en>Cydebot: Robot - Speedily moving category Polarization to :Category:Polarization (waves) per CFDS.

2013-08-28T03:52:52Z

Robot - Speedily moving category Polarization to Category:Polarization (waves) per CFDS.

← Older revision		Revision as of 05:52, 28 August 2013
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	~~Hello and welcome~~. My title ~~is Numbers Wunder~~. ~~South Dakota is exactly where me and my spouse live~~. ~~To do aerobics is~~ a ~~thing~~ that I'~~m completely addicted~~ to. ~~Bookkeeping is her day occupation now~~.<br><br>~~Here is my site~~ - [http://www.~~adosphere~~.~~com~~/~~member~~/~~28512~~/~~blog~~/~~view~~/~~66112~~/ www.~~adosphere~~.com]		A '''super star cluster''' ('''SSC''') is a very large region that is thought to be the precursor of a [[globular cluster]].<ref name=gallagher02>{{cite journal
			\| author = Gallagher & Grebel
			\| year = 2002
			\| title = Extragalactic Star Clusters: Speculations on the Future
			\| journal = Extragalactic Star Clusters, IAU Symposium
			\| pages = 207
			\| bibcode = 2002IAUS..207..745G
			\|arxiv = astro-ph/0109052 }}</ref> They typically contain a very large number of [[T Tauri Star\|young]], [[OB star\|massive stars]] that ionize a surrounding [[H II region]], similar to our [[Milky Way Galaxy\|Milky Way]]'s so-called "Ultra dense H II regions (UDHIIs)".<ref name=kobulnicky99>{{cite journal
			\| author = Kobulnicky & Johnson
			\| year = 1999
			\| title = Signatures of the Youngest Starbursts: Optically Thick Thermal Bremsstrahlung Radio Sources in Henize 2-10
			\| journal = ApJ
			\| pages = 154–166
			\| issue = 1
			\| volume = 527
			\| bibcode = 1999ApJ...527..154K
			\| doi = 10.1086/308075
			\| last2 = Johnson
			\| first2 = Kelsey E.
			\|arxiv = astro-ph/9907233 }}</ref> An SSC's [[H II region]] is in turn surrounded by a cocoon of [[cosmic dust\|dust]]. In many cases, the stars and the H II regions will be invisible to optical observations due to high levels of [[extinction (astronomy)\|extinction]]. As a result, the youngest SSCs are best observed in [[radio astronomy\|radio]] and [[infrared astronomy\|infrared]].<ref name=johnson04>{{cite journal
			\| author = Johnson
			\| year = 2004
			\| title = Extragalactic Ultracompact HII Regions: Probing the Birth Environments of Super Star Clusters
			\| journal = Astronomical Society of the Pacific Conference Series
			\| pages = 322
			\| volume = 527
			\| bibcode = 2004ASPC..322..339J
			\|arxiv = astro-ph/0405125 }}</ref>

			The unique characteristics of SSCs are their large [[electron]] [[Density\|densities]] <math>n_e=10^3</math>–<math>10^6</math> cm<math>^{-3}</math> and [[pressure]]s <math>P/</math>[[Boltzmann's constant\|<math>k_b</math>]]<math>=10^7</math>–<math>10^{10}</math> [[Kelvin\|K]] cm<math>^{-3}</math>.<ref name=johnson04/>

			While there are many examples of SSCs in other galaxies, [[Westerlund 1]] may be the only cluster in the [[Milky Way]] deserving of the title.<ref>{{cite news \| date=March 22, 2005 \| title=Young and Exotic Stellar Zoo: ESO's Telescopes Uncover Super Star Cluster in the Milky Way \| publisher=ESO \| url=http://www.eso.org/outreach/press-rel/pr-2005/pr-08-05.html \| accessdate=2007-03-20 }}</ref>

			==List==
			{\|class=wikitable
			\|-
			! Name
			! Galaxy
			! Comments
			! Notes
			\|-
			\| [[Westerlund 1]] (Wd1)
			\| [[Milky Way Galaxy]]
			\| First SSC discovered in our galaxy.
			\| <ref>Astronomy and Astrophysics, "On the massive stellar population of the super star cluster Westerlund 1", '''Clark, J. S.; Negueruela, I.; Crowther, P. A.; Goodwin, S. P.''', ''Volume 434, Issue 3, May II 2005, pp.949-969'', {{doi\|10.1051/0004-6361:20042413}} , {{bibcode\|2005A&A...434..949C}} , {{arxiv\|astro-ph/0504342v2}}</ref>
			\|-
			\| [[R136]]
			\| [[Large Magellanic Cloud]] (LMC)
			\| The prototype SSC
			\| <ref>Astrophysical Journal, "Star Formation in R136: A Cluster of O3 Stars Revealed by Hubble Space Telescope Spectroscopy", '''Massey, Philip; Hunter, Deidre A.''', ''01/1998, v.493, p.180'', {{doi\|10.1086/305126}} , {{bibcode\|1998ApJ...493..180M}}</ref>
			\|-
			\|
			\| [[NGC 1569]]
			\| Galaxy contains two SSCs
			\| <ref>"The Star Clusters in the Starburst Irregular Galaxy NGC 1569" http://adsabs.harvard.edu/abs/2000AJ....120.2383H</ref>
			\|}

			{{listdev\|date=February 2011}}

			==See also==
			* [[Open cluster]]
			* [[Globular cluster]]

			==References==
			{{Reflist}}

			==External links==
			*[http://www.sciencedaily.com/releases/2005/05/050528143304.htm Monster Super Star Cluster Discovered In Milky Way]

			[[Category:Star clusters]]
			[[Category:Super star clusters\| ]]

			{{astronomy-stub}}
			{{star-cluster-stub}}

67.171.235.22: /* Polarization modulation of a light source */

2012-02-23T04:52:04Z

Polarization modulation of a light source

New page

Hello and welcome. My title is Numbers Wunder. South Dakota is exactly where me and my spouse live. To do aerobics is a thing that I'm completely addicted to. Bookkeeping is her day occupation now.<br><br>Here is my site - [http://www.adosphere.com/member/28512/blog/view/66112/ www.adosphere.com]

Photoelastic modulator - Revision history

en>Cydebot: Robot - Speedily moving category Polarization to :Category:Polarization (waves) per CFDS.

67.171.235.22: /* Polarization modulation of a light source */