| 词条 | NGC 4151 |
| 释义 |
| name = NGC 4151 | image = NGC4151 Galaxy from the Mount Lemmon SkyCenter Schulman Telescope courtesy Adam Block.jpg | image_size = 300px |caption = Image of NGC 4151 from the 0.8m Schulman Telescope at the Mount Lemmon SkyCenter | credit= Adam Block | epoch = J2000 | type = (R')SAB(rs)ab,[1] Sy1[2] | ra = {{RA|12|10|32.6}}[1] | dec = {{DEC|+39|24|21}}[1] | dist_ly = {{convert|19|Mpc|e6ly|abbr=on|lk=off}} [5] | z = 0.003262[2] 995 ± 3 km/s[1] | appmag_v = 11.5[1] | size_v = 6′.4 × 5′.5[1] | constellation name = Canes Venatici | notes = | names = UGC 7166,[1] PGC 38739[1] }} NGC 4151 is an intermediate spiral seyfert galaxy with weak inner ring structure located {{convert|19|Mpc|e6ly|abbr=off|lk=on}} from Earth[3] in the constellation Canes Venatici. The galaxy was first mentioned by William Herschel on March 17, 1787; it was one of the two Seyfert galaxies described in the paper [4] which defined the term. It is one of the nearest galaxies to Earth to contain an actively growing supermassive black hole;[5] it was speculated that the nucleus may host a binary black hole, with about 40 million and about 10 million solar masses respectively, orbiting with a 15.8-year period.[6] This is, however, still a matter of active debate. Some astronomers nickname it the "Eye of Sauron" from its appearance.[7] X-ray sourceX-ray emission from NGC 4151 was apparently first detected on December 24, 1970, with the X-ray observatory satellite Uhuru,[8] although the observation spanned an error-box of 0.56 square degrees and there is some controversy as to whether UHURU might not have detected the BL Lac object 1E 1207.9 +3945, which is inside their error box - the later HEAO 1 detected an X-ray source of NGC 4151 at 1H 1210+393,[9] coincident with the optical position of the nucleus and outside the error box of Uhuru.[8] To explain the X-ray emission two different possibilities have been proposed:[10]
See also
References1. ^1 2 3 4 5 6 7 {{cite web | publisher= NASA/IPAC Extragalactic Database | title= Results for NGC 4151 | url= http://nedwww.ipac.caltech.edu/ | accessdate= 2007-03-27 }} 2. ^1 {{cite simbad | title= NGC 4151 | access-date= 2014-06-06 }} 3. ^1 {{cite web |title= 'Eye of Sauron' Provides New Way of Measuring Distances to Galaxies |url= http://www.keckobservatory.org/recent/entry/eye_of_sauron_provides_new_way_of_measuring_distances_to_galaxies |accessdate= 2014-11-27 |date= 2014-11-26 |publisher= W. M. Keck Observatory |author= W. M. Keck Observatory }} 4. ^{{cite journal | author=C. K. Seyfert | title=Nuclear Emission in Spiral Nebulae | journal=Astrophysical Journal | date=1943 | volume=97 | pages=28–40 | bibcode=1943ApJ....97...28S | doi=10.1086/144488}} 5. ^{{cite web|title=NGC 4151: An active black hole in the "Eye of Sauron"|url=http://www.astronomy.com/News-Observing/News/2011/03/NGC%204151%20active%20black%20hole%20in%20the%20Eye%20of%20Sauron.aspx|publisher=Astronomy magazine|accessdate=2011-03-14|date=2011-03-11}} 6. ^{{Cite journal| arxiv=1209.4524 | display-authors=4 | author1=Bon | author2=Jovanović | author3=Marziani | author4=Shapovalova | author5=Bon | author6=Borka Jovanović | author7=Borka | author8=Sulentic | author9=Popović | title=The First Spectroscopically Resolved Sub-parsec Orbit of a Supermassive Binary Black Hole | journal=The Astrophysical Journal | volume=759 | issue=2 | pages=118–125 | date=2012| doi=10.1088/0004-637X/759/2/118 |bibcode = 2012ApJ...759..118B }} 7. ^{{cite web |url= http://chandra.harvard.edu/photo/2011/n4151/ |title= NGC 4151: An Active Black Hole in the "Eye of Sauron" |publisher= Chandra X-ray Center |author= Chandra X-ray Observatory |date= 10 March 2011 }} 8. ^1 {{cite journal |author=Gursky H |display-authors=4 |author2=Kellogg EM |author3= Leong C |author4=Tananbaum H |author5=Giacconi R |title=Detection of X-Rays from the Seyfert Galaxies NGC 1275 and NGC 4151 by the UHURU Satellite |journal=Astrophys J |date=Apr 1971 |volume=165 |issue=4 |pages=L43–8 |bibcode=1971ApJ...165L..43G |doi=10.1086/180713 }} 9. ^{{cite journal |doi=10.1086/190992 |author=Wood KS |display-authors=4 |author2=Meekins JF |author3=Yentis DJ |author4=Smathers HW |author5=McNutt DP |author6=Bleach RD |title=The HEAO A-1 X-ray source catalog |journal=Astrophys. J. Suppl. Ser. |date=December 1984 |volume=56 |issue=12 |pages=507–649 |bibcode=1984ApJS...56..507W }} 10. ^{{cite web |title= The 'Eye of Sauron' |url= http://www.nasa.gov/mission_pages/chandra/multimedia/11-029.html |accessdate= 2011-03-14 |date= 2011-03-10 |publisher= NASA |author= Chandra X-Ray Observatory }} External links{{Commons category}}
11 : Galaxies discovered in 1787|Intermediate spiral galaxies|Seyfert galaxies|Canes Venatici|NGC objects|UGC objects|Principal Galaxies Catalogue objects|X-ray astronomy|Astronomical X-ray sources|Articles containing video clips|Astronomical objects discovered in 1787 |
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