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File:Milky Way Arms.svg

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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. H II 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:

  1. small - U > 200 pc cm-2
  2. medium - 200 > U > 110 pc cm-2
  3. large - 110 > U > 70 pc cm-2
Date (UTC)
Source A redevelopment of Image:Milky Way Arms-Hypothetical.png: details about method below.
User:YUL89YYZ, User:Ctachme, Kevin Krisciunas, Bill Yenne: "The Pictorial Atlas of the Universe", page 145 (ISBN 1-85422-025-X) and µOR.
Author User:Rursus
Other versions

Derivative works of this file: Milky Way Arms.png

This SVG file contains embedded text that can be translated into your language, using an SVG supportive editor (like XML or text). For more information see: About translating SVG files.


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


  1. a b Momany, Zaggia, Gilmore, Piotto, Carraro, Bedin, Angeli, A&A press release, Released on March 16th, 2006, Last retrieved: 9 jun 2007
  2. Outer Disk Ring?, review of a letter to New Scientist from Naomi McClure-Griffiths et al. (Both latest retrieved 9 Jun 2007)
  3. - Jenny Hogan: Milky Way spiral gets an extra arm, last retrieved 9 jun 2007


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File history

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current19:21, 9 June 2007Thumbnail for version as of 19:21, 9 June 2007614 × 580 (186 KB)Rursus
19:07, 9 June 2007Thumbnail for version as of 19:07, 9 June 2007614 × 580 (186 KB)Rursus
12:58, 9 June 2007Thumbnail for version as of 12:58, 9 June 2007592 × 580 (183 KB)Rursus
12:25, 9 June 2007Thumbnail for version as of 12:25, 9 June 2007592 × 580 (170 KB)Rursus
10:32, 9 June 2007Thumbnail for version as of 10:32, 9 June 2007592 × 580 (201 KB)Rursus
08:58, 9 June 2007Thumbnail for version as of 08:58, 9 June 2007592 × 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=~~~~~
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