Image:Milky Way Arms.svg
From Wikipedia, the free encyclopedia
Milky_Way_Arms.svg (SVG file, nominally 614 × 580 pixels, file size: 186 KB)
| This is a file from the Wikimedia Commons. The description on its description page there is shown below.
|
Contents |
[edit] Description
A "God's view" map of Milky Way as seen from far Galactic North (in Coma Berenices). The star-like lines center in a yellow dot representing the position of Sun. The spokes of that "star" are marked with constellation abbreviations, "Cas" for "Cassiopeia", etc. The spiral arms are colored differently in order to highlight what structure belongs to which arm. HII regions are marked as dots colored in the same color as their spiral arm. They come in three sizes, measured by the excitation parameter U:
- small - U > 200 pc cm-2
- medium - 200 > U > 110 pc cm-2
- large - 110 > U > 70 pc cm-2
[edit] Summary
| Description |
A redevelopment of Image:Milky Way Arms-Hypothetical.png: details about method below. |
|
|---|---|---|
| Source |
User:YUL89YYZ, User:Ctachme, Kevin Krisciunas, Bill Yenne: "The Pictorial Atlas of the Universe", page 145 (ISBN 1-85422-025-X) and µOR. |
|
| Date |
08:58, 9 June 2007 (UTC) |
|
| Author | ||
| Permission (Reusing this image) |
see below |
|
| Other versions |
|
[edit] Method
The original image, Image:Milky Way Arms-Hypothetical.png, was dloaded and rotated by gimp, so that Sun is up, as is custom on Milky Way "God's view" maps. The image is then saved and imported into inkscape, and used as a template for vector editing by hand. Thereafter added:
| a. | 30° sectors around Sun, named for constellation in that direction in the galactic plane, | dbl check! |
|---|---|---|
| b. | names for MW arms as per YUL89YYZ/Ctachme | Checked with [1][2][3] |
| c. | HII-regions registered by radio and optical, as per Krisciunas/Yenne, | secondary sources |
| d. | center of galaxy and galaxy bar, | Checked with [1] |
| e. | intensity maxima of arms, as per Krisciunas/Yenne | secondary sources |
[edit] References
- ↑ a b Momany, Zaggia, Gilmore, Piotto, Carraro, Bedin, Angeli, A&A press release, Released on March 16th, 2006, Last retrieved: 9 jun 2007
- ↑ Solstation.com: Outer Disk Ring?, review of a letter to New Scientist from Naomi McClure-Griffiths et al. (Both latest retrieved 9 Jun 2007)
- ↑ newscientist.com - Jenny Hogan: Milky Way spiral gets an extra arm, last retrieved 9 jun 2007
[edit] Licensing
File history
Click on a date/time to view the file as it appeared at that time.
| Date/Time | Dimensions | User | Comment | |
|---|---|---|---|---|
| current | 19:21, 9 June 2007 | 614×580 (186 KB) | Rursus | |
| 19:07, 9 June 2007 | 614×580 (186 KB) | Rursus | ||
| 12:58, 9 June 2007 | 592×580 (183 KB) | Rursus | ||
| 12:25, 9 June 2007 | 592×580 (170 KB) | Rursus | ||
| 10:32, 9 June 2007 | 592×580 (201 KB) | Rursus | ||
| 08:58, 9 June 2007 | 592×580 (237 KB) | Rursus | ({{Information |Description=A redevelopment of Image:Milky Way Arms-Hypothetical.png |Source=User:YUL89YYZ, User:Ctachme, Kevin Krisciunas, Bill Yenne: "The Pictorial Atlas of the Universe", page 145 (ISBN 1-85422-025-X) and µOR. |Date=~~~~~ ) |
