Jump to content

File:NGC-4555.jpg

Page contents not supported in other languages.
This is a file from the Wikimedia Commons
From Wikipedia, the free encyclopedia

NGC-4555.jpg (576 × 463 pixels, file size: 176 KB, MIME type: image/jpeg)

Summary

X-ray/Optical Composite of NGC 4555

Dark matter continues to confound astronomers, as NASA's Chandra X-ray Observatory demonstrated with the detection of an extensive envelope of dark matter around an isolated elliptical galaxy. This discovery conflicts with optical data that suggest a dearth of dark matter around similar galaxies, and raises questions about how galaxies acquire and keep such dark matter halos. (Description from http://chandra.harvard.edu/photo/2004/ngc4555/more.html#ngc4555_comp)

Scale: Image is 8 x 6.5 arcmin per side.

http://chandra.harvard.edu/photo/2004/ngc4555/more.html#ngc4555_comp

(Credit: X-ray: NASA/CXC/E.O'Sullivan et al.; Optical: Palomar DSS)

Licensing

Public domain This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.)
Warnings:

Captions

Add a one-line explanation of what this file represents

Items portrayed in this file

depicts

File history

Click on a date/time to view the file as it appeared at that time.

Date/TimeThumbnailDimensionsUserComment
current07:32, 15 November 2010Thumbnail for version as of 07:32, 15 November 2010576 × 463 (176 KB)GarrondoHigher quality. Adequate source
01:38, 21 June 2007Thumbnail for version as of 01:38, 21 June 2007324 × 271 (54 KB)RedAndrNGC 4555 galaxy http://rst.gsfc.nasa.gov/Sect20/ngc4555.jpg

The following page uses this file:

Global file usage

The following other wikis use this file:

Metadata

This file contains additional information, probably added from the digital camera or scanner used to create or digitize it.

If the file has been modified from its original state, some details may not fully reflect the modified file.

Retrieved from "https://en.wikipedia.org/wiki/File:NGC-4555.jpg"