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{{Infobox Galaxy
| name = [[New General Catalogue|NGC]] 4261
| image = NGC 4261 X-ray.png
| image_size = 300px
| caption = An [[X-ray]] image of NGC 4261.
| credit =
| epoch = [[J2000]]
| constellation name = [[室女座]]
| ra = {{RA|12|19|23.21606}}<ref name=Truebenbach2017/>
| dec = {{DEC|+05|49|29.7000}}<ref name=Truebenbach2017/>
| z = 0.007465<ref name=ned/>
| h_radial_v = {{val|2238|7|u=km/s|fmt=commas}}<ref name=ned/>
| dist_ly = {{convert|29.4|±|2.6|Mpc|Mly|order=flip|abbr=on|lk=on}}<ref name="jensenetal2003"/>
| group_cluster = NGC 4261星系群, 室女座星系團
| type = E2<ref name=vanDenBergh2002/>
| appmag_v = 12.87<ref name=Véron-Cetty2010/>
| appmag_b = 13.92<ref name=Véron-Cetty2010/>
| absmag_v =
| size_v = {{nowrap|4′.17 × 3′.39}}<ref name=Paturel2003/>
| mass = 
| mass_light_ratio = 
| size = 
| notes =
| names = [[New General Catalogue|NGC]] 4261, [[Uppsala General Catalogue|UGC]] 7360,<ref name=SIMBAD/> [[Principal Galaxies Catalogue|PGC]] 39659<ref name="ned" />
}}
'''NGC 4261'''是一個[[橢圓星系]]<ref name="Davis1995" />，位於[[室女座]]，距離[[地球]]約1億[[光年]]<ref name="STScI-1997-01" />。1784年4月13日，NGC 4261由德國出生的[[天文學家]][[威廉·赫歇爾]]發現<ref name=cseligman/>。NGC 4261是NGC 4261星系群的成員<ref name=Davis1995/>，該星系群是[[室女座星系團]]的一部分。

NGC 4261形態分類為E2，為長軸與短軸之比為5:4的橢圓星系<ref name=vanDenBergh2002/>。NGC 4261星系的恆星族群很古老，沒有任何跡象表明最近有合併或與其族群其他成員相互作用的跡象。星系的大尺度等通常呈四方形，沒有任何標記表明過去十億年內發生了破壞性的相互作用。沿著星系的南北軸有一條塵埃帶，核心周圍有一個塵埃盤。

天文學家在無線電波段可以觀察到NGC 4261從核心發射出的兩個突出的噴流。NGC 4261有一個活躍的星系核，其中有一個稍微偏離核心中心的超大質量[[黑洞]]<ref name="STScI-1995-47"/>。黑洞的質量估計為{{val|1.62|0.04|e=9|ul=solar mass}}<ref name=Ruffa/> 。據估計，該星系的寬度約為6萬光年，從該星系噴出的噴流估計橫跨約8.8萬光年<ref name="astro162"/>。

2001年1月1日，NGC 4261星系發現Ia 型超新星<ref name=vanDenBergh2002/>，位置為銀核以西3.1″、以北10.7″。2000年12月15日，超新星亮度達18.4等<ref name=Modjaz2001/>。

==參考資料==
{{reflist|refs=

<ref name=SIMBAD>{{cite simbad
| title=NGC 4261 | access-date=2020-09-18 }}</ref>

<ref name=cseligman>{{cite web
| url=https://cseligman.com/text/atlas/ngc42a.htm#4261
| title=New General Catalogue objects: NGC 4250 - 4299
| last=Seligman
| first=Courtney
| website=cseligman.com
| access-date=2020-09-19
| archive-date=2018-10-23
| archive-url=https://web.archive.org/web/20181023054848/http://cseligman.com/text/atlas/ngc42a.htm#4261
| dead-url=no
}}</ref>

<ref name="ned">{{cite web
| title=NASA/IPAC Extragalactic Database
| work=Results for NGC 4261
| url=http://nedwww.ipac.caltech.edu/cgi-bin/nph-objsearch?objname=NGC+4261&img_stamp=yes&extend=no
| access-date=2007-03-30
| archive-date=2020-01-04
| archive-url=https://web.archive.org/web/20200104003119/http://nedwww.ipac.caltech.edu/cgi-bin/nph-objsearch?objname=NGC+4261&img_stamp=yes&extend=no
| dead-url=no
}}</ref>

<ref name=vanDenBergh2002>{{cite journal
| title=Classifications of the Host Galaxies of Supernovae
| display-authors=1 | last1=van den Bergh | first1=Sidney
| last2=Li | first2=Weidong | last3=Filippenko | first3=Alexei V.
| journal=The Publications of the Astronomical Society of the Pacific
| volume=114 | issue=798 | pages=820–825 | date=August 2002
| arxiv=astro-ph/0204298 | bibcode=2002PASP..114..820V
| doi=10.1086/341709 | s2cid=46679854 }}</ref>

<ref name=Modjaz2001>{{cite journal
| title=Supernova 2001A in NGC 4261
| display-authors=1 | last1=Modjaz | first1=M.
| last2=Li | first2=W. D. | last3=Schwartz | first3=M.
| journal=IAU Circular
| volume=7554 | page=2 | date=January 2001
| editor1-last=Green | editor1-first=D. W. E.
| bibcode=2001IAUC.7554....2M }}</ref>

<ref name=Zezas2003>{{cite journal
| title=NGC 4261 and NGC 4697: Rejuvenated Elliptical Galaxies
| last1=Zezas | first1=A. | last2=Hernquist | first2=L.
| last3=Fabbiano | first3=G. | last4=Miller | first4=J.
| display-authors=1 | journal=The Astrophysical Journal
| volume=599 | issue=2 | pages=L73–L77 | date=December 2003
| arxiv=astro-ph/0310567 | bibcode=2003ApJ...599L..73Z
| doi=10.1086/380895 | s2cid=15195053 }}</ref>

<ref name=Paturel2003>{{Cite journal
| last1=Paturel | first1=G. | last2=Petit | first2=C.
| last3=Prugniel | first3=Ph. | last4=Theureau | first4=G.
| last5=Rousseau | first5=J. | last6=Brouty | first6=M.
| last7=Dubois | first7=P. | last8=Cambrésy | first8=L.
| title=HYPERLEDA. I. Identification and designation of galaxies
| display-authors=1 | journal=Astronomy and Astrophysics
| volume=412 | pages=45–55 | date=December 2003
| doi=10.1051/0004-6361:20031411 | doi-access=free
| bibcode=2003A&A...412...45P }}</ref>

<ref name=Véron-Cetty2010>{{cite journal
| last1=Véron-Cetty | first1=M.-P. | last2=Véron | first2=P.
| title=A catalogue of quasars and active nuclei
| journal=[[Astronomy & Astrophysics]]
| year=2010 | volume=518 | id=A10 | version=13th
| doi=10.1051/0004-6361/201014188 | doi-access=free
| bibcode=2010A&A...518A..10V }}</ref>

<ref name=Truebenbach2017>{{cite journal
| title=The VLBA Extragalactic Proper Motion Catalog and a Measurement of the Secular Aberration Drift
| last1=Truebenbach | first1=Alexandra E.
| last2=Darling | first2=Jeremy
| journal=The Astrophysical Journal Supplement Series
| volume=233 | issue=1 | id=3 | pages=16 | date=November 2017
| bibcode=2017ApJS..233....3T | doi=10.3847/1538-4365/aa9026 | arxiv=1710.02099 | s2cid=119200128 | doi-access=free }}</ref>

<ref name="jensenetal2003">{{cite journal
| title=Measuring Distances and Probing the Unresolved Stellar Populations of Galaxies Using Infrared Surface Brightness Fluctuations
| url=https://archive.org/details/sim_astrophysical-journal_2003-02-01_583_2/page/712
| last1=Jensen | first1=Joseph B. | last2=Tonry | first2=John L.
| last3=Barris | first3=Brian J. | last4=Thompson | first4=Rodger I.
| last5=Liu | first5=Michael C. | last6=Rieke | first6=Marcia J.
| last7=Ajhar | first7=Edward A. | last8=Blakeslee | first8=John P.
| display-authors=1 | journal=Astrophysical Journal
| date=February 2003 | volume=583 | issue=2 | pages=712–726
| bibcode=2003ApJ...583..712J | arxiv = astro-ph/0210129
| doi=10.1086/345430 | s2cid=551714 }}</ref>

<ref name=Davis1995>{{cite journal | title=Diffuse hot gas in the NGC 4261 group of galaxies | last1=Davis | first1=David S. | last2=Mushotzky | first2=Richard F. | last3=Mulchaey | first3=John S. | last4=Worrall | first4=D. M. | last5=Birkinshaw | first5=M. | last6=Burstein | first6=David | display-authors=1 | journal=Astrophysical Journal | volume=444 | issue=2 | pages=582–589 | date=1995 | bibcode=1995ApJ...444..582D | doi=10.1086/175632 | url=https://cds.cern.ch/record/278298/files/SCAN-9503134.pdf | access-date=2024-11-30 | archive-date=2024-12-04 | archive-url=https://web.archive.org/web/20241204172333/https://cds.cern.ch/record/278298/files/SCAN-9503134.pdf | dead-url=no }}</ref>

<ref name="STScI-1997-01">{{cite web
| date=1997-01-13
| title=Massive Black Holes Dwell in Most Galaxies, According to Hubble Census
| publisher=Hubblesite STScI-1997-01
| url=https://hubblesite.org/contents/news-releases/1997/news-1997-01.html
| access-date=2024-09-05
| archive-date=2023-08-23
| archive-url=https://web.archive.org/web/20230823182821/https://hubblesite.org/contents/news-releases/1997/news-1997-01.html
| dead-url=no
}}</ref>

<ref name="STScI-1995-47">{{cite web
| date=1995-12-04
| title=Hubble Finds a New Black Hole – and Unexpected New Mysteries
| publisher=Hubblesite STScI-1995-47
| url=https://hubblesite.org/contents/news-releases/1995/news-1995-47.html
| access-date=2024-09-05
| archive-date=2023-08-24
| archive-url=https://web.archive.org/web/20230824044233/https://hubblesite.org/contents/news-releases/1995/news-1995-47.html
| dead-url=no
}}</ref>

<ref name="atlas">{{cite web
| title=The Virgo Cluster
| publisher=An Atlas of the Universe
| url=http://www.atlasoftheuniverse.com/galgrps/vir.html
| access-date=2010-05-02
| archive-date=2016-03-09
| archive-url=https://web.archive.org/web/20160309221951/http://www.atlasoftheuniverse.com/galgrps/vir.html
| dead-url=no
}}</ref>

<ref name="astro162">{{cite web
| title=The Giant Elliptical Galaxy NGC 4261
| publisher=Astronomy 162 (Dept. Physics & Astronomy University of Tennessee)
| url=http://csep10.phys.utk.edu/astr162/lect/active/ngc4261.html
| access-date=2010-05-02
| archive-date=1999-10-09
| archive-url=https://web.archive.org/web/19991009170339/http://csep10.phys.utk.edu/astr162/lect/active/ngc4261.html
| dead-url=yes
}}</ref>

<ref name=Ruffa>{{cite journal
| doi=10.1093/mnras/stad1119 | doi-access=free | date=2023
| title=WISDOM project – XIV. SMBH mass in the early-type galaxies NGC 0612, NGC 1574, and NGC 4261 from CO dynamical modelling
| last1=Ruffa | first1=Ilaria | last2=Davis | first2=Timothy A.
| last3=Cappellari | first3=Michele | last4=((Bureau)) | first4=Martin
| last5=Elford | first5=Jacob | last6=Iguchi | first6=Satoru
| last7=Lelli | first7=Federico | last8=Liang | first8=Fu-Heng
| last9=Liu | first9=Lijie | last10=Lu | first10=Anan
| last11=Sarzi | first11=Marc | last12=Williams | first12=Thomas G.
| journal=Monthly Notices of the Royal Astronomical Society
| volume=522 | issue=4 | pages=6170–6195 | arxiv=2304.06117
| bibcode=2023MNRAS.522.6170R }}</ref>

}}

==外部連結==
{{commons category}}
* [http://hubblesource.stsci.edu/sources/video/clips/details/images/ngc4261_2.mpg Animation of the black hole in the center of NGC 4261] {{Wayback|url=http://hubblesource.stsci.edu/sources/video/clips/details/images/ngc4261_2.mpg |date=20200226174420 }}

{{Ngc45}}

[[Category:橢圓星系]]
[[Category:室女座NGC天體|4261]]
[[Category:UGC天體|7360]]
[[Category:PGC天體|39659]]
[[Category:室女座星系團]]

NGC 4261 - 版本历史

imported>InternetArchiveBot：​Add 1 book for verifiability (20251017sim)) #IABot (v2.0.9.5) (GreenC bot

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