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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]

Arp 104
NGC 5216: The Keenan System, 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[1][2]

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

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

In 1790 William Herschel discovered the galaxies, and in 1926 they were studied by 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][3][11]


References


  1. "Searching NED for object "ARP 104*"". NASA/IPAC Extragalactic Database (NED). Jet Propulsion Laboratory, California Institute of Technology. Retrieved 2008-08-02.
  2. Plotner, Tammy (2008-07-25). "Bridge Across Space: "Keenan's System" by Martin Winder and Dietmar Hager". Universe Today. Archived from the original on 2008-07-30. Retrieved 2008-08-02.
  3. Zwicky, Fritz (1956). "Multiple galaxies". Ergebnisse der Exakten Naturwissenschaften. Ergebnisse der Exakten Naturwissenschaften. Vol. 29. p. 361. Bibcode:1956ErNW...29..344Z. doi:10.1007/BFb0118841. ISBN 978-3-540-74717-8.
  4. "NGC 5216". The interactive NGC catalog online. Students for the Exploration and Development of Space (SEDS). Archived from the original on 2012-12-28. Retrieved 2008-08-03.
  5. "NGC 5218". The interactive NGC catalog online. Students for the Exploration and Development of Space (SEDS). Archived from the original on 2012-12-21. Retrieved 2008-08-03.
  6. Roche, Nathan (2006-04-29). "Imaging and spectroscopy of Arp 104: a post-starburst interacting pair with cross-fuelling?". arXiv:astro-ph/0605015.
  7. Bushouse, Howard A.; Steven D. Lord; Susan A. Lamb; Michael W. Werner; K. Y. Lo (1999-11-10). "The molecular gas-star formation connection in an optically-selected sample of interacting galaxies". arXiv:astro-ph/9911186.
  8. "VV 33a -- Interacting Galaxies". SIMBAD astronomical object database. Centre de Données astronomiques de Strasbourg. Retrieved 2009-01-14.
  9. "NGC 5218 -- Galaxy in Pair of Galaxies". SIMBAD astronomical object database. Centre de Données astronomiques de Strasbourg. Retrieved 2009-01-14.
  10. Keenan, Philip C. (May 1935). "An unusual pair of nebulae: NGC 5216 and 5218". Astrophysical Journal. 81: 355. Bibcode:1935ApJ....81..355K. doi:10.1086/143641.
  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.


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[de] Arp 104

Arp 104, engl. auch bekannt als Keenan’s system, ist ein interagierendes Galaxienpaar im Sternbild Ursa Major. Es besteht aus den beiden Galaxien NGC 5216 und NGC 5218, die durch eine schwach leuchtende Brücke verbunden sind. Das System ist etwa 137 Millionen Lichtjahre von der Milchstraße entfernt. Halton Arp gliederte seinen Katalog ungewöhnlicher Galaxien nach rein morphologischen Kriterien in Gruppen. Diese Galaxie gehört zu der Klasse elliptischer Galaxien mit Verbindung zu Spiralen.
- [en] Arp 104


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