N11 (emission nebula)

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N11
Emission nebula
superbubble
N11 (Hubble).jpg
A portion of LMC N11, with the NGC 1763 emission nebula at the top and NGC 1761 open cluster at the bottom
Credit: NASA, ESA and Jesús Maíz Apellániz (Instituto de Astrofísica de Andalucía, Spain)
Observation data: J2000.0 epoch
Right ascension 04h 56m 46.2s[1]
Declination−66° 28′ 27″[1]
Distance160,000[2] ly
ConstellationDorado
Physical characteristics
Radius1,000 [3] ly
DesignationsLMC N11, LHA 120-N 11, Bean Nebula
See also: Lists of nebulae
Large Magellanic Cloud with N11 at top left (forming the northwest corner)

N11 (also known as LMC N11, LHA 120-N 11) is the brightest emission nebula in the north-west part of the Large Magellanic Cloud in the Dorado constellation.[3] The N11 complex is the second largest H II region of that galaxy, the largest being the Tarantula Nebula. It covers an area approximately 6 arc minutes across.[4] It has an elliptical shape and consists of a large bubble, generally clear interstellar area, surrounded by nine large nebulae.[5] It was named by Karl Henize in 1956.[6]

When close-up, the nebula has pink clouds of glowing gas which resembles candy floss.[6] It has been well studied over the years and extends 1,000 light-years across.[3]

Its particularly notable features include a huge cavity measuring 80 by 60 pc and a five million year old central cluster (NGC 1761). It is surrounded by several ionized clouds where young O stars are forming.[7][8] Several massive stars are within it, including LH 9, LH 10, LH 13, LH 14. It includes a supernova remnant N11L.[9] In the very centre of NGC 1761 is a bright multiple star HD 32228 which contains a rare blue Wolf-Rayet star, type WC5 or WC6, and an O-type bright giant.[10]

Bean Nebula[edit]

The brightest nebulosity within N11 is the northern region N11B (NGC 1763), also known as the Bean Nebula because of its shape.

Other most notable nebulae[edit]

On N11B's north-east edge is the more compact N11A, known as the Rose Nebula, which has rose-like petals of gas and dust and are illuminated due to the massive hot stars within its centre.[11] It is also known as IC 2116 and was catalogued as a star HD 32340.

The east side of the N11 complex is N11C (NGC 1769), an emission nebula containing at least two compact open clusters.[12]

Outside the main "bubble" of N11 to the northeast is N11E, also known as NGC 1773, a small bright nebula containing several massive young stars. The south portion of the bubble is N11F, also called NGC 1760. The western portion of the bubble is faint and poorly-defined.[5]

To the south-west of N11 is the 7th magnitude red giant HD 31754, a foreground star/star system, lying close to our sightline with open cluster NGC 1733. Three farther galaxies visible from most southern deep space telescopes and observatories are west of N11: the pair PGC 16243 and PGC 16244; and LEDA 89996. To the south of them lie NGC 1731 and TYC 8889-619-1[3] which are part of the galaxy's N4 complex. The bright globular cluster NGC 1783 figures to the north of N11.

References[edit]

  1. ^ a b "NED results for object LMC:N011". NED. Retrieved 5 November 2017.
  2. ^ "A Cauldron of Newborn Stars". Sky and Telescope. 23 July 2010. Retrieved 5 November 2017.
  3. ^ a b c d "N11 complex in LMC". astronomy and observation. Retrieved 5 November 2017.
  4. ^ "Hubble view of the huge star formation region N11 in the Large Magellanic Cloud". Space Telescope. 22 June 2010. Retrieved 5 November 2017.
  5. ^ a b Rosado, M.; Laval, A.; Le Coarer, E.; Georgelin Y., P.; Amram, P.; Marcelin, M.; Goldes, G.; Gach J., L. (1996). "Formation of the nebular complex N11 in the Large Magellanic Cloud". Astronomy and Astrophysics. 308. Bibcode:1996A&A...308..588R.
  6. ^ a b "Hubble captures bubbles and baby stars". Space Telescope. 22 June 2010. Retrieved 5 November 2017.
  7. ^ Nowajewsky, P.; Rubio, M. (2006). "IR Study of N11 in the LMC". Revista Mexicana de Astronomía y Astrofísica (Serie de Conferencias). 26. Bibcode:2006RMxAC..26..162N.
  8. ^ "IR Study of N11 in the LMC". Harvard. Bibcode:2006RMxAC..26..162N.
  9. ^ Naze, Y; Antokhin, I. I; Rauw, G; Chu, Y. -H; Vreux, J. -M; Vreux, J.-M (2004). "XMM-Newton observations of the giant HII region N11 in the LMC". Astronomy & Astrophysics. 418 (3): 841. arXiv:astro-ph/0402623. doi:10.1051/0004-6361:20035633.
  10. ^ "Harry Observes the N11 complex in the LMC". MAAS. 16 November 2016. Retrieved 6 November 2017.
  11. ^ "Hubble Captures Beautiful Baby Stars". Universe Today. 22 June 2010. Retrieved 5 November 2017.
  12. ^ "Hubble Sees Hidden Treasure in Large Magellanic Cloud". NASA. 23 January 2013. Retrieved 6 November 2017.