NGC 3783

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NGC 3783
Artist's impression of the surroundings of the supermassive black hole in NGC 3783.jpg
Artist's impression of the surroundings of the supermassive black hole in NGC 3783
Observation data
Right ascension 11h 39m 01.721s[1]
Declination–37° 44′ 18.60″[1]
Redshift0.008506 ± 0.000100[2]
Helio radial velocity+2,817[3] km/s
Distance135.7 e6ly (41.60[4] Mpc)
Group or clusterNGC 3783 group
Apparent magnitude (V)13.43
Apparent size (V)1′.9 × 1′.7[5]
Notable featuresSeyfert 1
See also: Galaxy, List of galaxies
This video shows an artist's impression of the dusty wind emanating from the black hole at the centre of galaxy NGC 3783

NGC 3783 is a barred spiral galaxy located about 135[4] million light years away in the constellation Centaurus.[6] It is inclined by an angle of 23° to the line of sight from the Earth along a position angle of about 163°. The morphological classification of SBa[5] indicates a bar structure across the center (B) and tightly-wound spiral arms (a).[7] Although not shown by this classification, observers note the galaxy has a luminous inner ring surrounding the bar structure. The bright compact nucleus is active and categorized as a Seyfert 1 type. This nucleus is a strong source of X-ray emission and undergoes variations in emission across the electromagnetic spectrum.[5]

The source of the activity in this galaxy is a rapidly rotating supermassive black hole, which is located at the core and is surrounded by an accretion disk of dust.[8] The estimated mass of this black hole is 8.7 million ([8.7 ± 1.1] × 106) times the mass of the Sun.[9] Interferometric observations yield an inner radius of 0.52 ± 0.16 ly (0.16 ± 0.05 pc) for the orbiting torus of dust.[10]

This is a member of a loose association of 47 galaxies known as the NGC 3783 group. Located at a mean distance of 117 million light-years (36 Mpc), the group is centered at coordinates α =  11h 37m 12s, δ = –37° 30′ 57.6″: equivalent to about 870×10^3 ly (267 kpc) from NGC 3783. The NGC 3783 group has a mean velocity of 2,903 ± 26 km/s with respect to the Sun and a velocity dispersion of 190 ± 24 km/s. The diffuse X-ray emission of the group is roughly centered on the galaxy NGC 3783.[11]


  1. ^ a b Skrutskie, M. F.; et al. (February 2006), "The Two Micron All Sky Survey (2MASS)", The Astronomical Journal, 131 (2): 1163–1183, Bibcode:2006AJ....131.1163S, doi:10.1086/498708.
  2. ^ Strauss, Michael A.; et al. (November 1992), "A redshift survey of IRAS galaxies. VII - The infrared and redshift data for the 1.936 Jansky sample", Astrophysical Journal Supplement Series, 83 (1): 29–63, Bibcode:1992ApJS...83...29S, doi:10.1086/191730.
  3. ^ Jones, D. Heath; et al. (October 2009), "The 6dF Galaxy Survey: final redshift release (DR3) and southern large-scale structures", Monthly Notices of the Royal Astronomical Society, 399 (2): 683–698, arXiv:0903.5451, Bibcode:2009MNRAS.399..683J, doi:10.1111/j.1365-2966.2009.15338.x.
  4. ^ a b Pereira-Santaella, Miguel; et al. (December 2010), "The Mid-infrared High-ionization Lines from Active Galactic Nuclei and Star-forming Galaxies", The Astrophysical Journal, 725 (2): 2270–2280, arXiv:1010.5129, Bibcode:2010ApJ...725.2270P, doi:10.1088/0004-637X/725/2/2270.
  5. ^ a b c d García-Barreto, J. A.; et al. (August 1999), "HI spatial distribution in the galaxy NGC 3783", Astronomy and Astrophysics, 348: 685–692, arXiv:astro-ph/9906492, Bibcode:1999A&A...348..685G.
  6. ^ "The active galaxy NGC 3783 in the constellation of Centaurus", European Southern Observatory, June 20, 2013, retrieved 2013-06-29.
  7. ^ Buta, Ronald J.; et al. (2007), Atlas of Galaxies, Cambridge University Press, pp. 13–17, ISBN 978-0521820486.
  8. ^ Brenneman, L. W.; et al. (August 2011), "The Spin of the Supermassive Black Hole in NGC 3783", The Astrophysical Journal, 736 (2): 103, arXiv:1104.1172, Bibcode:2011ApJ...736..103B, doi:10.1088/0004-637X/736/2/103.
  9. ^ Onken, Christopher A.; Peterson, Bradley M. (June 2002), "The Mass of the Central Black Hole in the Seyfert Galaxy NGC 3783", The Astrophysical Journal, 572 (2): 746–752, arXiv:astro-ph/0202382, Bibcode:2002ApJ...572..746O, doi:10.1086/340351.
  10. ^ Weigelt, G.; et al. (May 2012), "VLTI/AMBER observations of the Seyfert nucleus of NGC 3783", Astronomy & Astrophysics, 541: L9, arXiv:1204.6122, Bibcode:2012A&A...541L...9W, doi:10.1051/0004-6361/201219213.
  11. ^ Kilborn, Virginia A.; et al. (September 2006), "Gaseous tidal debris found in the NGC 3783 group", Monthly Notices of the Royal Astronomical Society, 371 (2): 739–749, arXiv:astro-ph/0606463, Bibcode:2006MNRAS.371..739K, doi:10.1111/j.1365-2966.2006.10697.x.

External links[edit]

Coordinates: Sky map 11h 39m 01.721s, −-37° 44′ 18.60″