NGC 247 explained

NGC 247
Epoch:J2000
Type:SAB(s)d[1]
Dist Ly:11.1 ± 1.2 Mly
Appmag V:9.9
Size V:21.4 × 6.9
Size:~28.52kpc (estimated)
Constellation Name:Cetus
Names: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, 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

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.[7]

Burbidge's Chain

In 1963, Geoffrey Burbidge and Margaret Burbidge identified a group of five background galaxies located northeast of NGC247.[8] This grouping came to be known as Burbidge's Chain, and in 1977 it was listed in the VV catalog as VV518.[9] Individually, the 5 galaxies are also identified as NGC247A, NGC247B, NGC247C, NGC247D, and ESO540-025.

See also

Notes and References

  1. Web site: NASA/IPAC Extragalactic Database . Results for NGC 247 . 2006-12-19.
  2. Book: Chadwick . Stephen . Cooper . Ian . Imaging the Southern Sky . 11 December 2012 . Springer . 978-1461447498 . 328.
  3. Web site: "eso1107 — Photo Release: The Dusty Disc of NGC 247". www.eso.org. 24 Jul 2022. http://www.eso.org/public/news/eso1107/
  4. Web site: NGC 247, an intermediate spiral galaxy in Cetus. 2013-12-05. Anne's Astronomy News . nl-NL. 2020-04-16.
  5. Wagner-Kaiser . R. . Demaio . T. . Sarajedini . A. . Chakrabarti . S. . 2014 . The Void in the Sculptor Group Spiral Galaxy NGC 247 . 1407.0584 . 10.1093/mnras/stu1327 . 443 . 4 . Monthly Notices of the Royal Astronomical Society . 3260–3269. free . 2014MNRAS.443.3260W .
  6. Karachentsev . I. D. . The Local Group and Other Neighboring Galaxy Groups . 2005 . . 129 . 1 . 178–188 . astro-ph/0410065 . 2005AJ....129..178K . 10.1086/426368. 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 . . 404 . 1 . 93–111 . astro-ph/0302045 . 2003A&A...404...93K . 10.1051/0004-6361:20030170. 54977869 .
  8. 1963ApJ...138..873B. Condensations in the Intergalactic Medium. Burbidge. E. M.. Burbidge. G. R.. Hoyle. F.. The Astrophysical Journal. 1963. 138. 873. 10.1086/147692.
  9. 1977A&AS...28....1V. Atlas of interacting galaxies, Part II and the concept of fragmentation of galaxies. Vorontsov-Velyaminov. B. A.. Astronomy and Astrophysics Supplement Series. 1977. 28. 1.

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