The Outer Disks of Spiral Galaxies

  • Jonathan Braine
Part of the Astrophysics and Space Science Proceedings book series (ASSSP)

Molecular gas, via its CO emisssion, is detectable far out in the Milky Way, M33, NGC 4414, and probably all spirals with extended HI. Metallicity is not a great problem for CO detection in regions with a weak radiation field, such as outer disks. The association with HI and star formation is very good but not perfect –giant molecular clouds can be found in zones with little HI. In the outer Galaxy, there is no sharp decrease in CO line intensity despite the lack of obvious heating sources for outer galaxy clouds.


Star Formation Molecular Cloud Spiral Galaxy Magellanic Cloud Outer Disk 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  • Jonathan Braine
    • 1
  1. 1.Observatoire de BordeauxUniversité Bordeaux 1France

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