World Library  
Flag as Inappropriate
Email this Article

Super star cluster

Article Id: WHEBN0006115906
Reproduction Date:

Title: Super star cluster  
Author: World Heritage Encyclopedia
Language: English
Subject: Globular cluster, Star, Westerlund 2, NGC 4214, NGC 7252
Collection:
Publisher: World Heritage Encyclopedia
Publication
Date:
 

Super star cluster

A super star cluster (SSC) is a very massive young open cluster that is thought to be the precursor of a globular cluster.[1] They typically contain a very large number of young, massive stars that ionize a surrounding H II region, similar to our Milky Way's so-called "Ultra dense H II regions (UDHIIs)".[2] An SSC's H II region is in turn surrounded by a cocoon of dust. In many cases, the stars and the H II regions will be invisible to optical observations due to high levels of extinction. As a result, the youngest SSCs are best observed in radio and infrared.[3]

The unique characteristics of SSCs are their large electron densities n_e=10^310^6 cm^{-3} and pressures P/k_b=10^710^{10} K cm^{-3}.[3]

List

Name Galaxy Comments Notes
Westerlund 1 (Wd1) Milky Way Galaxy First SSC discovered in our galaxy. [4]
NGC 3603 Milky Way Galaxy [5]
R136 Large Magellanic Cloud (LMC) The prototype SSC [6]
NGC 1569 Galaxy contains two SSCs [7]

References

  1. ^
  2. ^
  3. ^ a b
  4. ^
  5. ^
  6. ^
  7. ^

External links

  • Monster Super Star Cluster Discovered In Milky Way


This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and USA.gov, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for USA.gov and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
 
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
 
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.
 


Copyright © World Library Foundation. All rights reserved. eBooks from Project Gutenberg are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.