Arp 104

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. 29: 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). 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?". 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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