Arp 104 Explained

Arp 104
Epoch:J2000
Constellation Name:Ursa Major
Ra:[1]
Z:0.010817
Dist Ly:1.73 × 107
Type:E0/SBb-pec[2]
Appmag V:14.0[3] /12.3[4]
Notes:bridged
Names:Keenan's system
NGC 5216/NGC 5218
UGC 8528/UGC 8529[5]
VV 33a[6] /VV 33b[7]

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.[8] The two galaxies are joined by a bridge of galactic material spanning 22 000 light years.[9]

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

External links

Notes and References

  1. Web site: Searching NED for object "ARP 104*" . 2008-08-02 . NASA/IPAC Extragalactic Database (NED) . Jet Propulsion Laboratory, California Institute of Technology.
  2. astro-ph/0605015 . Imaging and spectroscopy of Arp 104: a post-starburst interacting pair with cross-fuelling? . Roche . Nathan . 2006-04-29.
  3. Web site: NGC 5216 . https://archive.today/20121228035147/http://seds.org/~spider/ngc/ngc.cgi?5216 . dead . 2012-12-28 . 2008-08-03 . The interactive NGC catalog online . Students for the Exploration and Development of Space (SEDS) .
  4. Web site: NGC 5218 . https://archive.today/20121221001410/http://seds.org/~spider/ngc/ngc.cgi?5218 . dead . 2012-12-21 . 2008-08-03 . The interactive NGC catalog online . Students for the Exploration and Development of Space (SEDS) .
  5. astro-ph/9911186 . The molecular gas-star formation connection in an optically-selected sample of interacting galaxies . Bushouse . Howard A. . Steven D. Lord . Susan A. Lamb . Michael W. Werner . K. Y. Lo . 1999-11-10.
  6. Web site: VV 33a -- Interacting Galaxies. 2009-01-14. SIMBAD astronomical object database. Centre de Données astronomiques de Strasbourg.
  7. Web site: NGC 5218 -- Galaxy in Pair of Galaxies. 2009-01-14. SIMBAD astronomical object database. Centre de Données astronomiques de Strasbourg.
  8. Web site: Bridge Across Space: "Keenan's System" by Martin Winder and Dietmar Hager . 2008-08-02 . Plotner . Tammy . 2008-07-25 . . https://web.archive.org/web/20080730141220/http://www.universetoday.com/2008/07/25/bridge-across-space-keenans-system-by-martin-winder-and-dietmar-hager/ . 2008-07-30 . live .
  9. Book: Zwicky , Fritz . Fritz Zwicky

    . Ergebnisse der Exakten Naturwissenschaften. Fritz Zwicky. 1956. Multiple galaxies. 29. 361. 1956ErNW...29..344Z. 10.1007/BFb0118841. 978-3-540-74717-8.

  10. Keenan. Philip C.. May 1935. An unusual pair of nebulae: NGC 5216 and 5218. Astrophysical Journal. 81. 355. 10.1086/143641. 1935ApJ....81..355K.
  11. Vorontsov-Vel'Iaminov. B. A.. Boris Vorontsov-Velyaminov. 1958. The interaction of galaxies and the nature of their arms, spanning filaments and tails. The morphology of galaxies. V. Astronomicheskii Zhurnal. 35. 858. 1958AZh....35..858V.

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