PGC 2933

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PGC 2933
PGC 2933.png
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

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]

Contents

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]

References

  1. 1 2 3 4 5 "ESO 540-32". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 28 August 2022.
  2. 1 2 Tully, R. Brent; Courtois, Hélène M.; Sorce, Jenny G. (3 August 2016). "COSMICFLOWS-3". The Astronomical Journal. 152 (2): 50. arXiv: 1605.01765 . Bibcode:2016AJ....152...50T. doi: 10.3847/0004-6256/152/2/50 .
  3. ↑ "ESO 540-32". simbad.u-strasbg.fr. Retrieved 2022-08-28.
  4. ↑ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific . 99 (617): 695. Bibcode:1987PASP...99..695R. doi: 10.1086/132034 . Constellation record for this object at VizieR.
  5. 1 2 3 Jerjen, H.; Rejkuba, M. (2001-05-01). "Tip of the red giant branch distance for the Sculptor group dwarf ESO 540-032". Astronomy & Astrophysics. 371 (2): 487–496. doi:10.1051/0004-6361:20010389. ISSN   0004-6361.
  6. ↑ "Gaia Archive". gea.esac.esa.int. Retrieved 2022-08-28. PGC 2933 resolved by Sesame Strasbourg (Simbad-NED-VizieR) Search PGC 2933
  7. ↑ "The Sculptor Group". www.atlasoftheuniverse.com. Retrieved 2022-08-28. as ESO 540-32 column 7
  8. ↑ "INSPIRE". inspirehep.net. Retrieved 2025-08-01.
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