Image:Sig07-009.jpg
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[edit] Summary
This beautiful galaxy is tilted at an oblique angle on to our line of sight, giving a "birds-eye view" of the spiral structure. The galaxy is similar to our Milky Way, but our favorable view provides a better picture of the typical architecture of spiral galaxies.
M81 may be undergoing a surge of star formation along the spiral arms due to a close encounter it may have had with its nearby spiral galaxy NGC 3077 and a nearby starburst galaxy (M82) about 300 million years ago.
M81 is one of the brightest galaxies that can be seen from the Earth. It is high in the northern sky in the circumpolar constellation Ursa Major, the Great Bear. At an apparent magnitude of 6.8 it is just at the limit of naked-eye visibility. The galaxy's angular size is about the same as that of the Full Moon.
This image combines data from the Hubble Space Telescope, the Spitzer Space Telescope, and the Galaxy Evolution Explorer (GALEX) missions. The GALEX ultraviolet data were from the far-UV portion of the spectrum (135 to 175 nanometers). The Spitzer infrared data were taken with the IRAC 4 detector (8 microns). The Hubble data were taken at the blue portion of the spectrum.
[edit] File info
| Description |
Multiwavelength M81 |
|---|---|
| Source |
http://gallery.spitzer.caltech.edu/Imagegallery/image.php?image_name=sig07-009 |
| Date |
2007/05/30 |
| Author |
Hubble data: NASA, ESA, and A. Zezas (Harvard-Smithsonian Center for Astrophysics); GALEX data: NASA, JPL-Caltech, GALEX Team, J. Huchra et al. (Harvard-Smithsonian Center for Astrophysics); Spitzer data: NASA/JPL/Caltech/S. Willner (Harvard-Smithsonian Center for Astrophysics |
| Permission (Reusing this image) |
http://www.spitzer.caltech.edu/Media/mediaimages/copyright.shtml |
[edit] Individual images
see http://gallery.spitzer.caltech.edu/Imagegallery/image.php?image_name=sig07-009 High quality tif files also avaliable.
[edit] Licensing
 |
This file is in the public domain because it was created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (NASA copyright policy page or JPL Image Use Policy).
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File history
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| Date/Time | Dimensions | User | Comment | |
|---|---|---|---|---|
| current | 20:39, 11 July 2007 | 3,180×2,456 (5.94 MB) | Anzibanonzi | (==Summary== This beautiful galaxy is tilted at an oblique angle on to our line of sight, giving a "birds-eye view" of the spiral structure. The galaxy is similar to our Milky Way, but our favorable view provides a better picture of the typical architectur) |
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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.
| Width | 2456 |
|---|---|
| Height | 3180 |
| Compression scheme | 5 |
| Pixel composition | RGB |
| Orientation | Normal |
| Number of components | 3 |
| Horizontal resolution | 300 dpi |
| Vertical resolution | 300 dpi |
| Data arrangement | chunky format |
| Software used | Adobe Photoshop CS3 Macintosh |
| File change date and time | 11:31, 30 May 2007 |
| Color space | 65535 |
