Henize 70
Emission nebula
Superbubble
Amateur photograph of Henize 70
Observation data: J2000 epoch
Right ascension05h 43m 17.5s[1]
Declination−67° 50′ 48″[1]
Distance~50,000[2] pc
Apparent dimensions (V)7′ × 8′[3]
ConstellationDorado
Physical characteristics
Dimensions346 × 396[4][lower-alpha 1]
Notable featuresSuperbubble
DesignationsHenize 70,[5] N70,[3] LHA 120-N 70,[3][6] DEM L 301, MCELS L-373[6]

Henize 70 (N70) is a faint[7] emission nebula[8] and superbubble[5][4][9][10] located in the Large Magellanic Cloud. It is located in the constellation of Dorado.

Observation history

Henize 70 was first observed in 1950 in a survey of bright planetary nebulae, based on appearance it was proposed that it might be a supernova remnant.[7] In 1956, it was added to a catalogue of Hα emission stars and nebulae by Karl Gordon Henize, where it was described as an emission nebula instead of a planetary nebula.[8]

Origins

ESO image of Henize 70

In a paper published in 1978, it was proposed that stellar winds could be a major part of the formation of Henize 70 and other emission nebulae.[11] Later, in a scientific article 1981 it was mentioned that it was more likely from a supernova explosion rather than stellar winds.[12] Another study in 2014 measured high SII and Hα ratios, indicating that it is not a supernova remnant.[13]

Henize 70 has spectral line ratios relatively similar to that of supernova remnants due to having similar SII/Hα line ratios although most supernova remnants have higher NII/Hα line ratios.[14]

Notes

  1. ↑ Using angular dimensions of 7’ × 8’ and a distance of ~170 kly.

References

  1. 1 2 Pellegrini, E. W.; Oey, M. S.; Winkler, P. F.; Points, S. D.; Smith, R. C.; Jaskot, A. E.; Zastrow, J. (13 February 2012). "The Optical Depth of H II Regions in the Magellanic Clouds". The Astrophysical Journal. 755 (1): 30. arXiv:1202.3334. Bibcode:2012ApJ...755...40P. doi:10.1088/0004-637X/755/1/40. ISSN 0004-637X. S2CID 51059889.
  2. ↑ Schneiter, E. M.; Reyes-Iturbide, J.; Velàzquez, P. F.; Esquivel, A. (2 February 2022). "X-ray and optical emission from large superbubbles including the stellar photoionization". Monthly Notices of the Royal Astronomical Society. 511 (3): 3420–3427. Bibcode:2022MNRAS.511.3420S. doi:10.1093/mnras/stac292. ISSN 1365-2966.
  3. 1 2 3 Davies, R. D.; Elliott, K. H.; Meaburn, J. (1976). "The nebular complexes of the Large and Small Magellanic Clouds". Memoirs of the Royal Astronomical Society. 81: 89. Bibcode:1976MmRAS..81...89D.
  4. 1 2 "N70. Henize 70". Astrodrudis. Retrieved 14 April 2023.
  5. 1 2 "Henize 70: A SuperBubble In The LMC". Astronomy Picture of the Day. Retrieved 14 April 2023.
  6. 1 2 "LHA 120-N 70". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 14 April 2023.
  7. 1 2 Evans, D. S.; Thackeray, A. D. (1950). "A photographic survey of bright southern planetary nebulae". Monthly Notices of the Royal Astronomical Society. 110 (5): 429–439. Bibcode:1950MNRAS.110..429E. doi:10.1093/mnras/110.5.429. ISSN 1365-2966.
  8. 1 2 Henize, Karl G. (September 1956). "Catalogues of Hα-emission Stars and Nebulae in the Magellanic Clouds". Astrophysical Journal Supplement. 2: 315. Bibcode:1956ApJS....2..315H. doi:10.1086/190025. ISSN 0067-0049.
  9. ↑ "N70 Nebula in the Large Magellanic Cloud". European Southern Observatory. 14 April 2023.
  10. ↑ "Henize 70: A Superbubble in the LMC". NASA. 14 April 2023.
  11. ↑ Meaburn, J. (November 1978). "H I, Molecular/H II Shells from 1 to 2000 pc Diameter: Wind-Driven or Supernova Remnants?". Astrophysics and Space Science. 59 (1): 193–214. Bibcode:1978Ap&SS..59..193M. doi:10.1007/BF00651050. ISSN 1572-946X. S2CID 121072103.
  12. ↑ Rosado, M.; Georgelin, Y. P.; Georgelin, Y. M.; Laval, A.; Monnet, G. (April 1981). "Kinematics of ring-shaped nebulae in the LMC. I - The radial velocity field of N70". Astronomy and Astrophysics. 97 (2): 342–346. Bibcode:1981A&A....97..342R. eISSN 1432-0746. ISSN 0004-6361.
  13. ↑ Zhang, Ning-Xiao; Chu, You-Hua; Williams, R. M.; Jiang, Bing; Chen, Yang; Gruendl, R. A. (24 July 2014). "Physical Nature of the [S II]-bright Shell Nebulae N70 and N185". The Astrophysical Journal. 792 (1): 9. arXiv:1407.6718. Bibcode:2014ApJ...792...58Z. doi:10.1088/0004-637X/792/1/58. ISSN 0004-637X. S2CID 118666688.
  14. ↑ Skelton, Brooke P.; Waller, William H.; Gelderman, Richard F.; Brown, Larry; Woodgate, Bruce; Caulet, Adeline; Schommer, Robert A. (27 February 1999). "Emission-Line Properties of the Large Magellanic Cloud Bubble N70". The Publications of the Astronomical Society of the Pacific. 111 (758): 465–481. arXiv:astro-ph/9903001. Bibcode:1999PASP..111..465S. doi:10.1086/316346. ISSN 1538-3873. S2CID 120179184.
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