Astronomy:Pegasus Dwarf Spheroidal Galaxy

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Short description: Dwarf spheroidal galaxy in the constellation Pegasus
Pegasus Dwarf Spheroidal Galaxy
Hubble Space Telescope image of Pegasus Dwarf Spheroidal Galaxy
Observation data (J2000 epoch)
ConstellationPegasus
Right ascension 23h 51m 46.3s[1]
Declination+24° 34′ 57″[1]
Redshift−354 ± 3 km/s[1]
Distance2.7 ± 0.1 Mly (820 ± 20 kpc)[2][3]
Apparent magnitude (V)14.2[1]
Characteristics
TypedSph[2]
Apparent size (V)4.0′ × 2.0′[1]
Notable features-
Other designations
Pegasus II,[1] Andromeda VI,[1] Peg dSph,[1] KKH 99,[1] PGC 2807158

The Pegasus Dwarf Spheroidal (also known as Andromeda VI or Peg dSph for short) is a dwarf spheroidal galaxy about 2.7 million light-years away in the constellation Pegasus. The Pegasus Dwarf is a member of the Local Group and a satellite galaxy of the Andromeda Galaxy (M31).

General information

The Pegasus Dwarf Spheroidal is a galaxy with mainly metal-poor stellar populations.[4] Its metallicity is [Fe/H] ≃ −1.3.[5] It is located at the right ascension 23h51m46.30s and declination +24d34m57.0s in the equatorial coordinate system (epoch J2000.0), and in a distance of 820 ± 20 kpc from Earth and a distance of 294 ± 8 kpc[a] from the Andromeda Galaxy.

The galaxy was discovered in 1999[6] by various authors on the Second Palomar Observatory Sky Survey (POSS II) films.[7]

See also

Notes

  1. ^ For an angular distance θ between C and G, their mutual linear distance R is given by:
          R2 = D2g + D2c - 2 × Dg × Dc × cos(θ)[2]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 "NASA/IPAC Extragalactic Database". Results for Pegasus Dwarf Spheroidal. http://nedwww.ipac.caltech.edu/. 
  2. ↑ 2.0 2.1 2.2 Karachentsev, I. D.; Kashibadze, O. G. (2006). "Masses of the local group and of the M81 group estimated from distortions in the local velocity field". Astrophysics 49 (1): 3–18. doi:10.1007/s10511-006-0002-6. Bibcode: 2006Ap.....49....3K. 
  3. ↑ I. D. Karachentsev; V. E. Karachentseva; W. K. Hutchmeier; D. I. Makarov (2004). "A Catalog of Neighboring Galaxies". Astronomical Journal 127 (4): 2031–2068. doi:10.1086/382905. Bibcode: 2004AJ....127.2031K. 
  4. ↑ Van den Bergh, Sidney (May 15, 2000). The Galaxies of the Local Group. Cambridge Astrophysics. p. 240. ISBN 978-1-139-42965-8. https://books.google.com/books?id=H0JMeoqFqEcC&pg=PA240. 
  5. ↑ McConnachie, A. W.; Irwin, M. J.; Ferguson, A. M. N.; Ibata, R. A.; Lewis, G. F.; Tanvir, N. (2005). "Distances and metallicities for 17 Local Group galaxies". Monthly Notices of the Royal Astronomical Society 356 (4): 979–997. doi:10.1111/j.1365-2966.2004.08514.x. Bibcode: 2005MNRAS.356..979M. 
  6. ↑ Pritzl, Barton J.; Armandroff, Taft E.; Jacoby, George H.; Da Costa, G. S. (May 2005). "The Dwarf Spheroidal Companions to M31: Variable Stars in Andromeda I and Andromeda III". The Astronomical Journal 129 (5): 2232–2256. doi:10.1086/428372. Bibcode: 2005AJ....129.2232P. 
  7. ↑ Wallace Sargent. "The Second Palomar Observatory Sky Survey (POSS II)". Caltech. http://www.astro.caltech.edu/~wws/poss2.html. 



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