astro.wikisort.org - Galaxy

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
Observation data (J2000 epoch)
Constellation	Cassiopeia
Right ascension	02h 54m 08.47s[1]
Declination	+59° 00′ 19.1″[1]
Helio radial velocity	94 ± 1.5 km/s[2]
Galactocentric velocity	241 km/s[2]
Distance	~10 Mly (3 Mpc)[3]
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 was first detected at radio wavelengths from the 21 cm emission line of neutral atomic hydrogen (known to astronomers as HI) in the course of follow-up observations after the discovery of Dwingeloo 1.[2] Dwingeloo 2 is thought to be a member of the IC 342/Maffei Group, a galaxy group adjacent to the Local Group.[3] The galaxy recedes from the Milky Way at the speed of about 241 km/s.[2]

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 about 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

External links

• "Dwingeloo 2". SIMBAD. Centre de données astronomiques de Strasbourg.

На других языках

---

[de] Dwingeloo 2

Dwingeloo 2 ist eine irreguläre Zwerggalaxie in einer Entfernung von etwa 10 Millionen Lichtjahren von unserem Sonnensystem und wurde im Jahr 1996 bei der Durchmusterung des Dwingeloo Obscured Galaxy Survey (DOGS) entdeckt. Die Galaxie befindet sich im Sternbild der Kassiopeia und liegt inmitten der Galaktischen Ebene in der sogenannten Zone of Avoidance der Milchstraße, bekannt dafür den Hintergrund durch eine hohe Zahl an Sternen und interstellaren Staub zu verdecken. Sie ist eine Satellitengalaxie von Dwingeloo 1.[3]

---

- [en] Dwingeloo 2

---

[es] Dwingeloo 2

Dwingeloo 2 es una pequeña galaxia irregular a unos 10 millones de años luz de la Tierra en la constelación de Casiopea. Se encuentra cerca del plano de la Vía Láctea y su observación se ve dificultada por el polvo y las estrellas del plano ecuatorial de nuestra galaxia. Es galaxia satélite de Dwingeloo 1, y ambas pertenecen al Grupo Maffei 1, grupo de galaxias contiguo al Grupo Local.

---

[ru] Dwingeloo 2

Dwingeloo 2 — маленькая неправильная галактика, открытая в 1996 году и расположенная на расстоянии около 10 миллионов световых лет от Солнца. Галактика была открыта в рамках проекта DOGS (англ. Dwingeloo Obscured Galaxy Survey) при исследовании зоны избегания. Dwingeloo 2 является галактикой-спутником Dwingeloo 1.[5]

---

---