维基百科

File:NGC7020 - Iotw2224a.jpg

原始文件 （2,238 × 1,863像素，文件大小：1.12 MB，MIME类型：image/jpeg）

摘要

描述
English: A Hexagonal Galactic Center

NGC 7020, a barred lenticular galaxy in the southern constellation Pavo, holds a geometric mystery. Clear but subtle in this image from Gemini South, one half of the International Gemini Observatory, a Program of NSF’s NOIRLab, the core of NGC 7020 is visibly hexagonal in shape. A hexagon is not a common shape for any celestial body, let alone an entire galaxy. To form a hexagonal structure such as this, a considerable number of stars must orbit in a very narrow band. This orbital path includes two denser regions of stars seen on the left and right sides of the hexagon, which are known as “ansae”. NGC 7020’s unusual shape seems to be the product of a very rare orbital resonance, or an as-yet-unknown phenomenon.

The 8-meter Gemini South telescope is located on Cerro Pachón in the Chilean Andes. Along with the other half of the international Gemini observatory, Gemini North in Hawai‘i, these two telescopes give us a deep view of the entire night sky.

Credit: International Gemini Observatory/NOIRLab/NSF/AURA/H. Dottori, R. J. Díaz, G. Gimeno

Image processing: T.A. Rector (University of Alaska Anchorage/NSF’s NOIRLab), M. Zamani (NSF’s NOIRLab) & D. de Martin (NSF’s NOIRLab) 

Position (RA):    	21 11 19.85
Position (Dec):  	-64° 1' 32.54"
Field of view:      	5.44 x 4.53 arcminutes
Orientation:       	North is 300.0° right of vertical


Colors & filters Band Wave-length Tele-scope Optical g 475 nm Gemini South GMOS-S Optical r 630 nm Gemini South GMOS-S Optical i 780 nm Gemini South GMOS-S Optical H-alpha 656 nm Gemini South GMOS-S

.
日期 June 15, 2022 (release)
来源 https://noirlab.edu/public/images/iotw2224a/
作者

Credit: International Gemini Observatory/NOIRLab/NSF/AURA/H. Dottori, R. J. Díaz, G. Gimeno

Image processing: T.A. Rector (University of Alaska Anchorage/NSF’s NOIRLab), M. Zamani (NSF’s NOIRLab) & D. de Martin (NSF’s NOIRLab)
授权
(二次使用本文件)
This media was created by the National Optical-Infrared Astronomy Research Laboratory (NOIRLab).
Their website states: "Unless specifically noted, the images, videos, and music distributed on the public NOIRLab website, along with the texts of press releases, announcements, images of the week and captions; are licensed under a Creative Commons Attribution 4.0 International License, and may on a non-exclusive basis be reproduced without fee provided the credit is clear and visible."
To the uploader: You must provide a link (URL) to the original file and the authorship information if available.
w:zh:知识共享
署名
本文件采用知识共享署名 4.0 国际许可协议授权。
您可以自由地：
  • 共享 – 复制、发行并传播本作品
  • 修改 – 改编作品
惟须遵守下列条件：
  • 署名 – 您必须对作品进行署名，提供授权条款的链接，并说明是否对原始内容进行了更改。您可以用任何合理的方式来署名，但不得以任何方式表明许可人认可您或您的使用。

说明

添加一行文字以描述该文件所表现的内容

此文件中描述的项目

描繪內容

文件历史

点击某个日期/时间查看对应时刻的文件。

日期/时间缩⁠略⁠图大小用户备注
当前2022年6月16日 (四) 00:482022年6月16日 (四) 00:48版本的缩略图2,238 × 1,863（1.12 MB）Fabian RRRR== {{int:filedesc}} == {{Information |description={{en|1='''A Hexagonal Galactic Center NGC 7020, a barred lenticular galaxy in the southern constellation Pavo, holds a geometric mystery. Clear but subtle in this image from Gemini South, one half of the International Gemini Observatory, a Program of NSF’s NOIRLab, the core of NGC 7020 is visibly hexagonal in shape. A hexagon is not a common shape for any celestial body, let alone an entire galaxy. To form a hexagonal structure such as this,...

以下页面使用本文件：

全域文件用途

以下其他wiki使用此文件：

元数据

此文件中包含有扩展的信息。这些信息可能是由数码相机或扫描仪在创建或数字化过程中所添加。

如果此文件的源文件已经被修改，一些信息在修改后的文件中将不能完全反映出来。

检索自“https://zh.wikipedia.org/wiki/File:NGC7020_-_Iotw2224a.jpg”