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NGC 247

Coordinates: Sky map 00h 47m 08.2851s, −20° 45′ 37.645″
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NGC 247
NGC 247 imaged by the Wide Field Imager (WFI) at ESO's La Silla Observatory in Chile
Observation data (J2000 epoch)
ConstellationCetus
Right ascension00h 47m 08.2851s[1]
Declination−20° 45′ 37.645″[1]
Distance11.1 ± 1.2 Mly
Apparent magnitude (V)9.9[1]
Characteristics
TypeSAB(s)d[1]
Apparent size (V)21.4′ × 6.9′[1] (70,000 light-years in diameter)
Other designations
HIPASS J0047-20, LEDA 2758, ESO-LV 540-0220, IRAS F00446-2101, 2MASX J00470855-2045374, ESO 540-22, IRAS 00446-2101, MCG-04-03-005, GLXY G113.8-83.5+144, KUG 0044-210, UGCA 11, PGC 2758,[1] Caldwell 62

NGC 247 (also known as Caldwell 62 and commonly known as the Claw Galaxy[2]) is an intermediate spiral galaxy about 11.1 Mly away in the constellation Cetus. This distance was confirmed in late February 2011. Previous measurements showed that the galaxy was about 12.2 Mly away, but this was proved to be wrong.[3] NGC 247 is a member of the Sculptor Group, and is 70 000 light years in diameter. [4]

NGC 247 has an unusually large void on one side of its spiral disk. This void contains some older, redder stars but no younger, bluer stars.[5]

Nearby galaxies and galaxy group information

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NGC 247 is one of several galaxies that is gravitationally bound to the Sculptor Galaxy (NGC 253). These galaxies form a small core in the center of the Sculptor Group, which is one of the nearest groups of galaxies to the Milky Way.[6] Most other galaxies associated with the Sculptor Group are only weakly gravitationally bound to this core.[6][7]

Burbidge's Chain

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In 1963, Geoffrey Burbidge and Margaret Burbidge identified a group of five background galaxies located northeast of NGC 247.[8] This grouping came to be known as Burbidge's Chain, and in 1977 it was listed in the VV catalog as VV 518.[9] Individually, the 5 galaxies are also identified as NGC 247A, NGC 247B, NGC 247C, NGC 247D, and ESO 540-025.

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References

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  1. ^ a b c d e f "NASA/IPAC Extragalactic Database". Results for NGC 247. Retrieved 2006-12-19.
  2. ^ Chadwick, Stephen; Cooper, Ian (11 December 2012). Imaging the Southern Sky. Springer. p. 328. ISBN 978-1461447498.
  3. ^ ""eso1107 — Photo Release: The Dusty Disc of NGC 247"". www.eso.org. Retrieved 24 Jul 2022.[1]
  4. ^ "NGC 247, an intermediate spiral galaxy in Cetus". Anne's Astronomy News (in Dutch). 2013-12-05. Retrieved 2020-04-16.
  5. ^ Wagner-Kaiser, R.; Demaio, T.; Sarajedini, A.; Chakrabarti, S. (2014). "The Void in the Sculptor Group Spiral Galaxy NGC 247". Monthly Notices of the Royal Astronomical Society. 443 (4): 3260–3269. arXiv:1407.0584. Bibcode:2014MNRAS.443.3260W. doi:10.1093/mnras/stu1327.
  6. ^ a b Karachentsev, I. D. (2005). "The Local Group and Other Neighboring Galaxy Groups". Astronomical Journal. 129 (1): 178–188. arXiv:astro-ph/0410065. Bibcode:2005AJ....129..178K. doi:10.1086/426368. S2CID 119385141.
  7. ^ Karachentsev, I. D.; Grebel, E. K.; Sharina, M. E.; Dolphin, A. E.; Geisler, D.; Guhathakrta, P.; Hodge, P. W.; Karachentseva, V. E.; Sarajedini, A.; Seitzer, P. (2003). "Distances to nearby galaxies in Sculptor". Astronomy and Astrophysics. 404 (1): 93–111. arXiv:astro-ph/0302045. Bibcode:2003A&A...404...93K. doi:10.1051/0004-6361:20030170. S2CID 54977869.
  8. ^ Burbidge, E. M.; Burbidge, G. R.; Hoyle, F. (1963). "Condensations in the Intergalactic Medium". The Astrophysical Journal. 138: 873. Bibcode:1963ApJ...138..873B. doi:10.1086/147692.
  9. ^ Vorontsov-Velyaminov, B. A. (1977). "Atlas of interacting galaxies, Part II and the concept of fragmentation of galaxies". Astronomy and Astrophysics Supplement Series. 28: 1. Bibcode:1977A&AS...28....1V.
  10. ^ "The centre of NGC 247". www.spacetelescope.org. Retrieved 6 October 2016.
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