File:NGC 4625 and NGC 4618 in UV.jpg
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Summary[edit]
DescriptionNGC 4625 and NGC 4618 in UV.jpg |
English: Look at My Arms!
This image shows the hidden spiral arms that were discovered around the galaxy called NGC 4625 (top) by the ultraviolet eyes of NASA's Galaxy Evolution Explorer. An armless companion galaxy called NGC 4618 is pictured below. Though the lengthy spiral arms are nearly invisible when viewed in optical light, they glow brightly in ultraviolet. This is because they are bustling with hot, newborn stars that radiate primarily ultraviolet light. The youthful arms are also very long, stretching out to a distance four times the size of the galaxy's core. They are part of the largest ultraviolet galactic disk discovered so far. Located 31 million light-years away in the constellation Canes Venatici, NGC 4625 is the closest galaxy ever seen with such a young halo of arms. It is slightly smaller than our Milky Way, both in size and mass. However, the fact that this galaxy's disk is forming stars very actively suggests that it might evolve into a more massive and mature galaxy resembling our own. Astronomers do not know why NGC 4618 lacks arms but speculate that it may have triggered the development of arms in NGC 4625. |
Date | |
Source | http://www.galex.caltech.edu/media/glx2005-04r_img03.html |
Author | NASA/JPL-Caltech/Carnegie Observatories |
Licensing[edit]
Public domainPublic domainfalsefalse |
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.) | ||
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current | 16:28, 30 June 2011 | 872 × 872 (867 KB) | Spitzersteph (talk | contribs) |
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Width | 872 px |
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Height | 872 px |
Compression scheme | LZW |
Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 72 dpi |
Vertical resolution | 72 dpi |
Data arrangement | chunky format |
Software used | Adobe Photoshop CS3 Macintosh |
File change date and time | 15:35, 3 March 2008 |
Color space | Uncalibrated |