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zwicky1956, apparent magnitudes, Atlas of Interacting Galaxies (VV) numbers
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|dec={{DEC|+62|44|02}}<ref name="ned-arp104" />
|dec={{DEC|+62|44|02}}<ref name="ned-arp104" />
|z=0.010817<ref name="ned-arp104" />
|z=0.010817<ref name="ned-arp104" />
|dist_ly=1.73 × 10<sup>7</sup><ref name="plotner2008" />
|dist_ly=1.73 × 10<sup>7</sup><ref name="plotner2008" /><ref name="zwicky1956" />
|type=E0/SBb-pec<ref name="roche2006">{{cite web
|type=E0/SBb-pec<ref name="roche2006">{{cite web
|url=http://arxiv.org/pdf/astro-ph/0605015v1
|url=http://arxiv.org/pdf/astro-ph/0605015v1
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|format=PDF
|format=PDF
|pages=1}} {{arxiv|astro-ph|0605015v1}}</ref>
|pages=1}} {{arxiv|astro-ph|0605015v1}}</ref>
|appmag_v=
|appmag_v=14.0<ref name="ingc5216">{{cite web
|url=http://seds.org/~spider/ngc/ngc.cgi?5216
|title= NGC 5216
|accessdate=2008-08-03
|work=The interactive NGC catalog online
|publisher=[[Students for the Exploration and Development of Space]] (SEDS)
}}</ref>/12.3<ref name="ingc5218">{{cite web
|url=http://seds.org/~spider/ngc/ngc.cgi?5218
|title= NGC 5218
|accessdate=2008-08-03
|work=The interactive NGC catalog online
|publisher=[[Students for the Exploration and Development of Space]] (SEDS)
}}</ref>
|size_v=
|size_v=
|notes=bridged<ref name="plotner2008" />
|notes=bridged<ref name="plotner2008" />
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|date=1999-11-10
|date=1999-11-10
|format=PDF
|format=PDF
|pages=13}} {{arxiv|astro-ph|9911186}}</ref>}}
|pages=13}} {{arxiv|astro-ph|9911186}}</ref><br />
[[Atlas of Interacting Galaxies|VV]] 33a<ref name="simbad-ngc5216">{{cite web
|url=http://simbad3.u-strasbg.fr/sim-id.pl?Ident=NGC5216
|title=NGC 5216 -- Interacting Galaxies
|accessdate=2008-08-03
|work=[[SIMBAD]] astronomical object database
|publisher=Centre de Données astronomiques de Strasbourg}}</ref>/VV 33b<ref name="simbad-ngc5218">{{cite web
|url=http://simbad3.u-strasbg.fr/sim-id.pl?Ident=NGC5218
|title=NGC 5216 -- Interacting Galaxies
|accessdate=2008-08-03
|work=[[SIMBAD]] astronomical object database
|publisher=Centre de Données astronomiques de Strasbourg}}</ref>}}


'''Arp 104''', also known as '''Keenan's system''', is entry 104 in [[Halton Arp]]'s [[Atlas of Peculiar Galaxies]] catalog for spiral galaxy [[NGC 5216]] and globular galaxy [[NGC 5218]].<ref name="plotner2008">{{cite web
'''Arp 104''', also known as '''Keenan's system''', is entry 104 in [[Halton Arp]]'s [[Atlas of Peculiar Galaxies]] catalog for spiral galaxy [[NGC 5216]] and globular galaxy [[NGC 5218]].<ref name="plotner2008">{{cite web
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|first=Tammy
|first=Tammy
|date=2008-07-25
|date=2008-07-25
|publisher=Universe Today}}</ref> The two galaxies are joined by a bridge of galactic material spanning 22&nbsp;000 light years.<ref name="plotner2008" />
|publisher=Universe Today}}</ref> The two galaxies are joined by a bridge of galactic material spanning 22&nbsp;000 light years.<ref name="plotner2008" /><ref name="zwicky1956">{{cite journal
|last=Zwicky
|first=Fritz
|authorlink=Fritz Zwicky
|year=1956
|title=Multiple galaxies
|journal=Ergebnisse der exakten Naturwissenschaften
|volume=29
|pages=361
|bibcode=1956ErNW...29..344Z
|url=http://articles.adsabs.harvard.edu//full/1956ErNW...29..344Z/0000361.000.html
|accessdate=2008-08-02}}</ref>


In 1790 [[William Herschel]] discovered the galaxies, and in 1926 they were studied [[Edwin Hubble]].<ref name="plotner2008" /> In 1935 Philip C. Keenan first published a paper about the bridge connecting the galaxies<ref name="plotner2008" /><ref name="keenan1935">{{cite journal
In 1790 [[William Herschel]] discovered the galaxies, and in 1926 they were studied [[Edwin Hubble]].<ref name="plotner2008" /> In 1935 Philip C. Keenan first published a paper about the bridge connecting the galaxies<ref name="plotner2008" /><ref name="keenan1935">{{cite journal
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|last=Vorontsov-Vel'Iaminov
|last=Vorontsov-Vel'Iaminov
|first=B. A.
|first=B. A.
|authorlink=Boris Vorontsov-Velyaminov
|date=1958
|date=1958
|title=The interaction of galaxies and the nature of their arms, spanning filaments and tails. The morphology of galaxies. V.
|title=The interaction of galaxies and the nature of their arms, spanning filaments and tails. The morphology of galaxies. V.
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|pages=858
|pages=858
|bibcode=1958AZh....35..858V
|bibcode=1958AZh....35..858V
|accessdate=2008-08-02}}</ref>.
|accessdate=2008-08-02}}</ref><ref name="zwicky1956" />.


==References==
==References==

Revision as of 15:08, 3 August 2008

Arp 104
Observation data (J2000[1] epoch)
ConstellationUrsa Major[2]
Right ascension13h 32m 08.9s[1]
Declination+62° 44′ 02″[1]
Redshift0.010817[1]
Distance1.73 × 107[2][3]
Apparent magnitude (V)14.0[4]/12.3[5]
Characteristics
TypeE0/SBb-pec[6]
Notable featuresbridged[2]
Other designations
Keenan's system[2][1]

NGC 5216/NGC 5218[2][1]
UGC 8528/UGC 8529[7]

VV 33a[8]/VV 33b[9]

Arp 104, also known as Keenan's system, is entry 104 in Halton Arp's Atlas of Peculiar Galaxies catalog for spiral galaxy NGC 5216 and globular galaxy NGC 5218.[2] The two galaxies are joined by a bridge of galactic material spanning 22 000 light years.[2][3]

In 1790 William Herschel discovered the galaxies, and in 1926 they were studied Edwin Hubble.[2] In 1935 Philip C. Keenan first published a paper about the bridge connecting the galaxies[2][10], which was rediscovered in 1958 at the Lick and Palomar observatories[2][11][3].

References

  1. ^ a b c d e f "Searching NED for object "ARP 104*"". NASA/IPAC Extragalactic Database (NED). Jet Propulsion Laboratory, California Institute of Technology. Retrieved 2008-08-02.
  2. ^ a b c d e f g h i j Plotner, Tammy (2008-07-25). "Bridge Across Space: "Keenan's System" by Martin Winder and Dietmar Hager". Universe Today. Retrieved 2008-08-02.
  3. ^ a b c Zwicky, Fritz (1956). "Multiple galaxies". Ergebnisse der exakten Naturwissenschaften. 29: 361. Bibcode:1956ErNW...29..344Z. Retrieved 2008-08-02.
  4. ^ "NGC 5216". The interactive NGC catalog online. Students for the Exploration and Development of Space (SEDS). Retrieved 2008-08-03.
  5. ^ "NGC 5218". The interactive NGC catalog online. Students for the Exploration and Development of Space (SEDS). Retrieved 2008-08-03.
  6. ^ Roche, Nathan (2006-04-29). "Imaging and spectroscopy of Arp 104: a post-starburst interacting pair with cross-fuelling?" (PDF). p. 1. Retrieved 2008-08-02. arXiv:astro-ph/0605015v1
  7. ^ Bushouse, Howard A. (1999-11-10). "The molecular gas-star formation connection in an optically-selected sample of interacting galaxies" (PDF). p. 13. Retrieved 2008-08-03. {{cite web}}: Unknown parameter |coauthors= ignored (|author= suggested) (help) arXiv:astro-ph/9911186
  8. ^ "NGC 5216 -- Interacting Galaxies". SIMBAD astronomical object database. Centre de Données astronomiques de Strasbourg. Retrieved 2008-08-03.
  9. ^ "NGC 5216 -- Interacting Galaxies". SIMBAD astronomical object database. Centre de Données astronomiques de Strasbourg. Retrieved 2008-08-03.
  10. ^ Keenan, Philip C. (1935). "An unusual pair of nebulae: NGC 5216 and 5218". Astrophysical Journal. 81: 355. Bibcode:1935ApJ....81..355K. doi:10.1086/143641. Retrieved 2008-08-02. {{cite journal}}: Unknown parameter |month= ignored (help)
  11. ^ Vorontsov-Vel'Iaminov, B. A. (1958). "The interaction of galaxies and the nature of their arms, spanning filaments and tails. The morphology of galaxies. V.". Astronomicheskii Zhurnal. 35: 858. Bibcode:1958AZh....35..858V. {{cite journal}}: |access-date= requires |url= (help)

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