Dwingeloo 2
![Sky map](http://upload.wikimedia.org/wikipedia/commons/thumb/e/e4/Jupiter_and_moon.png/20px-Jupiter_and_moon.png)
Dwingeloo 2 | |
---|---|
Observation data ( | |
Group or cluster | IC 342/Maffei |
Apparent magnitude (V) | 16.21 (V-band)[4] |
Characteristics | |
Type | IAm |
Apparent size (V) | 2' × 0'.8[1] |
Notable features | Companion of Dwingeloo 1 |
Other designations | |
PGC 101304[1] |
Dwingeloo 2 is a small irregular galaxy discovered in 1996 and located about 10 million light-years away from the Earth. Its discovery was a result of the Dwingeloo Obscured Galaxy Survey (DOGS) of the Zone of Avoidance using the Dwingeloo Radio Observatory. Dwingeloo 2 is a companion galaxy of Dwingeloo 1.[2]
Dwingeloo 2 was first detected at
The visible radius of Dwingeloo 2 is approximately 2′, which at the distance of 3 Mpc corresponds to about 2 kpc.[1] Dwingeloo 2 has a well defined rotating HI disk inclined at approximately 69° with respect to observer. The distribution of the neutral hydrogen in Dwingeloo 2 is quite irregular, and it is detected as far as 3.2 kpc from the center of the galaxy. The total mass of the galaxy within this radius is estimated at 2.3 billion Solar masses, while the mass of the neutral hydrogen is estimated at 100 million Solar masses. The total mass of the galaxy is about five times less than that of Dwingeloo 1.[2]
The irregular structure of Dwingeloo 2 is likely related to its interaction with the much larger nearby galaxy Dwingeloo 1, which lies at a distance of only 24 kpc from Dwingeloo 2.[2]
References
- ^ a b c d e "Results for Dwingeloo 2". NASA/IPAC Extragalactic Database. Retrieved 2011-10-06.
- ^ Bibcode:1996A&A...309..687B.
- ^ S2CID 119385141.
- doi:10.1086/313255.