NGC 247

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NGC 247
Wide Field Imager view of the spiral galaxy NGC 247.jpg
NGC 247 imaged by the Wide Field Imager (WFI) at ESO's La Silla Observatory in Chile
Observation data (J2000 epoch)
Constellation Cetus
Right ascension 00h 47m 08.2851s [1]
Declination −20° 45′ 37.645″ [1]
Distance 11.1 ± 1.2 Mly
Apparent magnitude  (V)9.9 [1]
Characteristics
Type SAB(s)d [1]
Size~93,000  ly (28.52  kpc) (estimated) [1]
Apparent size  (V)21.4′ × 6.9′ [1]
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]

Contents

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. [6] [7]

Burbidge's Chain

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.

See also

Related Research Articles

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<span class="mw-page-title-main">Messier 83</span> Barred spiral galaxy in the constellation Hydra

Messier 83 or M83, also known as the Southern Pinwheel Galaxy and NGC 5236, is a barred spiral galaxy approximately 15 million light-years away in the constellation borders of Hydra and Centaurus. Nicolas-Louis de Lacaille discovered M83 on 17 February 1752 at the Cape of Good Hope. Charles Messier added it to his catalogue of nebulous objects in March 1781.

<span class="mw-page-title-main">NGC 300</span> Galaxy in the constellation Sculptor

NGC 300 (also known as Caldwell 70 or the Sculptor Pinwheel Galaxy) is a spiral galaxy in the constellation Sculptor. It was discovered on 5 August 1826 by Scottish astronomer James Dunlop. It is one of the closest galaxies to the Local Group, and it most likely lies between the latter and the Sculptor Group. It is the brightest of the five main spirals in the direction of the Sculptor Group. It is inclined at an angle of 42° when viewed from Earth and shares many characteristics of the Triangulum Galaxy. It is 94,000 light-years in diameter, somewhat smaller than the Milky Way, and has an estimated mass of (2.9 ± 0.2) × 1010M☉.

<span class="mw-page-title-main">NGC 55</span> Galaxy in the constellation Sculptor

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<span class="mw-page-title-main">NGC 404</span> Galaxy in the constellation Andromeda

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<span class="mw-page-title-main">Messier 94</span> Galaxy in the constellation Canes Venatici

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<span class="mw-page-title-main">Centaurus A/M83 Group</span> Group of galaxies in the constellations Centaurus, Hydra and Virgo

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<span class="mw-page-title-main">Sculptor Galaxy</span> Intermediate spiral galaxy in the constellation Sculptor

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<span class="mw-page-title-main">Sculptor Dwarf Irregular Galaxy</span> Irregular galaxy in the constellation Sculptor

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<span class="mw-page-title-main">NGC 6822</span> Galaxy in the constellation Sagittarius

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<span class="mw-page-title-main">NGC 4945</span> Galaxy in the constellation Centaurus

NGC 4945 (also known as Caldwell 83) is a barred spiral galaxy in the constellation Centaurus, visible near the star Xi Centauri. The galaxy was discovered by James Dunlop in 1826 and is thought to be similar to the Milky Way Galaxy, although X-ray observations show that NGC 4945 has an unusual energetic Seyfert 2 nucleus that might house a supermassive black hole. Around the nucleus of the galaxy, there is a dense disk of dust and gas, along with many dense star clusters. This object has an estimated mass of 1.4+1.4
−0.7×1011 M☉.

<span class="mw-page-title-main">Antlia Dwarf</span> Galaxy in the constellation Antlia

The Antlia Dwarf is a dwarf spheroidal/irregular galaxy. It lies about 1.3 Mpc from Earth in the constellation Antlia. It is the fourth and faintest member of the nearby Antlia-Sextans Group of galaxies. The galaxy contains stars of all ages, contains significant amounts of gas, and has experienced recent star formation. The Antlia Dwarf is believed to be tidally interacting with the small barred spiral galaxy NGC 3109.

<span class="mw-page-title-main">NGC 4236</span> Galaxy in the constellation Draco

NGC 4236 is a barred Magellanic spiral galaxy located in the constellation Draco.

<span class="mw-page-title-main">NGC 45</span> Spiral galaxy in the constellation Cetus

NGC 45 is a low surface brightness spiral galaxy in the equatorial constellation of Cetus. It was discovered on 11 November 1835 by the English astronomer John Herschel. The galaxy is located at a distance of 22 million light years and is receding with a heliocentric radial velocity of 466 km/s. It is located in the vicinity of the Sculptor Group, but is most likely a background galaxy.

<span class="mw-page-title-main">NGC 6503</span> Spiral galaxy in the constellation Draco

NGC 6503 is a field dwarf spiral galaxy in the northern constellation of Draco. It was discovered by German astronomer Arthur von Auwers on July 22, 1854. The galaxy has an angular size of 7.1′ × 2.4′ and an apparent visual magnitude of 10.2. It is located at a distance of approximately 20.9 million light-years (6.40 Mpc) from the Milky Way galaxy. NGC 6503 may form the remote tip of a long chain of galaxies that extends out into the local void, forming a galaxy filament spanning 26 million light-years (8 Mpc).

<span class="mw-page-title-main">NGC 3621</span> Spiral galaxy in the constellation Hydra

NGC 3621 is a field spiral galaxy about 22 Mly (6.7 Mpc) away in the equatorial constellation of Hydra. It is comparatively bright and can be well seen in moderate-sized telescopes. The galaxy is around 93,000 ly (29,000 pc) across and is inclined at an angle of 66° from being viewed face on. It shines with a luminosity equal to 13 billion times that of the Sun. The morphological classification is SA(s)d, which indicates this is an ordinary spiral with loosely wound arms. There is no evidence for a bulge. Although it appears to be isolated, NGC 3621 belongs to the Leo spur.

<span class="mw-page-title-main">NGC 615</span> Galaxy in the constellation Cetus

NGC 615 is an unbarred spiral galaxy seen edge-on located in the constellation Cetus. It is located at a distance of circa 70 million light years from Earth, which, given its apparent dimensions, means that NGC 615 is about 75,000 light years across. It was discovered by William Herschel on January 10, 1785. NGC 615 belongs to the NGC 584 galaxy group, which also includes the galaxies NGC 584, NGC 596, NGC 600, and NGC 636.

<span class="mw-page-title-main">NGC 3893</span> Galaxy in the constellation Ursa Major

NGC 3893 is a spiral galaxy located in the constellation Ursa Major. It is located at a distance of circa 50 million light years from Earth, which, given its apparent dimensions, means that NGC 3893 is about 70,000 light years across. It was discovered by William Herschel on February 9, 1788. NGC 3893 interacts with its satellite, NGC 3896.

<span class="mw-page-title-main">NGC 7513</span> Galaxy in the constellation Sculptor

NGC 7513 is a barred spiral galaxy located in the constellation Sculptor. It is located at a distance of circa 62.5 million light years from Earth, which, given its apparent dimensions, means that NGC 7513 is about 75,000 light years across. It was discovered by Albert Marth on September 24, 1864.

<span class="mw-page-title-main">NGC 7172</span> Galaxy in the constellation of Piscis Austrinus

NGC 7172 is a spiral galaxy located in the constellation Piscis Austrinus. It is located at a distance of about 110 million light years from Earth, which, given its apparent dimensions, means that NGC 7172 is about 100,000 light years across. It was discovered by John Herschel on September 23, 1834.

References

  1. 1 2 3 4 5 6 7 "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.
  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. 1 2 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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