跳转到内容

File:NGC 4861 - HST- Potw1704a.tif

页面内容不支持其他语言。
这个文件来自维基共享资源
维基百科，自由的百科全书

原始文件 （3,885 × 3,107像素，文件大小：69.11 MB，MIME类型：image/tiff）

摘要

描述
English: The lesser-known constellation of Canes Venatici (The Hunting Dogs), is home to a variety of deep-sky objects — including this beautiful galaxy, known as NGC 4861. Astronomers are still debating on how to classify it: While its physical properties — such as mass, size and rotational velocity — indicate it to be a spiral galaxy, its appearance looks more like a comet with its dense, luminous “head” and dimmer “tail” trailing behind. Features more fitting with a dwarf irregular galaxy.

Although small and messy, galaxies like NGC 4861 provide astronomers with interesting opportunities for study. Small galaxies have lower gravitational potentials, which simply means that it takes less energy to move stuff about inside them than it does in other galaxies. As a result, moving in, around, and through such a tiny galaxy is quite easy to do, making them far more likely to be suffused with streams and outflows of speedy charged particles known as galactic winds, which can flood such galaxies with little effort.

These galactic winds can be powered by the ongoing process of star formation, which involves huge amounts of energy. New stars are springing into life within the bright, colourful ‘head’ of NGC 4861 and ejecting streams of high-speed particles as they do so, which flood outwards to join the wider galactic wind. While NGC 4861 would be a perfect candidate to study such winds, recent studies did not find any galactic winds in it.

Credit:

ESA/Hubble & NASA 

Coordinates
Position (RA): 	12 59 2.76
Position (Dec):	34° 51' 46.80"
Field of view: 	3.24 x 2.59 arcminutes
Orientation:   	North is 80.3° right of vertical

Colours & filters Band	Wavelength	Telescope
Optical V	606 nm	Hubble Space Telescope ACS
Optical V	606 nm	Hubble Space Telescope ACS
Optical I	814 nm	Hubble Space Telescope ACS
Optical NII	658 nm	Hubble Space Telescope WFC3
Optical SII	673 nm	Hubble Space Telescope WFC3
Optical I	814 nm	Hubble Space Telescope ACS
.
日期
来源 http://spacetelescope.org/images/potw1704a/ http://spacetelescope.org/static/archives/images/original/potw1704a.tif
作者 Credit: ESA/Hubble & NASA

许可协议

w:zh:知识共享
署名
署名
 ESA/Hubble images, videos and web texts are released by the ESA under the Creative Commons Attribution 4.0 International license and may on a non-exclusive basis be reproduced without fee provided they are clearly and visibly credited. Detailed conditions are below; see the ESA copyright statement for full information. For images created by NASA or on the hubblesite.org website, or for ESA/Hubble images on the esahubble.org site before 2009, use the {{PD-Hubble}} tag.
Conditions:
  • The full image or footage credit must be presented in a clear and readable manner to all users, with the wording unaltered (for example: "ESA/Hubble"). Web texts should be credited to ESA/Hubble (except when used by media). The credit should not be hidden or disassociated from the image footage. Links should be active if the credit is online. See the usage rights Q&A section on the ESA copyright page for guidance.
  • ESA/Hubble materials may not be used to state or imply the endorsement by ESA/Hubble or any ESA/Hubble employee of a commercial product or service.
  • ESA/Hubble requests a copy of the product sent to them to be indexed in their archive.
  • If an image shows an identifiable person, using that image for commercial purposes may infringe that person's right of privacy, and separate permission should be obtained from the individual.
  • If images or visuals are changed significantly from the original work (apart from resizing, cropping), we suggest that the changes are mentioned after the credit line. For example "Original image by ESA/Hubble (M. Kornmesser), warping and recolouring by NN".

Notes:

  • Note that this general permission does not extend to the use of ESA/Hubble's logo, which shall remain protected and may not be used or reproduced without prior and individual written consent of ESA/Hubble.
  • Also note that music, scientific papers and code on the esahubble.org site are not released under this license and can not be used for non-ESA/Hubble products.
  • By reproducing ESA/Hubble material, in part or in full, the user acknowledges the terms on which such use is permitted.
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。
署名: ESA/Hubble
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

描绘内容

版权状态 简体中文（已转写）

版权所有 简体中文（已转写）

许可协议

知识共享署名4.0国际 简体中文（已转写）

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2017年1月23日 (一) 11:362017年1月23日 (一) 11:36版本的缩略图3,885 × 3,107（69.11 MB）Fabian RRRR=={{int:filedesc}}== {{Information |description={{en|1=The lesser-known constellation of Canes Venatici (The Hunting Dogs), is home to a variety of deep-sky objects — including this beautiful galaxy, known as NGC 4861. Astronomers are still debating...

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:NGC_4861_-_HST-_Potw1704a.tif”