PGC 2933
Dwarf irregular galaxy
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PGC 2933, also known as LEDA 2933 or ESO 540-032, is a faint dwarf irregular galaxy in the Sculptor Group.[3] It can be seen in the southern constellation Cetus.[4] According to measurements, the galaxy is located 11.15 million light-years away. The stars within ESO 540-032 consist of mostly old red giant branch stars with poor metallicity and young stars with slightly higher metallicity. It may have a large globular cluster (GC) orbiting it.[5]
| PGC 2933 | |
|---|---|
PGC 2933 in a Hubble Space Telescope photo | |
| Observation data (J2000 epoch) | |
| Constellation | Cetus |
| Right ascension | 00h 50m 24.5s[1] |
| Declination | −19° 54′ 23″[1] |
| Redshift | 0.000761[2] |
| Heliocentric radial velocity | 228 km/s[2] |
| Distance | 11.15 |
| Group or cluster | Sculptor Group |
| Apparent magnitude (V) | 16.01[1] |
| Apparent magnitude (B) | 16.63 |
| Characteristics | |
| Type | dG[1] |
| Apparent size (V) | 0.830′ × 0.512′[1] |
| Other designations | |
| ESO 540-32, ESO-LV 540-0320, [FG85] 24, [KK98a] 10, [KK98a] 004756.0-201044, LEDA 2933, PGC 2933 | |
Because it is situated in the Sculptor Group, it is one of the closest galaxies to the Milky Way. It is obscured by a few brighter stars and galaxies (the brightest of them on the right side of the photo is 1425 light-years away from the Solar System).[6] The galaxy has a diameter of 2,000 light years.[7]
Stellar population
The stellar population of this galaxy consist of old metal-poor AGB branch stars with a small population of slightly more metal-rich blue stars with young ages between 150-500 million years old. Theses stars are concentrated in the central regions of the galaxy.[8] It star formation properties are similar to the Fornax dwarf galaxy, a dwarf galaxy in the Fornax constellation.[5]
History
The star formation currently going on in ESO 540-032 likely originated from a single event comparable to the situation seen with the Phoenix dwarf galaxy. In the future, it will likely transition from a dwarf irregular galaxy into a dwarf elliptical galaxy.[5]