NGC 6782

NGC 6782 is a barred located in the southern constellation of Pavo, at a distance of approximately 173 megalight-years from the Milky Way.[3] It was discovered on July 12, 1834 by English astronomer John Herschel. John L. E. Dreyer described it as, "considerably faint, considerably small, round, a little brighter middle, 9th magnitude star to south".[7] The morphological classification of NGC 6782 is (R1R′2)SB(r)a, indicating a barred spiral galaxy with a multiple ring system and tightly-wound spiral arms.[5] It is seen nearly face-on,[8] being inclined by an angle of 27.2°±0.2° to the line of sight from the Earth.[5]

NGC 6782
A Hubble Space Telescope (HST) image of NGC 6782.
Credit: HST/NASA/ESA.
Observation data (J2000 epoch)
ConstellationPavo
Right ascension19h 23m 57.935s[1]
Declination−59° 55′ 21.04″[1]
Redshift0.012462±0.000123[2]
Helio radial velocity3,736 km/s[3]
Distance173 Mly (53 Mpc)[3]
Apparent magnitude (V)11.8[4]
Characteristics
Type(R1R′2)SB(r)a[5]
Apparent size (V)1′.197 × 0′.814[1] (NIR)
Other designations
LEDA 63168, ESO 142-1, 2MASX J19235793-5955210, NGC 6782, PGC 63168[6]

At the galactic core is an almost circular nuclear ring at the inner Lindblad resonance. This is attached to the primary bar, which extends out to a somewhat pointy, diamond-shaped inner ring. It is actually a double-barred galaxy, with an interior bar inside the nuclear ring. A pair of faint spiral arms extend out from the inner ring to the outer parts of the galaxy, where it joints a double outer ring system.[5] Both inner rings of the galaxy are undergoing star formation, producing hot OB stars, with little star formation occurring in the remainder.[8]

  • Structure of NGC 6782

See also

References
  1. Skrutskie, M. F.; et al. (February 2006), "The Two Micron All Sky Survey (2MASS)", Astronomical Journal, 131 (2): 1163–1183, Bibcode:2006AJ....131.1163S, doi:10.1086/498708
  2. de Vaucouleurs, G.; et al. (1976). Second Reference Catalog of Bright Galaxies. Austin: University of Texas Press. ISBN 978-0-292-75509-3.
  3. Crook, Aidan C.; et al. (February 2007). "Groups of Galaxies in the Two Micron All Sky Redshift Survey". The Astrophysical Journal. 655 (2): 790–813. arXiv:astro-ph/0610732. Bibcode:2007ApJ...655..790C. doi:10.1086/510201.
  4. "NASA/IPAC Extragalactic Database". Results for NGC 6782. Retrieved 2007-03-30.
  5. Lin, Lien-Hsuan; et al. (September 2008). "Hydrodynamical Simulations of the Barred Spiral Galaxy NGC 6782". The Astrophysical Journal. 684 (2): 1048–1061. arXiv:0805.3613. Bibcode:2008ApJ...684.1048L. doi:10.1086/590247.
  6. "NGC 6782". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-10-06.
  7. Seligman, Courtney. "NGC Objects: NGC 6750 - 6799". Retrieved 2020-10-03.
  8. Eskridge, Paul B.; et al. (April 2003). "Ultraviolet-Optical Pixel Maps of Face-on Spiral Galaxies: Clues for Dynamics and Star Formation Histories". The Astrophysical Journal. 586 (2): 923–938. arXiv:astro-ph/0211494. Bibcode:2003ApJ...586..923E. doi:10.1086/367820.
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