NGC 4567 and NGC 4568
Template:Short description Script error: No such module "Infobox".Template:Template otherScript error: No such module "Check for unknown parameters". NGC 4567 and NGC 4568 (nicknamed the Butterfly Galaxies[1] or Siamese Twins[NB 1][2]) are a set of unbarred spiral galaxies about 60 million light-years away[3] in the constellation Virgo. They were both discovered by William Herschel in 1784. They are part of the Virgo Cluster of galaxies.
These galaxies are in the process of colliding and merging with each other, as studies of their distributions of neutral and molecular hydrogen show, with the highest star-formation activity in the part where they overlap. However, the system is still in an early phase of interaction.[4] In about 500 million years the galaxies will coalesce into a single elliptical galaxy.[5]
Supernovae
_(noirlab2219b).jpg){kind=link}
Four supernovae have been observed in the Butterfly Galaxies:
- SN 1990B (type Ib, mag. 16) was discovered by Saul Perlmutter and Carlton Pennypacker on 20 January 1990.[6][7]
- SN 2004cc (type Ic, mag. 17.5) was discovered by the Lick Observatory Supernova Search (LOSS) on 10 June 2004.[8][9]
- SN 2020fqv (type IIb, mag. 19) was discovered by the Automatic Learning for the Rapid Classification of Events (ALeRCE) on 31 March 2020.[10]
- SN 2023ijd (type II, mag. 16.8) was discovered by ASAS-SN on 14 May 2023.[11]
Naming controversy
The two galaxies were nicknamed "Siamese Twins" because they appear to be connected. On August 5, 2020, NASA announced that they would not use that nickname in an effort to avoid systemic discrimination in their terminology.[12][13]
See also
Notes
<templatestyles src="Reflist/styles.css" />
- ↑ Cite error: Script error: No such module "Namespace detect".Script error: No such module "Namespace detect".
Script error: No such module "Check for unknown parameters".
References
<templatestyles src="Reflist/styles.css" />
- ↑ Cite error: Script error: No such module "Namespace detect".Script error: No such module "Namespace detect".
- ↑ Cite error: Script error: No such module "Namespace detect".Script error: No such module "Namespace detect".
- ↑ Cite error: Script error: No such module "Namespace detect".Script error: No such module "Namespace detect".
- ↑ 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 "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".
External links
Template:Sister project Template:Sister project
- Kopernik Space Images, Spiral Galaxies NGC 4568 and NGC 4567 aka "The Siamese Twins" : Supernova 2004cc, George Normandin (29 June 2004)
- Skyhound, The Siamese Twins
- SIMBAD, VCC 1673 : NGC 4567 -- Galaxy in Pair of Galaxies
- SIMBAD, VCC 1676 : NGC 4568 -- Galaxy in Pair of Galaxies
- NED, VV 219
- NED, NGC 4567
- NED, NGC 4568
Template:Catalogs Template:Ngc50 Template:Constellation navbox