Dwingeloo 2
| Galaxy Dwingeloo 2 |
|
|---|---|
|
|
| AladinLite | |
| Constellation | Cassiopeia |
|
Position equinox : J2000.0 , epoch : J2000.0 |
|
| Right ascension | 02 h 54 m 8.47 s |
| declination | + 59 ° 00 ′ 19.1 ″ |
| Appearance | |
| Morphological type | I am |
| Brightness (visual) | 16.21 mag |
| Angular expansion | 2 ′, 0 × 0 ′, 8 |
| Physical data | |
| Affiliation | Maffei group |
| Radial velocity | (94.0 ± 1.5) km / s |
| distance | 10,000,000 ly / 3,000,000 pc |
| history | |
| Discovery date | 1996 |
| Catalog names | |
| PGC 101304 • CAS 2 | |
Dwingeloo 2 is an irregular dwarf galaxy in a distance of about 10 million light-years of our solar system and was in the year 1996 in the screening of dwingeloo Obscured Galaxy Survey discovered (DOGS). The galaxy is located in the constellation of Cassiopeia and lies in the middle of the Galactic Plain in the so-called Zone of Avoidance of the Milky Way , known for covering the background with a large number of stars and interstellar dust. It is a satellite galaxy of Dwingeloo 1 .
properties
Dwingeloo 2 was initially identified in the course of a follow-up investigation after the discovery of Dwingeloo 1 within radio astronomy by its radio emission of the 21 cm emission line of the neutral hydrogen gas .
The galaxy is a member of the Maffei group , a galaxy group in the immediate vicinity of our local group . and moves away from our Milky with a speed of about 241 k m / s .
The apparent visible radius of Dwingeloo 2 is about 2 arc minutes , which corresponds to an absolute 2 kpc at a distance of 3 M pc .
Dwingeloo 2 has a clearly defined rotating disk of neutral hydrogen gas with an inclination of about 69 ° in relation to the direction of observation. The distribution is relatively uneven and lies at a distance of 3.2 kpc from the center of your galaxy. The estimated total mass within this distance is 2.3 billion M ☉ , the mass of the gas alone is an estimated 100 million M ☉ . This means that the total mass of Dwingeloo 2 is a factor of 5 smaller than that of Dwingeloo 1 .
The irregular structure of Dwingeloo 2 is most likely caused by the interaction with its much larger neighboring galaxy Dwingeloo 1 , which is only 24 kpc away from it.
See also
Individual evidence
- ↑ a b c d e NASA / IPAC Extragalactic Database . In: Results for Dwingeloo 2 . Retrieved October 6, 2011.
- ^ Buta, RJ, McCall, ML: "The IC 342 / Maffei Group Revealed" . In: The Astrophysical Journal Supplement Series . 124, 1999, p. 33. doi : 10.1086 / 313255 .
- ↑ a b c d e f W.B. Burton, Verheijen, MAW; Kraan-Korteweg, RC; Henning, PA: Neutral hydrogen in the nearby galaxies Dwingeloo 1 and Dwingeloo 2 . In: Astronomy and Astrophysics . 309, 1996, pp. 687-701. arxiv : astro-ph / 9511020 . bibcode : 1996A & A ... 309..687B .
- ↑ a b Karachentsev, ID: "The Local Group and Other Neighboring Galaxy Groups" . In: The Astronomical Journal . 129, 2005, p. 178. doi : 10.1086 / 426368 .