NGC 2336 explained

NGC 2336
Epoch:J2000
Type:SAB(r)bc [1]
Dist Ly:90.7 ± 28 Mly (27.8 ± 8.6 Mpc)
Z:0.007352 +/- 0.000003
H Radial V:2204 ± 1 km/s
Appmag V:10.3
Size V:7.1 × 3.9
Constellation Name:Camelopardalis
Names:UGC 3809, MCG +13-06-006, PGC 21033

NGC 2336 is a barred spiral galaxy located in the constellation Camelopardalis. It is located at a distance of circa 100 million light years from Earth, which, given its apparent dimensions, means that NGC 2336 is about 200,000 light years across. It was discovered by Wilhelm Tempel in 1876.[2]

Characteristics

NGC 2336 is a barred spiral galaxy, featuring a small optical bar.[3] At least 8 spiral arms, with numerous HII regions,[4] emanate from the ring-like structure around the bar. This ring has a radius of approximately 34 arcseconds, which corresponds to 5.3 kpc at the distance of NGC 2336.[5]

In the large arms of the galaxy have been observed 28 HII regions that may host young massive star clusters, and for two of them the nebular emission comprises most of the flux. Three of these HII areas have ages calculated to be 100 to 300 million years and have sizes between 300 and 600 parsecs. It is suggested they are star complexes that may coexist with younger ones. The most massive of the HII regions, number 13, has a mass estimated to be and is 810pc across.[6] Observations in the ultraviolet showed 78 star forming regions, with two of them between the spiral arms and six at the galaxy ring. Their size is comparable to NGC 604, one of the largest nebulae in the Local Group. Star formation is more intense in the inner parts of the arms and at the ring.[7]

Scattered dust lanes which do not fit into a spiral structure have been observed in the nuclear region of the galaxy.[8] No emission has been detected in the radiowaves[3] and HI and Ha imaging of the nucleus of NGC 2336.[9] The nucleus is small, with an apparent diameter of 5 arcseconds, while the bulge is large, with a radius of 17 arcseconds.[5] In the centre of NGC 2336 lies a supermassive black hole whose mass is estimated to be 30 million (107.5) based on Ks bulge luminosity.[10]

Supernova

One supernova has been observed in NGC 2336, SN 1987L. It was discovered on 16 August 1987 at mag. 14.2 by American amateur astronomer James Dana Patchick. He used a home built 17.5" Dobsonian reflecting telescope for the visual discovery.[11] [12] The supernova was found as part of a team effort known as 'SUNSEARCH', started by Steve H. Lucas.[13] Spectrography performed by William Herschel Telescope on 20–21 October 1987 concluded that it was a type Ia supernova with its maximum approximately 100 days before.[14]

Nearby galaxies

NGC 2336 is the foremost galaxy of a small galaxy group known as the NGC 2336 group.[15] It forms a non-interacting pair with IC 467, which lies 20 arcminutes away.[16]

Notes and References

  1. Web site: NASA/IPAC Extragalactic Database . Results for NGC 2336 . 2016-01-18 .
  2. Web site: Seligman . Courtney . NGC 2336 . Celestial Atlas . 19 November 2018.
  3. Beck . R. . Shoutenkov . V. . Ehle . M. . Harnett . J. I. . Haynes . R. F. . Shukurov . A. . Sokoloff . D. D. . Thierbach . M. . Magnetic fields in barred galaxies . Astronomy & Astrophysics . 29 July 2002 . 391 . 1 . 83–102 . 10.1051/0004-6361:20020642. astro-ph/0107214 . 2002A&A...391...83B . 14749261 .
  4. Sandage, A., Bedke, J. (1994), The Carnegie Atlas of Galaxies. Volume I, Carnegie Institution of Washington, p. 15
  5. Gusev . A. S. . M.–G. Park . Structure and stellar population of ringed barred galaxy NGC 2336 . Astronomy & Astrophysics . 17 November 2003 . 410 . 1 . 117–129 . 10.1051/0004-6361:20031215. 2003A&A...410..117G . free .
  6. Gusev . A. S. . Sakhibov . F. . Piskunov . A. E. . Kharchenko . N. V. . Bruevich . V. V. . Ezhkova . O. V. . Guslyakova . S. A. . Lang . V. . Shimanovskaya . E. V. . Efremov . Y. N. . A spectral and photometric study of 102 star-forming regions in seven spiral galaxies . Monthly Notices of the Royal Astronomical Society . 11 April 2016 . 457 . 3 . 3334–3355 . 10.1093/mnras/stw212. free . 1601.07470 . 2016MNRAS.457.3334G . 118736701 .
  7. Rahna . P T . Das . M . Murthy . Jayant . Gudennavar . S B . Bubbly . S G . A study of the star forming regions in the spiral galaxy NGC 2336 using the Ultraviolet Imaging Telescope (UVIT) . Monthly Notices of the Royal Astronomical Society . 481 . 1 . 1212 . 17 August 2018 . 10.1093/mnras/sty2250. free . 1803.00506. 2018MNRAS.481.1212R . 118843858 .
  8. Martini . Paul . Regan . Michael W. . Mulchaey . John S. . Pogge . Richard W. . Circumnuclear Dust in Nearby Active and Inactive Galaxies. I. Data . The Astrophysical Journal Supplement Series . June 2003 . 146 . 2 . 353–406 . 10.1086/367817. 2003ApJS..146..353M . astro-ph/0212396 . 15161097 .
  9. Garrido . O. . Marcelin . M. . Amram . P. . GHASP: an Hα kinematic survey of spiral and irregular galaxies – III. 15 new velocity fields and study of 46 rotation curves . Monthly Notices of the Royal Astronomical Society . 21 March 2004 . 349 . 1 . 225–239 . 10.1111/j.1365-2966.2004.07483.x. 2004MNRAS.349..225G . free .
  10. Dong . X. Y. . De Robertis . M. M. . Low-Luminosity Active Galaxies and Their Central Black Holes . The Astronomical Journal . March 2006 . 131 . 3 . 1236–1252 . 10.1086/499334. 2006AJ....131.1236D . astro-ph/0510694 . 17630682 .
  11. Astronomy Magazine, June 1988, pg. 62-63
  12. Web site: IAUC 4441: 1987L; 1987u; 1987 OA. 2021-04-07. www.cbat.eps.harvard.edu.
  13. Web site: Biographies. 2021-04-08. www.physics.purdue.edu.
  14. Pearce . Gillian . Patchett . Bruce . Allington-Smith . Jeremy . Parry . Ian . Observations of the supernova SN1987L with the new Faint Object Spectrograph on the 4.2 m William Herschel Telescope . Astrophysics and Space Science . 1988 . 150 . 2 . 267–271 . 10.1007/BF00641721. 121470638 .
  15. Makarov. Dmitry. Karachentsev. Igor. Galaxy groups and clouds in the local (z~ 0.01) Universe. Monthly Notices of the Royal Astronomical Society. 21 April 2011. 412. 4. 2498–2520. 10.1111/j.1365-2966.2010.18071.x. free . 2011MNRAS.412.2498M. 1011.6277. 119194025.
  16. de Vaucouleurs, G. . de Vaucouleurs, A. . Corwin, J. R. . Second reference catalogue of bright galaxies . Second Reference Catalogue of Bright Galaxies . 1976 . 1976 . 1976RC2...C......0D.

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