File:Cloudlets swarm around our local supermassive black hole.tif
![File:Cloudlets swarm around our local supermassive black hole.tif](http://images.weserv.nl/?url=//upload.wikimedia.org/wikipedia/commons/thumb/a/ab/Cloudlets_swarm_around_our_local_supermassive_black_hole.tif/lossy-page1-542px-Cloudlets_swarm_around_our_local_supermassive_black_hole.tif.jpg)
原始檔案 (806 × 892 像素,檔案大小:898 KB,MIME 類型:image/tiff)
摘要
描述Cloudlets swarm around our local supermassive black hole.tif |
English: This image from the Atacama Large Millimeter/submillimeter Array (ALMA) shows the area surrounding Sagittarius A*, the supermassive black hole that lurks at the centre of the Milky Way — highlighted here with a small circle. New research has revealed exciting evidence of interstellar gas and dust orbiting the black hole at high speeds.
The molecular-hydrogen-rich gas clouds which have been identified are known as molecular cloudlets, and they have never before been unambiguously detected. This image actually shows the distribution of molecules including carbon monoxide, the cloudlets’ second most abundant molecular component. The cloudlets lie 26 000 light-years away from us, orbiting fast and relatively close to the black hole, at a distance of about one light year. ALMA’s high resolution allowed scientists to detect the cloudlets, which are the products of pre-existing massive clouds rotating around the centre of our galaxy. These clouds were tidally disrupted into dense fragments and a lower density, short-lived component. The latter was identified thanks to the signs left by the passage of the synchrotron radiation emitted by Sagittarius A* through diffuse gas between the cloudlets. Although clouds of molecular gas have the potential to form new stars, these cloudlets are unlikely to create stellar newborns. They have a comparatively small mass of around 60 times that of the Sun, and exist close to the huge, turbulent, punishing gravitational forces exerted by Sagittarius A*. While the stars orbiting Sagittarius A* have been systematically observed, these dense molecular cloudlets have not been detected so close to the centre of our galaxy before. |
日期 | |
來源 | https://www.eso.org/public/images/potw1843a/ |
作者 | ALMA (ESO/NAOJ/NRAO)/ J. R. Goicoechea (Instituto de Física Fundamental, CSIC, Spain) |
授權條款
![]() |
This media was created by the European Southern Observatory (ESO).
Their website states: "Unless specifically noted, the images, videos, and music distributed on the public ESO website, along with the texts of press releases, announcements, pictures of the week, blog posts 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. |
![]() ![]() 此檔案採用創用CC 姓名標示 4.0 國際授權條款。
|
說明
在此檔案描寫的項目
描繪內容
22 10 2018
image/tiff
919,982 位元組
892 像素
806 像素
1
檔案歷史
點選日期/時間以檢視該時間的檔案版本。
日期/時間 | 縮圖 | 尺寸 | 使用者 | 備註 | |
---|---|---|---|---|---|
目前 | 2018年10月22日 (一) 10:44 | ![]() | 806 × 892(898 KB) | Jmencisom | User created page with UploadWizard |
檔案用途
下列頁面有用到此檔案:
全域檔案使用狀況
以下其他 wiki 使用了這個檔案:
- af.wikipedia.org 的使用狀況
- en.wikipedia.org 的使用狀況
詮釋資料
此檔案中包含其他資訊,這些資訊可能是由數位相機或掃描器在建立或數位化過程中所新增的。若檔案自原始狀態已被修改,一些詳細資料可能無法完整反映出已修改的檔案。
寬度 | 806 px |
---|---|
高度 | 892 px |
每像素位元 |
|
壓縮方式 | LZW |
像素合成 | RGB |
方位 | 標準 |
像素數量 | 3 |
每帶行數 | 108 |
水平解析度 | 72 dpi |
垂直解析度 | 72 dpi |
資料排列 | 矮胖格式 |
使用軟體 | Adobe Photoshop CC (Windows) |
檔案修改日期時間 | 2018年10月9日 (二) 09:07 |
色彩空間 | 顏色未校準 |
warning | identify: Incompatible type for "RichTIFFIPTC"; tag ignored. `TIFFFetchNormalTag' @ warning/tiff.c/TIFFWarnings/912. |