File:Potw1238a.tif
原始檔案 （2,796 × 2,388 像素，檔案大小：14.56 MB，MIME 類型：image/tiff）
Source: http://www.spacetelescope.org/images/potw1238a/ (direct link)
摘要
The NASA/ESA Hubble Space Telescope has produced a sharp image of NGC 4634, a spiral galaxy seen exactly side-on. Its disc is slightly warped by ongoing interactions with a nearby galaxy, and it is crisscrossed by clearly defined dust lanes and bright nebulae.
NGC 4634, which lies around 70 million light-years from Earth in the constellation of Coma Berenices, is one of a pair of interacting galaxies. Its neighbour, NGC 4633, lies just outside the upper right corner of the frame, and is visible in wide-field views of the galaxy. While it may be out of sight, it is not out of mind: its subtle effects on NGC 4634 are easy to see to a well-trained eye.
Gravitational interactions pull the neat spiral forms of galaxies out of shape as they get closer to each other, and the disruption to gas clouds triggers vigorous episodes of star formation. While this galaxy’s spiral pattern is not directly visible thanks to our side-on perspective, its disc is slightly warped, and there is clear evidence of star formation.
Along the full length of the galaxy, and scattered around parts of its halo, are bright pink nebulae. Similar to the Orion Nebula in the Milky Way, these are clouds of gas that are gradually coalescing into stars. The powerful radiation from the stars excites the gas and makes it light up, much like a fluorescent sign. The large number of these star formation regions is a telltale sign of gravitational interaction.
The dark filamentary structures that are scattered along the length of the galaxy are caused by cold interstellar dust blocking some of the starlight.
Hubble’s image is a combination of exposures in visible light produced by Hubble’s Advanced Camera for Surveys and the Wide Field and Planetary Camera 2.
Credit:
ESA/Hubble & NASA
About the Image Id: potw1238a Type: Observation Release date: 17 September 2012, 10:00 Size: 2796 x 2388 px About the Object Name: NGC 4634 Type: • Local Universe : Galaxy : Type : Spiral • Galaxies Images/Videos Distance: 70 million light years
Colours & filters Band Wavelength Telescope Optical H-alpha 658 nm Hubble Space Telescope ACS Optical R+H-alpha Hubble Space Telescope ACS Optical R 625 nm Hubble Space Telescope ACS Optical V 606 nm Hubble Space Telescope WFPC2Optical B 450 nm Hubble Space Telescope WFPC2
授權條款
License: http://www.spacetelescope.org/copyright/
- 您可以自由：
- 分享 – 複製、發佈和傳播本作品
- 重新修改 – 創作演繹作品
- 惟需遵照下列條件：
- 姓名標示 – 您必須指名出正確的製作者，和提供授權條款的連結，以及表示是否有對內容上做出變更。您可以用任何合理的方式來行動，但不得以任何方式表明授權條款是對您許可或是由您所使用。
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 | 用戶 | 備註 | |
|---|---|---|---|---|---|
| 目前 | 2012年9月23日 (日) 14:07 |  | 2,796 × 2,388（14.56 MB） | Fabian RRRR | '''Source:''' http://www.spacetelescope.org/images/potw1238a/ ([http://www.spacetelescope.org/static/archives/images/original/potw1238a.tif direct link]) == {{int:filedesc}} == {{en| Glowing gas and dark dust in a side-on spiral Glowing gas and dark d... |
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：