NGC 7742
Template:Short description Script error: No such module "Infobox".Template:Template otherScript error: No such module "Check for unknown parameters".
NGC 7742 (also known as the Fried Egg Galaxy) is a face-on unbarred spiral galaxy in the constellation Pegasus. Its velocity with respect to the cosmic microwave background is 1292 ± 26Script error: No such module "String".km/s, which corresponds to a Hubble distance of Script error: No such module "convert"..Template:R In addition, six non-redshift measurements give a farther distance of Script error: No such module "convert"..[1] It was discovered by astronomer William Herschel on 18 Oct 1784.[2]
NGC 7742 is unusual in that it contains a ring but no bar.[3] Typically, bars are needed to produce a ring structure. The bars' gravitational forces move gas to the ends of the bars, where it forms into the rings seen in many barred spiral galaxies. In this galaxy, however, no bar is present, so this mechanism cannot be used to explain the formation of the ring. O. K. Sil'chenko and A. V. Moiseev proposed the ring was formed partly as the result of a merger event in which a smaller gas-rich dwarf galaxy collided with NGC 7742. As evidence for this, they point to the unusually bright central region, the presence of highly inclined central gas disk, and the presence of gas that is counterrotating (or rotating in the opposite direction) with respect to the stars.[3] It is also classified as a Type II Seyfert Galaxy.
Supernovae
Two supernovae have been observed in NGC 7742:
- SNScript error: No such module "String".1993R (typeScript error: No such module "String".II, mag. 17) was discovered by the Leuschner Observatory Supernova Search (LOSS) on 2 June 1993.[4][5]
- SNScript error: No such module "String".2014cy (typeScript error: No such module "String".IIP, mag. 16.2) was discovered by Ken'ichi Nishimura on 31 August 2014.[6][7]
See also
- NGC 7217 – a face-on spiral galaxy with identical characteristics
- Sombrero Galaxy – a similar galaxy with a dust ring
Gallery
-
NGC 7742 (SDSS DR14)
References
<templatestyles src="Reflist/styles.css" />
- ↑ Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1".
- ↑ a b Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "citation/CS1".
Script error: No such module "Check for unknown parameters".