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

为了弄清银河系背后本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的搜索。(1)银河系后面的IRAS星系的搜索（1994-1996）IRAS星系被定义为在60ma时通量密度大于0.6 Jy。在远红外波段，星系消光是如此之低，以至于即使在银河系区域也有可能探测到IRAS星系。我们获得了具有与已知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星系样物体。然后我们对尽可能多的候选星系进行了红移调查。我们的结果显示，在超星系坐标的x轴上，存在5个几乎垂直横跨银河系的星系分布的丝状结构，一个在Puppis的星系团，其速度约为2000 km/s，以及一个大小为100 Mpc的大尺度结构。我们还阐明了局部空洞的结构。(2)银河系中心区域星系的目视搜索（1995-1996）IRAS星系搜索的结果还表明，银河系中心附近有一个明显的大空洞。为了确定虚空的真实性，我们利用施密特平板和一个带有大移动台的显微镜对星系进行了视觉搜索，这是由这项资助获得的。我们在大约1050平方度的范围内探测到大约12000个候选星系。现在我们要对这些天体进行红移观测。我们可以通过后续的红移观测来澄清该区域的大尺度结构。

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.