Astronomy:NGC 6217

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Short description: Galaxy in the constellation Ursa Minor
NGC 6217
NGC 6217 hs-2009-25-bc-full.jpg
NGC 6217 photographed by the Hubble Space Telescope
Observation data (J2000 epoch)
ConstellationUrsa Minor
Right ascension 16h 32m 39.217s[1]
Declination+78° 11′ 53.56″[1]
Redshift0.004543 ± 0.000013[2]
Helio radial velocity1,368[3] km/s
Distance67.2 Mly (20.6 Mpc)[3]
Apparent magnitude (V)11.2[4]
Characteristics
Type(R)SB(rs)bc[5]
Apparent size (V)55,000 light years
Other designations
ARP 185, UGC 10470[2][6]

NGC 6217 is a barred spiral galaxy located some 67 million light years away,[3] in the constellation Ursa Minor. It can be located with a 10 cm (4 in) or larger telescope as an 11th magnitude object about 2.5° east-northeast of the star Zeta Ursae Minoris.[4] The galaxy is inclined by an angle of 33° to the line of sight along a position angle of 162°.[3]

A morphological classification of (R')SB(rs)bc[5] indicates that NGC 6217 has a false outer ring-like structure formed from the spiral arms (R'), a well-defined bar running across the nucleus (SB), a partial inner ring (rs), and moderately-wound spiral arms (bc).[7] The nucleus is spherical in shape, showing no indication of oblateness.[5] The prominent bar spans an angular distance of 48″ (48 arc seconds) across the galaxy along a position angle of 35.97° ± 0.35°. At 10″ southeast of the nucleus is a prominent region of star formation. The inner ring is about 43″.5 across.[8]

NGC 6217 has been characterized as a starburst galaxy, which means it is undergoing a high rate of star formation compared to a typical galaxy. As a result, the spectrum is dominated by stellar photoionization from young, hot stars.[9] This component is less than 10 million years old, producing a blue-hued spectral continuum with absorption weak lines from elements other than hydrogen and helium.[6] At the core of the galaxy is a low-luminosity active galactic nucleus which has formed an H II region.[10]

One supernova has been observed in NGC 6217: SN 2018gj (Type II, mag 14.4).[11]

Gallery

References

  1. ↑ 1.0 1.1 Skrutskie, Michael F.; Cutri, Roc M.; Stiening, Rae; Weinberg, Martin D.; Schneider, Stephen E.; Carpenter, John M.; Beichman, Charles A.; Capps, Richard W. et al. (1 February 2006). "The Two Micron All Sky Survey (2MASS)". The Astronomical Journal 131 (2): 1163–1183. doi:10.1086/498708. ISSN 0004-6256. Bibcode: 2006AJ....131.1163S. https://ui.adsabs.harvard.edu/abs/2006AJ....131.1163S/abstract. 
  2. ↑ 2.0 2.1 "NGC 6216", NASA/IPAC Extragalactic Database, http://ned.ipac.caltech.edu/cgi-bin/objsearch?objname=NGC+6217, retrieved 2013-06-20. 
  3. ↑ 3.0 3.1 3.2 3.3 Gusev, A. S. et al. (August 2012), "Oxygen and nitrogen abundances of H II regions in six spiral galaxies", Monthly Notices of the Royal Astronomical Society 424 (3): 1930–1940, doi:10.1111/j.1365-2966.2012.21322.x, Bibcode: 2012MNRAS.424.1930G. 
  4. ↑ 4.0 4.1 O'Meara, Stephen James (2007), Steve O'Meara's Herschel 400 Observing Guide, Cambridge University Press, p. 227, ISBN 978-0521858939, https://books.google.com/books?id=Nyh9fAC_tpIC&pg=PA227. 
  5. ↑ 5.0 5.1 5.2 Ann, Hong Bae (December 2003), "CCD Surface Photometry of Spiral Galaxies: Bulge Morphology", Journal of the Korean Astronomical Society 36 (4): 261–270, doi:10.5303/jkas.2003.36.4.261, Bibcode: 2003JKAS...36..261A. 
  6. ↑ 6.0 6.1 Cid Fernandes, Roberto; González Delgado, Rosa M.; Schmitt, Henrique; Storchi-Bergmann, Thaisa; Martins, Lucimara P.; Pérez, Enrique; Heckman, Timothy; Leitherer, Claus et al. (April 2004), "The Stellar Populations of Low-Luminosity Active Galactic Nuclei. I. Ground-based Observations", Astrophysical Journal 605 (1): 105–126, doi:10.1086/382217, Bibcode: 2004ApJ...605..105C. 
  7. ↑ Buta, Ronald J. et al. (2007), Atlas of Galaxies, Cambridge University Press, pp. 13–17, ISBN 978-0521820486, https://books.google.com/books?id=g-P7dCbB5MEC&pg=PA16. 
  8. ↑ Cabrera-Lavers, A.; Garzón, F. (March 2004), "An Optical Study of a Sample of Spiral Galaxies", The Astronomical Journal 127 (3): 1386–1404, doi:10.1086/381924, Bibcode: 2004AJ....127.1386C. 
  9. ↑ Elfhag, T. et al. (February 1996), "A CO survey of galaxies with the SEST and the 20-m Onsala telescope", Astronomy and Astrophysics Supplement 115: 439–468, Bibcode: 1996A&AS..115..439E. 
  10. ↑ Véron-Cetty, M.-P.; Véron, P. (July 2010), "A catalogue of quasars and active nuclei", Astronomy and Astrophysics 518: A10, doi:10.1051/0004-6361/201014188, Bibcode: 2010A&A...518A..10V. 
  11. ↑ Transient Name Server entry for SN 2018gj. Retrieved 5 January 2023.

External links


Coordinates: Sky map 16h 32m 39.217s, ++78° 11′ 53.56″



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