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DR 21 - 版本历史
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<p><b>新页面</b></p><div>{{Infobox nebula<br />
|name = DR 21<br />
|image = Stars in the DR21 Region (crop).jpg<br />
|caption = DR 21分子雲的紅外影像<br />
|type = 分子雲<br />
|subtype = [[發射星雲]]<br />
|epoch = [[J2000]]<br />
|ra = {{RA|20|39|01.6}}<br />
|dec = {{DEC|+42|19|38}}<br />
|dist_ly = 6,000<br />
|dist_pc = 1,800<br />
|constellation = [[天鵝座]]<br />
|names = {{nowrap|GRS G081.70 +00.50}}、{{nowrap|GAL 081.681+00.54}}、{{nowrap|W 75}}、{{nowrap|18P 78}}、{{nowrap|36P 19}}、 {{nowrap|[[RAFGL]] 2624}}<br />
}}<br />
<br />
'''DR 21'''是一個大[[分子雲]]<ref name="Nadeau1988">{{cite journal |title=Observations of the line profiles of H2 in the DR 21 molecular cloud |journal=The Astronomical Journal |first1=Daniel |last1=Nadeau |first2=Stephane |last2=Beland |volume=95 |pages=136–140 |date=January 1988 |doi=10.1086/114621 |bibcode=1988AJ.....95..136N|doi-access=free }}</ref>。它是唐斯（{{langx|en|Downes}}）和萊因哈特（{{langx|en|Rinehart}}）於1966年在[[星座]][[天鵝座]]發現的連續電波源<ref>{{cite journal |title=Microwave Observations of the Cygnus X Region |url=https://archive.org/details/sim_astrophysical-journal_1966-06_144_3/page/936 |journal=The Astrophysical Journal |first1=D. |last1=Downes |first2=R. |last2=Rinehart |volume=144 |page=937 |date=June 1966 |doi=10.1086/148691 |bibcode=1966ApJ...144..937D|doi-access=free }}</ref>。DR 21距地球大約{{convert|6000|ly|pc}}，延伸約{{convert|80|ly|pc}}<ref name="Rees2012">{{cite book |url=https://books.google.com/books?id=CqrWEBWPfYoC&pg=PA246 |title=Universe: The Definitive Visual Guide |publisher=[[Dorling Kindersley]] |location=New York |editor-first=Martin J. |editor-last=Rees |page=246 |date=October 2012 |isbn=978-0-7566-9841-6}}</ref>。這個區域有著高速率的[[恆星形成]]，並與[[天鵝座X (恆星複合體)|天鵝座X]]恆星形成區結合。估計它的質量約為{{solar mass|1,000,000|link=y}}<ref name="Wilson1990">{{cite journal |title=The Internal Structure of Molecular Clouds. I. C<sup>18</sup>O, C<sup>34</sup>S and NH<sub>3</sub> Maps of the DR 21/W 75 S Region |journal=Astronomy and Astrophysics |first1=T. L. |last1=Wilson |first2=R. |last2=Mauersberger |volume=239 |issue=1–2 |pages=305–318 |date=November 1990 |bibcode=1990A&A...239..305W}}</ref>。<br />
<br />
通過無線電發射在該區域檢測到許多不同的分子，包括[[甲醛]]、[[氨]]、[[水]] 和[[一氧化碳]]<ref>{{cite web |url=http://www.gb.nrao.edu/~glangsto/dr21/ |title=DR21: Star Forming Region in Constellation Cygnus |publisher=[[National Radio Astronomy Observatory]] |first=Glen |last=Langston |date=2001 |access-date=24 December 2015}}</ref>。<br />
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在這個地區，已經觀測到銀河系中一些質量最大的恆星。{{nowrap|DR 21}}包含複雜的塵埃和氣體結構，由於存在被稱為[[多環芳香烴]]的有機化合物，它們在 [[紅外線]]中發光。{{nowrap|DR 21}}是與[[星際風]]、[[輻射壓力]]、[[磁場]]和 [[引力]]相互作用的結果<ref name="Lai2003">{{cite journal |title=Interferometric Mapping of Magnetic Fields in Star-forming Regions. III. Dust and CO Polarization in DR 21(OH) |url=https://archive.org/details/sim_astrophysical-journal_2003-11-20_598_1/page/392 |journal=The Astrophysical Journal |first1=Shih-Ping |last1=Lai |first2=José M. |last2=Girart |first3=Richard M. |last3=Crutcher |volume=598 |issue=1 |pages=392–399 |date=November 2003 |arxiv=astro-ph/0308051 |bibcode=2003ApJ...598..392L |doi=10.1086/378769|s2cid=14746266 }}</ref>。<br />
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估計在這個分子雲中已經有2,900顆恆星形成，它們分佈在與雲團相關的群體中，類似於[[獵戶座星雲]]星團的種群<ref name="Kuhn2015">{{cite journal |title=The Spatial Structure of Young Stellar Clusters. II. Total Young Stellar Populations |journal=The Astrophysical Journal |first1=Michael A. |last1=Kuhn |first2=Konstantin V. |last2=Getman |first3=Eric D. |last3=Feigelson |volume=802 |issue=1 |at=60 |date=March 2015 |arxiv=1501.05300 |bibcode=2015ApJ...802...60K |doi=10.1088/0004-637X/802/1/60|s2cid=119309858 }}</ref>。來自大質量恆星的反饋最終可能會破壞星雲，但由於該地區極端年輕，這還沒有發生。史匹哲太空望遠鏡對這些恆星的研究顯示出仍有原行星盤的跡象<ref name="Povich2013">{{cite journal |title=The MYStIX Infrared-Excess Source Catalog |journal=The Astrophysical Journal Supplement |first1=Matthew S. |last1=Povich |first2=Michael A. |last2=Kuhn |first3=Konstantin V. |last3=Getman |first4=Heather A. |last4=Busk |first5=Eric D. |last5=Feigelson |first6=Patrick S. |last6=Broos |first7=Leisa K. |last7=Townsley |first8=Robert R. |last8=King |first9=Tim |last9=Naylor |display-authors=5 |volume=209 |issue=2 |at=31 |date=December 2013 |arxiv=1309.4497 |bibcode=2013ApJS..209...31P |doi=10.1088/0067-0049/209/2/31|s2cid=62807763 }}</ref>。<br />
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== 參考文獻 ==<br />
{{reflist}}<br />
<br />
== 外部連結 ==<br />
{{commons category-inline|DR 21}}<br />
* [http://simbad.u-strasbg.fr/simbad/sim-id?Ident=DR+21 DR 21] at [[SIMBAD]]<br />
* [http://www.spitzer.caltech.edu/news/161-ssc2004-06-Invisible-Giants-Exposed-in-New-Spitzer-Image "Invisible Giants Exposed in New Spitzer Image"] by NASA/Jet Propulsion Laboratory<br />
* [http://photojournal.jpl.nasa.gov/catalog/PIA05736 "Star Formation in the DR21 Region (B)"] by NASA/Jet Propulsion Laboratory<br />
* {{APOD |date=14 April 2004 |title=Massive Star Forming Region DR21 in Infrared}}<br />
{{天鵝座恆星}}<br />
[[Category:分子雲]]<br />
[[Category:發射星雲]]<br />
[[Category:天鵝座]]<br />
[[Category:恆星形成區]]</div>
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