Astronomy:Arp 104

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Short description: Pair of galaxies in the constellation of Ursa Major
Arp 104
NGC 5216 from the Schulman 0.8m Telescope at the Mount Lemmon Skycenter courtesy Adam Block.jpg
NGC 5216: The Keenan System, Arp 104
Observation data (J2000[1] epoch)
ConstellationUrsa Major[2]
Right ascension 13h 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]

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 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. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 "Searching NED for object "ARP 104*"". NASA/IPAC Extragalactic Database (NED). Jet Propulsion Laboratory, California Institute of Technology. http://nedwww.ipac.caltech.edu/cgi-bin/nph-objsearch?objname=arp+104&extend=yes&out_csys=Equatorial&out_equinox=J2000.0&obj_sort=RA+or+Longitude&of=pre_text&zv_breaker=30000.0&list_limit=5&img_stamp=YES. Retrieved 2008-08-02. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 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. https://web.archive.org/web/20080730141220/http://www.universetoday.com/2008/07/25/bridge-across-space-keenans-system-by-martin-winder-and-dietmar-hager/. Retrieved 2008-08-02. 
  3. ↑ 3.0 3.1 3.2 Zwicky, Fritz (1956). "Multiple galaxies". Ergebnisse der Exakten Naturwissenschaften. 29. pp. 361. doi:10.1007/BFb0118841. ISBN 978-3-540-74717-8. Bibcode: 1956ErNW...29..344Z. 
  4. ↑ "NGC 5216". The interactive NGC catalog online. Students for the Exploration and Development of Space (SEDS). http://seds.org/~spider/ngc/ngc.cgi?5216. Retrieved 2008-08-03. 
  5. ↑ "NGC 5218". The interactive NGC catalog online. Students for the Exploration and Development of Space (SEDS). http://seds.org/~spider/ngc/ngc.cgi?5218. 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. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NGC+5216#lab_ident. Retrieved 2009-01-14. 
  9. ↑ "NGC 5218 -- Galaxy in Pair of Galaxies". SIMBAD astronomical object database. Centre de Données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NGC+5218#lab_ident. Retrieved 2009-01-14. 
  10. ↑ Keenan, Philip C. (May 1935). "An unusual pair of nebulae: NGC 5216 and 5218". Astrophysical Journal 81: 355. doi:10.1086/143641. Bibcode: 1935ApJ....81..355K. 
  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. 

External links


Coordinates: Sky map 13h 32m 08.9s, +62° 44′ 02″




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