Wikipedia

NGC 6217

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]

NGC 6217
NGC 6217 photographed by the Hubble Space Telescope
Observation data (J2000 epoch)
ConstellationUrsa Minor
Right ascension16h 32m 39.217s[1]
Declination 78° 11′ 53.56″[1]
Redshift0.004543 ± 0.000013[2]
Heliocentric 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]

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]

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References

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  1. ^ a b Skrutskie, Michael F.; Cutri, Roc M.; Stiening, Rae; Weinberg, Martin D.; Schneider, Stephen E.; Carpenter, John M.; Beichman, Charles A.; Capps, Richard W.; Chester, Thomas; Elias, Jonathan H.; Huchra, John P.; Liebert, James W.; Lonsdale, Carol J.; Monet, David G.; Price, Stephan; Seitzer, Patrick; Jarrett, Thomas H.; Kirkpatrick, J. Davy; Gizis, John E.; Howard, Elizabeth V.; Evans, Tracey E.; Fowler, John W.; Fullmer, Linda; Hurt, Robert L.; Light, Robert M.; Kopan, Eugene L.; Marsh, Kenneth A.; McCallon, Howard L.; Tam, Robert; Van Dyk, Schuyler D.; Wheelock, Sherry L. (1 February 2006). "The Two Micron All Sky Survey (2MASS)". The Astronomical Journal. 131 (2): 1163–1183. Bibcode:2006AJ....131.1163S. doi:10.1086/498708. ISSN 0004-6256. S2CID 18913331.1163-1183&rft.date=2006-02-01&rft_id=info:doi/10.1086/498708&rft_id=https://api.semanticscholar.org/CorpusID:18913331#id-name=S2CID&rft.issn=0004-6256&rft_id=info:bibcode/2006AJ....131.1163S&rft.aulast=Skrutskie&rft.aufirst=Michael F.&rft.au=Cutri, Roc M.&rft.au=Stiening, Rae&rft.au=Weinberg, Martin D.&rft.au=Schneider, Stephen E.&rft.au=Carpenter, John M.&rft.au=Beichman, Charles A.&rft.au=Capps, Richard W.&rft.au=Chester, Thomas&rft.au=Elias, Jonathan H.&rft.au=Huchra, John P.&rft.au=Liebert, James W.&rft.au=Lonsdale, Carol J.&rft.au=Monet, David G.&rft.au=Price, Stephan&rft.au=Seitzer, Patrick&rft.au=Jarrett, Thomas H.&rft.au=Kirkpatrick, J. Davy&rft.au=Gizis, John E.&rft.au=Howard, Elizabeth V.&rft.au=Evans, Tracey E.&rft.au=Fowler, John W.&rft.au=Fullmer, Linda&rft.au=Hurt, Robert L.&rft.au=Light, Robert M.&rft.au=Kopan, Eugene L.&rft.au=Marsh, Kenneth A.&rft.au=McCallon, Howard L.&rft.au=Tam, Robert&rft.au=Van Dyk, Schuyler D.&rft.au=Wheelock, Sherry L.&rft_id=https://doi.org/10.1086%2F498708&rfr_id=info:sid/en.wikipedia.org:NGC 6217" class="Z3988">
  2. ^ a b "NGC 6216", NASA/IPAC Extragalactic Database, retrieved 2013-06-20.
  3. ^ a b c d 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, arXiv:1205.3910, Bibcode:2012MNRAS.424.1930G, doi:10.1111/j.1365-2966.2012.21322.x, S2CID 118437910.1930-1940&rft.date=2012-08&rft_id=info:arxiv/1205.3910&rft_id=https://api.semanticscholar.org/CorpusID:118437910#id-name=S2CID&rft_id=info:doi/10.1111/j.1365-2966.2012.21322.x&rft_id=info:bibcode/2012MNRAS.424.1930G&rft.aulast=Gusev&rft.aufirst=A. S.&rft.au=Pilyugin, L. S.&rft.au=Sakhibov, F.&rft.au=Dodonov, S. N.&rft.au=Ezhkova, O. V.&rft.au=Khramtsova, M. S.&rft.au=Garzón, F.&rfr_id=info:sid/en.wikipedia.org:NGC 6217" class="Z3988">
  4. ^ a b O'Meara, Stephen James (2007), Steve O'Meara's Herschel 400 Observing Guide, Cambridge University Press, p. 227, ISBN 978-0521858939.
  5. ^ a b c Ann, Hong Bae (December 2003), "CCD Surface Photometry of Spiral Galaxies: Bulge Morphology", Journal of the Korean Astronomical Society, 36 (4): 261–270, Bibcode:2003JKAS...36..261A, doi:10.5303/jkas.2003.36.4.261.261-270&rft.date=2003-12&rft_id=info:doi/10.5303/jkas.2003.36.4.261&rft_id=info:bibcode/2003JKAS...36..261A&rft.aulast=Ann&rft.aufirst=Hong Bae&rfr_id=info:sid/en.wikipedia.org:NGC 6217" class="Z3988">
  6. ^ a b Cid Fernandes, Roberto; González Delgado, Rosa M.; Schmitt, Henrique; Storchi-Bergmann, Thaisa; Martins, Lucimara P.; Pérez, Enrique; Heckman, Timothy; Leitherer, Claus; Schaerer, Daniel (April 2004), "The Stellar Populations of Low-Luminosity Active Galactic Nuclei. I. Ground-based Observations", Astrophysical Journal, 605 (1): 105–126, arXiv:astro-ph/0401416, Bibcode:2004ApJ...605..105C, doi:10.1086/382217, S2CID 119101213.105-126&rft.date=2004-04&rft_id=info:arxiv/astro-ph/0401416&rft_id=https://api.semanticscholar.org/CorpusID:119101213#id-name=S2CID&rft_id=info:doi/10.1086/382217&rft_id=info:bibcode/2004ApJ...605..105C&rft.aulast=Cid Fernandes&rft.aufirst=Roberto&rft.au=González Delgado, Rosa M.&rft.au=Schmitt, Henrique&rft.au=Storchi-Bergmann, Thaisa&rft.au=Martins, Lucimara P.&rft.au=Pérez, Enrique&rft.au=Heckman, Timothy&rft.au=Leitherer, Claus&rft.au=Schaerer, Daniel&rfr_id=info:sid/en.wikipedia.org:NGC 6217" class="Z3988">
  7. ^ Buta, Ronald J.; et al. (2007), Atlas of Galaxies, Cambridge University Press, pp. 13–17, ISBN 978-0521820486.13-17&rft.pub=Cambridge University Press&rft.date=2007&rft.isbn=978-0521820486&rft.aulast=Buta&rft.aufirst=Ronald J.&rft.au=Corwin, Harold G.&rft.au=Odewahn, Stephen C.&rft_id=https://books.google.com/books?id=g-P7dCbB5MEC&pg=PA16&rfr_id=info:sid/en.wikipedia.org:NGC 6217" class="Z3988">
  8. ^ Cabrera-Lavers, A.; Garzón, F. (March 2004), "An Optical Study of a Sample of Spiral Galaxies", The Astronomical Journal, 127 (3): 1386–1404, Bibcode:2004AJ....127.1386C, doi:10.1086/381924.1386-1404&rft.date=2004-03&rft_id=info:doi/10.1086/381924&rft_id=info:bibcode/2004AJ....127.1386C&rft.aulast=Cabrera-Lavers&rft.aufirst=A.&rft.au=Garzón, F.&rfr_id=info:sid/en.wikipedia.org:NGC 6217" class="Z3988">
  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.439-468&rft.date=1996-02&rft_id=info:bibcode/1996A&AS..115..439E&rft.aulast=Elfhag&rft.aufirst=T.&rft.au=Booth, R. S.&rft.au=Hoeglund, B.&rft.au=Johansson, L. E. B.&rft.au=Sandqvist, A.&rfr_id=info:sid/en.wikipedia.org:NGC 6217" class="Z3988">
  10. ^ Véron-Cetty, M.-P.; Véron, P. (July 2010), "A catalogue of quasars and active nuclei", Astronomy and Astrophysics, 518 (13th ed.): A10, Bibcode:2010A&A...518A..10V, doi:10.1051/0004-6361/201014188.
  11. ^ Transient Name Server entry for SN 2018gj. Retrieved 5 January 2023.
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