File:Milky Way Arms.svg

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Milky_Way_Arms.svg‎ (SVG file, nominally 614 × 580 pixels, file size: 186 KB)

[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

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[edit] Summary

Description

A redevelopment of Image:Milky Way Arms-Hypothetical.png: details about method below.

Date

08:58, 9 June 2007 (UTC)

Source

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

Permission
(Reusing this image)

See below.

Other versions

Original concept

German description

[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

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled "GNU Free Documentation License".

This file is licensed under the Creative Commons Attribution ShareAlike 3.0 License. In short: you are free to share and make derivative works of the file under the conditions that you appropriately attribute it, and that you distribute it only under a license identical to this one. Official license

This licensing tag was added to this file as part of the GFDL licensing update.

File history

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

	Date/Time	Thumbnail	Dimensions	User	Comment
current	19:21, 9 June 2007		614×580 (186 KB)	Rursus (Talk \| contribs)
	19:07, 9 June 2007		614×580 (186 KB)	Rursus (Talk \| contribs)
	12:58, 9 June 2007		592×580 (183 KB)	Rursus (Talk \| contribs)
	12:25, 9 June 2007		592×580 (170 KB)	Rursus (Talk \| contribs)
	10:32, 9 June 2007		592×580 (201 KB)	Rursus (Talk \| contribs)
	08:58, 9 June 2007		592×580 (237 KB)	Rursus (Talk \| contribs)	({{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=~~~~~ )