Cannabaceae

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NGC 6781
A Hubble Space Telescope (HST) image of NGC 6782.
Observation data (J2000 epoch)
ConstellationPavo
Right ascension19h 23m 57.935s[1]
Declination−59° 55′ 21.04″[1]
Redshift0.012462±0.000123[2]
Heliocentric 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]

NGC 6782 is a barred spiral galaxy 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]

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]


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See also

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References

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  1. ^ a b c Skrutskie, Michael F.; Cutri, Roc M.; Stiening, Rae; Weinberg, Martin D.; Schneider, Stephen E.; Carpenter, John M.; Beichman, Charles A.; Capps, Richard W.; Chester, Thomas; Elias, Jonathan H.; Huchra, John P.; Liebert, James W.; Lonsdale, Carol J.; Monet, David G.; Price, Stephan; Seitzer, Patrick; Jarrett, Thomas H.; Kirkpatrick, J. Davy; Gizis, John E.; Howard, Elizabeth V.; Evans, Tracey E.; Fowler, John W.; Fullmer, Linda; Hurt, Robert L.; Light, Robert M.; Kopan, Eugene L.; Marsh, Kenneth A.; McCallon, Howard L.; Tam, Robert; Van Dyk, Schuyler D.; Wheelock, Sherry L. (1 February 2006). "The Two Micron All Sky Survey (2MASS)". The Astronomical Journal. 131 (2): 1163–1183. Bibcode:2006AJ....131.1163S. doi:10.1086/498708. ISSN 0004-6256. S2CID 18913331.
  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. ^ a b c 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. S2CID 11672751.
  4. ^ "NASA/IPAC Extragalactic Database". Results for NGC 6782. Retrieved 2007-03-30.
  5. ^ a b c d 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. S2CID 12620956.
  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. ^ a b 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. S2CID 18725775.
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source: https://en.wikipedia.org/wiki/NGC_6782

One thought on “Cannabaceae”

  1. Well, that’s interesting to know that Psilotum nudum are known as whisk ferns. Psilotum nudum is the commoner species of the two. While the P. flaccidum is a rare species and is found in the tropical islands. Both the species are usually epiphytic in habit and grow upon tree ferns. These species may also be terrestrial and grow in humus or in the crevices of the rocks.
    View the detailed Guide of Psilotum nudum: Detailed Study Of Psilotum Nudum (Whisk Fern), Classification, Anatomy, Reproduction

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