at the Milky Way region. We picked up IRAS point sources with far-infrared features similar to known IRAS galaxies and identified optically galaxy-like objects on the positions of the far-infrared point souces. Then we carried out a redshift survey of the galaxy candidates as many as possible.Our results show the presence of five filamentary structures of galaxy distribution almost vertically crossing the Milky Way, a galaxy cluster at Puppis with about 2000 km/s, and a large-scale structure with a size of 100 Mpc along X-axis of the supergalctic coordinate. We also clarify the structure of the Local Void.(2) A visual search for galaxies at the Galactic center region (1995-1996)The results of the IRAS galaxy search also indicate an apparent largy nearby void toward the Galactic center. To ascertain the reality of the void, we carried out a visual search for galaxies by means of Schmidt plates and a microscope with a large movable stage, which was obtained by this Grant-in-Aid. We detected about 12000 galaxy candidates in about 1050 square degrees surveryed. Now we are going to carry out a redshift survery of these objects. We may clarify large-scale structures in this region by the follow-up redshift survery.

为了弄清银河系背后本地宇宙星系分布的大尺度结构，我们对该区域的星系进行了两次系统搜索。(1)银河系背后IRAS星系搜索(1994-1996)IRAS星系被定义为 60 微米时的通量密度大于 0.6 Jy。在远红外波长处，银河消光非常低，即使在银河系区域也可以检测到 IRAS 星系。我们拾取了具有与已知 IRAS 星系相似的远红外特征的 IRAS 点源，并在远红外点源的位置上识别了光学上的类星系物体。然后我们对尽可能多的候选星系进行了红移调查。我们的结果表明存在五个几乎垂直穿过银河系分布的丝状结构的星系，一个位于船尾座的星系团，速度约为2000公里/秒，还有一个巨大的星系团。沿超银河系坐标 X 轴尺寸为 100 Mpc 的尺度结构。我们还阐明了局地空洞的结构。(2)银心区域星系的目视搜索(1995-1996)IRAS星系搜索的结果也表明银心附近存在明显的大型空洞。为了确定虚空的真实性，我们利用施密特板和带有大型可移动载物台的显微镜对星系进行了目视搜索，该显微镜是由本次资助获得的。我们在大约 1050 平方度的调查范围内发现了大约 12000 个候选星系。现在我们将对这些天体进行红移观测。我们可能会通过后续的红移测量来澄清该区域的大尺度结构。

项目成果

Chamaraux, P. et al.: "A search for IRAS galaxies behind the Taurus molecular clouds" Astron. Astrophys.299. 347-352 (1995)

Chamaraux, P. 等人：“寻找金牛座分子云后面的 IRAS 星系”Astron。

Chamaraux, P., et al.: "A search for IRAS galaxies behind the Traurus molecular clouds" Astron.Astrophys.299. 347-352 (1995)

Chamaraux, P. 等人：“寻找 Traurus 分子云后面的 IRAS 星系”Astron.Astrophys.299。

Adel T.Roman: "A Search for Galaxies behind the Milky Way at Aguils and Sagittarius" Publication of the Astronomical Society of Japan. 48・5. 679-690 (1996)

Adel T.Roman：“寻找阿吉尔斯和人马座银河系背后的星系”，日本天文学会出版物 48・5（1996 年）。

Iwata, I. et al.: "A Near-Infrared Imaging Search for Invisible Galaxies behind the Milky Way" Publ. Astron. Soc. Japan,. 49. 47-58 (1997)

Iwata, I. 等人：“近红外成像搜索银河系后面的隐形星系”Publ。

Kouichiro Nakanishi: "Search and Redshift Survey for IRAS Galaxies behind the Milky Way and the Stucture of the Local Void" The Astrophysical Journal,Supplemant Series. (accepted). (1997)

Kouichiro Nakanishi：“银河系背后的 IRAS 星系的搜索和红移调查以及局部空洞的结构”《天体物理学杂志》增刊系列。