NGC 7723

Source: Wikipedia, the free encyclopedia.
91.5 ± 10.6 Mly (28.1 ± 3.3 Mpc)[1]
Apparent magnitude (V)11.2[2]
Characteristics
TypeSB(r)b [1]
Apparent size (V)3.5′ × 2.3′[1]
Other designations
MCG -02-60-005, PGC 72009[1]

NGC 7723 is a

light years from Earth, which, given its apparent dimensions, means that NGC 7723 is about 95,000 light years across. It was discovered by William Herschel on November 27, 1785.[3] The galaxy is included in the Herschel 400 Catalogue. It lies 1.5 degrees north-northwest from Omega1 Aquarii. It can be seen with a 4-inch telescope under dark skies.[4]

Characteristics

NGC 7723 is a barred spiral galaxy. It has a bright nucleus and a boxy

Hα there is active star formation at the pseudoring.[9] Based on the B-I color profile of the galaxy the bar finishes at 23 arcseconds, at the same distance where there is a population of older stars, and thus is suggested to be the corotation radius of NGC 7723.[10]

The structure of the

arms is complex. The arm that emanates from the southwest part of the bar is well defined for a quarter of a revolution and after that it becomes more diffuse and fades after reaching half a revolution. The other arm emanates from a feature about 60 degrees northwest of the bar and brightens after passing the end of the bar, and then it splits in two. The inner part forms the southwest part of the pseudoring and bifurcates after winding for about 120 degrees after the bar end, with the inner part being the brightest. The other arm becomes diffuse and of low surface brightness.[5]

One supernova has been observed in NGC 7723, SN 1975N, a type Ia supernova with peak magnitude of 13.8.[11]

Nearby galaxies

NGC 7723 belongs to a small groups of galaxies known as the NGC 7727 group. Other members of the group include NGC 7727 and NGC 7724.[12] NGC 7727 lies about 40' northwest of NGC 7723.[7]

References

  1. ^ a b c d e f g h "NASA/IPAC Extragalactic Database". Results for NGC 7723. Retrieved 2016-01-18.
  2. ^ "Revised NGC Data for NGC 7723". spider.seds.org. Retrieved 25 November 2018.
  3. ^ Seligman, Courtney. "NGC 7723 (= PGC 72009)". Celestial Atlas. Retrieved 19 November 2018.
  4. ISBN 978-0521858939
    .
  5. ^
    S2CID 15491635
    .
  6. S2CID 118989396
    .
  7. ^ a b Sandage, A., Bedke, J. (1994), The Carnegie Atlas of Galaxies. Volume I, Carnegie Institution of Washington
  8. S2CID 119295831
    .
  9. S2CID 56144824
    .
  10. Bibcode:2000A&A...361..841A
    .
  11. IAU
    Central Bureau for Astronomical Telegrams. Retrieved 29 December 2015.
  12. S2CID 119194025. Archived from the original
    on 31 January 2016. Retrieved 29 November 2018.

External links

Wikimedia Commons has media related to NGC 7723.
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