NGC 7793

In the article we present today we will delve into the fascinating world of NGC 7793, exploring its multiple facets and its relevance in today's society. From its origins to its impact today, we will examine in detail how NGC 7793 has played a fundamental role in people's lives, in history, in culture, in the business world, in technology, or in any other field that you can imagine. Through an exhaustive and enriching analysis, we will unravel the most relevant and surprising aspects of NGC 7793, offering our readers a broad and complete vision of this exciting topic.

NGC 7793
Hubble Space Telescope image of the small bulge and spiral arms of NGC 7793
Observation data (J2000 epoch)
ConstellationSculptor
Right ascension23h 57m 49.753s[1]
Declination−32° 35′ 27.71″[1]
Heliocentric radial velocity227 km/s[2]
Distance12.2 Mly (3.7 Mpc)[3]
Group or clusterSculptor Group[4]
Apparent magnitude (V)10.0[5]
Characteristics
TypeSA(s)d[6]
MassStellar: 3.2×109 M☉
Apparent size (V)9.3′ × 6.3′[5] (~30kly in diameter)
Other designations
NGC 7793, PGC 73049[7]

NGC 7793 is a flocculent spiral galaxy in the southern constellation of Sculptor. It was discovered in 1826 by Scottish astronomer James Dunlop.[8] The galaxy is located at a distance of 12.2[3] million light years and is receding with a heliocentric radial velocity of 227 km/s.[2] NGC 7793 is one of the five brightest galaxies within the Sculptor Group.[5][4]

The morphological class of NGC 7793 is SA(s)d,[6] indicating it is unbarred spiral galaxy (SA) with no inner ring structure (s) and the arms are loosely wound and disorganized (d). It is flocculent in appearance with a very small bulge and a star cluster at the nucleus.[5] The galactic disk is inclined at an angle of 53.7° to the line of sight from the Earth. The visible profile is elliptical in form with an angular size of 9.3′ × 6.3′[5] and a major axis aligned along a position angle of 99.3°.[6] There are two nearby dwarf galaxy companions.[9]

On March 25, 2008, a type II-P supernova designated SN 2008bk was discovered in NGC 7793.[10][6] At apparent magnitude 12.5, it became the 2nd brightest supernova of 2008.[11] The progenitor of this supernova was a red supergiant, observed only 547 days prior to the explosion.

NGC 7793 hosts the ultra-luminous X-ray pulsar (ULXP) referred to as NGC 7793 P13 (previously believed to harbor a black hole), which consists of a 0.42-second pulsar in a 64-day orbit with a 18-23 solar mass B9Ia companion star.[12]

  • Visual and infrared image of NGC 7793
    Visual and infrared image of NGC 7793

See also

  • NGC 300 - a similar spiral galaxy that is near NGC 7793
  • NGC 2403 - a similar spiral galaxy

References

  1. ^ a b Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. ^ a b Tully, R. Brent; et al. (August 3, 2016). "Cosmicflows-3". The Astronomical Journal. 152 (2): 50. arXiv:1605.01765. Bibcode:2016AJ....152...50T. doi:10.3847/0004-6256/152/2/50. S2CID 250737862.
  3. ^ a b Lianou, S.; et al. (November 2019). "Dust properties and star formation of approximately a thousand local galaxies". Astronomy & Astrophysics. 631: 19. arXiv:1906.02712. Bibcode:2019A&A...631A..38L. doi:10.1051/0004-6361/201834553. S2CID 174801441. A38.
  4. ^ a b I. D. Karachentsev; E. K. Grebel; M. E. Sharina; A. E. Dolphin; et al. (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.
  5. ^ a b c d e König, Michael; Binnewies, Stefan (2017). The Cambridge Photographic Atlas of Galaxies. Cambridge University Press. p. 68. ISBN 9781108103091.
  6. ^ a b c d Crowther, Paul A. (January 2013). "On the association between core-collapse supernovae and H ii regions". Monthly Notices of the Royal Astronomical Society. 428 (3): 1927–1943. arXiv:1210.1126. Bibcode:2013MNRAS.428.1927C. doi:10.1093/mnras/sts145.
  7. ^ "NASA/IPAC Extragalactic Database". Results for NGC 7793. Retrieved 2006-11-21.
  8. ^ James, Dunlop (1828). "A Catalogue of Nebulae and Clusters of Stars in the Southern Hemisphere observed in New South Wales". Philosophical Transactions of the Royal Society. 118: 113–151. Bibcode:1828RSPT..118..113D. doi:10.1098/rstl.1828.0010. JSTOR 107841.
  9. ^ Mondal, Chayan; et al. (March 2021). "Tracing Young Star-forming Clumps in the Nearby Flocculent Spiral Galaxy NGC 7793 with UVIT Imaging". The Astrophysical Journal. 909 (2): 13. arXiv:2101.11314. Bibcode:2021ApJ...909..203M. doi:10.3847/1538-4357/abe0b4. S2CID 231718940. 203.
  10. ^ David Bishop. "Supernova 2008bk in NGC 7793". supernovae.net (International Supernovae Network). Archived from the original on 2011-09-27. Retrieved 2010-06-07.
  11. ^ David Bishop. "Bright Supernovae - 2008". supernovae.net (International Supernovae Network). Archived from the original on 2011-09-27. Retrieved 2010-06-07.
  12. ^ Israel, G.L. (September 2016). "Discovery of a 0.42-s pulsar in the ultraluminous X-ray source NGC 7793 P13". Monthly Notices of the Royal Astronomical Society: Letters. 466: L48 – L52. arXiv:1609.06538. doi:10.1093/mnrasl/slw218.
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