NGC 1808

From Wikipedia, the free encyclopedia
Jump to navigation Jump to search

Template:Short description Template:Sky Template:Infobox Galaxy

NGC 1808 is a barred spiral galaxy[1] located in the southern constellation of Columba, about two degrees to the south and east of Gamma Caeli.[2] It was discovered on 10 May 1826 by Scottish astronomer James Dunlop, who described it as a "faint nebula".[3][4] The galaxy is a member of the NGC 1808 group, which is part of the larger Dorado Group.[3]

The morphological classification of this galaxy is (R)SAB(s)a,[5] which indicates a spiral galaxy with a weak-bar around the nucleus (SAB), no ring around the bar (s), an outer ring (R), and tightly-wound spiral arms (a). It is inclined by an angle of 57° to the line of sight from the Earth, with the long axis oriented at a position angle of 324°.[1] The disk of gas and stars shows a noticeable warp, and there is a pronounced asymmetry in the distribution of neutral hydrogen and H II regions.[6]

File:NGC 1808HSTCenter.jpg
A Hubble Space Telescope image of the center of NGC 1808 (Credit: HST/NASA/ESA)

The core region contains a suspected weak active galactic nucleus plus a circumnuclear ring containing star clusters and supernova remnants at a distance of Script error: No such module "val". from the center. These form a ring of peculiar "hot spots".[7] It was formerly identified as a possible Seyfert galaxy,[1] but evidence now points to starburst activity in a Script error: No such module "val". radius around the center.[8] A probable outflow of gas is directed to the north-east from the nucleus, forming prominent dust lanes.[1] The high level of star formation in this galaxy and the nearby NGC 1792 may indicate a recent, distant tidal interaction between the two.[6]

One supernova has been observed in NGC 1808: SNScript error: No such module "String".1993af (typeScript error: No such module "String".Ia, mag. 17) was discovered by Marina Wischnjewsky on 15 November 1993 at Script error: No such module "val". east and Script error: No such module "val". north of the galactic nucleus.[9][10][11]

Image Gallery

See also

References

<templatestyles src="Reflist/styles.css" />

  1. ↑ a b c d Script error: No such module "Citation/CS1".
  2. ↑ Script error: No such module "citation/CS1".
  3. ↑ a b Script error: No such module "citation/CS1".
  4. ↑ Script error: No such module "citation/CS1".
  5. ↑ Script error: No such module "Citation/CS1".
  6. ↑ a b Script error: No such module "Citation/CS1".
  7. ↑ Script error: No such module "Citation/CS1".
  8. ↑ Script error: No such module "Citation/CS1".
  9. ↑ Script error: No such module "Citation/CS1".
  10. ↑ Script error: No such module "Citation/CS1".
  11. ↑ Script error: No such module "citation/CS1".
  12. ↑ Script error: No such module "citation/CS1".

Cite error: <ref> tag with name "ned" defined in <references> is not used in prior text.
Cite error: <ref> tag with name "Armando2007" defined in <references> is not used in prior text.
Cite error: <ref> tag with name "Tully2016" defined in <references> is not used in prior text.

Cite error: <ref> tag with name "Paturel2003" defined in <references> is not used in prior text.

Script error: No such module "Check for unknown parameters".

External links

Template:Catalogs Template:Ngc20 Template:Columba (constellation)

Retrieved from "http://debianws.lexgopc.com/wiki143/index.php?title=NGC_1808&oldid=4476612"