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NGC 3631 - 版本历史
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<p><b>新页面</b></p><div>{{Infobox galaxy<br />
| name = [[New General Catalogue|NGC]] 3631<br />
| image =Hubble Looks at a Face-On Grand Spiral.jpg<br />
| caption = NGC 3631 imaged by the [[Hubble Space Telescope]]<br />
| constellation name = [[大熊座]]<br />
| epoch = [[J2000]]<br />
| type = SA(s)c <ref name="ned">{{cite web<br />
| title=NASA/IPAC Extragalactic Database<br />
| work=Results for NGC 3631<br />
| url=http://ned.ipac.caltech.edu/cgi-bin/nph-objsearch?objname=NGC+3631<br />
| access-date=2016-01-18 }}</ref><br />
| ra = {{RA|11|21|02.8753}}<ref name="ned" /><br />
| dec = {{DEC|+53|10|11.038}}<ref name="ned" /><br />
| dist_ly = 33.7 ± 17.7 [[光年|Mly]] (10.3 ± 5.4 [[parsec|Mpc]])<ref name="ned" /><br />
| z = 0.003839<ref name="ned" /><br />
| h_radial_v = 1151 ± 1 km/s<ref name="ned" /><br />
| appmag_v = 10.1<br />
| size = ~{{convert|17.39|kpc|ly|abbr=on|lk=on|order=flip}}（估計）<ref name ="ned" /><br />
| size_v = {{Val|5.0|×|4.8|u=arcminute}}<ref name="ned" /><br />
| notes = <br />
| names = {{odlist | UGC= 6360 | Arp= 27 |MCG= +09-19-047 | VV= 363 | PGC= 34767}}<ref name="ned" /><br />
}}<br />
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'''NGC 3631'''是位於[[大熊座]]的一個[[螺旋星系]]。NGC 3631距離[[地球]]約3500萬[[光年]]，根據其視尺寸，意味著NGC 3631的直徑約為60,000光年。<br />
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威廉·赫歇爾於1789年4月14日發現NGC 3631<ref>[http://cseligman.com/text/atlas/ngc36.htm#3631 NGC 3631] cseligman.com</ref>。從正面看，這是一個[[宏觀螺旋星系]]。<br />
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==物理性質==<br />
NGC 3631是一個宏偉螺旋星系，具有兩個主要螺旋臂，始於中心附近。兩個主臂分支成表面亮度較低的次臂。該星系顯示出中等到高恆星形成率，並且所有旋臂中都存在明亮的HII區。NGC 3631的[[恆星]]形成率為每年4.6{{solar mass}}<ref>{{cite journal|last1=Mineo|first1=S.|last2=Gilfanov|first2=M.|last3=Lehmer|first3=B. D.|last4=Morrison|first4=G. E.|last5=Sunyaev|first5=R.|title=X-ray emission from star-forming galaxies – III. Calibration of the LX-SFR relation up to redshift z ≈ 1.3|journal=Monthly Notices of the Royal Astronomical Society|date=11 January 2014|volume=437|issue=2|pages=1698–1707|doi=10.1093/mnras/stt1999|doi-access=free |arxiv=1207.2157|bibcode=2014MNRAS.437.1698M|s2cid=119190124}}</ref>。[[赫頓·阿普]]觀察到NGC 3631的“直臂”和“從南臂內到外的吸收管”，並將該星系添加到他的《[[特殊星系圖集]]》中<ref name=Fridman2001>{{cite journal|last1=Fridman|first1=A. M.|last2=Khoruzhii|first2=O. V.|last3=Polyachenko|first3=E. V.|last4=Zasov|first4=A. V.|last5=Sil'Chenko|first5=O. K.|last6=Moiseev|first6=A. V.|last7=Burlak|first7=A. N.|last8=Afanasiev|first8=V. L.|last9=Dodonov|first9=S. N.|last10=Knapen|first10=J. H.|title=Gas motions in the plane of the spiral galaxy NGC 3631|url=https://archive.org/details/sim_monthly-notices-of-the-royal-astronomical-society_2001-05-21_323_3/page/650|journal=Monthly Notices of the Royal Astronomical Society|date=21 May 2001|volume=323|issue=3|pages=651–662|doi=10.1046/j.1365-8711.2001.04218.x|doi-access=free |arxiv=astro-ph/0012116|bibcode=2001MNRAS.323..651F|s2cid=119517678 }}</ref>。NGC 3631傾角為17度，對於地球而言幾乎可以正面觀看。<br />
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==參考資料==<br />
{{reflist}}<br />
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{{Catalogs|NGC=3631}} <br />
{{Ngc40}}<br />
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[[Category:大熊座]]<br />
[[Category:NGC天體|3631]]</div>
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