Arp 299
Encyclopedia
Arp 299 is a set of galaxies approximately 134 million light-year
s away in the constellation
Ursa Major
.
Both of the galaxies involved in the collision are barred irregular galaxies
.
It is not completely clear which object is historically called IC 694. According to some sources, the small appendage more than an arcminute northwest of the main pair is actually IC 694, not the primary (eastern) companion.
The interaction of the two galaxies in Arp 299 produced young powerful starburst regions similar to that seen in II Zw 96. Six supernova
e have been detected in Arp 299 (SN 1992bu, SN 1993G, SN 1998T, SN 1999D were observed in NGC 3690 while SN 1990al and SN 2005U were observed in IC 694).
Light-year
A light-year, also light year or lightyear is a unit of length, equal to just under 10 trillion kilometres...
s away in the constellation
Constellation
In modern astronomy, a constellation is an internationally defined area of the celestial sphere. These areas are grouped around asterisms, patterns formed by prominent stars within apparent proximity to one another on Earth's night sky....
Ursa Major
Ursa Major
Ursa Major , also known as the Great Bear, is a constellation visible throughout the year in most of the northern hemisphere. It can best be seen in April...
.
Both of the galaxies involved in the collision are barred irregular galaxies
Barred irregular galaxy
A barred irregular galaxy is an irregular version of a barred spiral galaxy. Examples include the Large Magellanic Cloud and NGC 6822. Some barred irregular galaxies may actually be dwarf spiral galaxies, which have been distorted into an irregular shape by tidal interactions with a more massive...
.
It is not completely clear which object is historically called IC 694. According to some sources, the small appendage more than an arcminute northwest of the main pair is actually IC 694, not the primary (eastern) companion.
The interaction of the two galaxies in Arp 299 produced young powerful starburst regions similar to that seen in II Zw 96. Six supernova
Supernova
A supernova is a stellar explosion that is more energetic than a nova. It is pronounced with the plural supernovae or supernovas. Supernovae are extremely luminous and cause a burst of radiation that often briefly outshines an entire galaxy, before fading from view over several weeks or months...
e have been detected in Arp 299 (SN 1992bu, SN 1993G, SN 1998T, SN 1999D were observed in NGC 3690 while SN 1990al and SN 2005U were observed in IC 694).