NGC 6217

NGC 6217
NGC 6217
	NGC 6217 photographed by the Hubble Space Telescope
Observation data (J2000 epoch)
Constellation	Ursa Minor
Right ascension	16h 32m 39.217s
Declination	+78° 11′ 53.56″
Redshift	0.004543 ± 0.000013
Heliocentric radial velocity	1,368 km/s
Distance	67.2 Mly (20.6 Mpc)
Apparent magnitude (V)	11.2
Characteristics
Type	(R)SB(rs)bc
Apparent size (V)	55,000 light years
Other designations
	ARP 185, UGC 10470

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

SDSS
2MASS (near-infrared)

References

^ ^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.
^ ^a ^b "NGC 6216", NASA/IPAC Extragalactic Database, retrieved 2013-06-20.
^ ^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.
^ ^a ^b O'Meara, Stephen James (2007), Steve O'Meara's Herschel 400 Observing Guide, Cambridge University Press, p. 227, ISBN 978-0521858939.
^ ^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.
^ ^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.
^ Buta, Ronald J.; et al. (2007), Atlas of Galaxies, Cambridge University Press, pp. 13–17, ISBN 978-0521820486.
^ 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.
^ 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.
^ 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.
^ Transient Name Server entry for SN 2018gj. Retrieved 5 January 2023.

External links

Media related to NGC 6217 at Wikimedia Commons
"Hubble Opens New Eyes on the Universe", Hubble Site news Center, NASA, September 9, 2009, retrieved 2013-06-18
"NGC 6217". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2013-06-20.

[ApJ131_1163-1] 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.

[NED-2] "NGC 6216", NASA/IPAC Extragalactic Database, retrieved 2013-06-20.

[Gusev2012-3] 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, arXiv:1205.3910, Bibcode:2012MNRAS.424.1930G, doi:10.1111/j.1365-2966.2012.21322.x, S2CID 118437910.

[OMeara2007-4] O'Meara, Stephen James (2007), Steve O'Meara's Herschel 400 Observing Guide, Cambridge University Press, p. 227, ISBN 978-0521858939.

[Ann2003-5] 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.

[Fernandes2004-6] 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.

[Buta2007-7] Buta, Ronald J.; et al. (2007), Atlas of Galaxies, Cambridge University Press, pp. 13–17, ISBN 978-0521820486.

[Cabrera2004-8] 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.

[Elfhag1996-9] 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.

[Cetty2010-10] 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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NGC 6217

Gallery

References

External links

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