Pegasus Dwarf Spheroidal Galaxy

"Andromeda 6" redirects here. For the star, see 6 Andromedae.
Pegasus Dwarf Spheroidal Galaxy
Observation data (J2000 epoch)
Constellation Pegasus
Right ascension 23h 51m 46.3s[1]
Declination +24° 34′ 57″[1]
Redshift −354 ± 3 km/s[1]
Distance 2.7 ± 0.1 Mly (820 ± 20 kpc)[2][3]
Type dSph[2]
Apparent dimensions (V) 4′.0 × 2′.0[1]
Apparent magnitude (V) 14.2[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

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.

Pegasus Dwarf Spheroidal was discovered in 1999[6] by various authors on the Second Palomar 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 = D2
    g     + D2
    c     - 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. Retrieved 2006-11-11.
  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. Bibcode:2006Ap.....49....3K. doi:10.1007/s10511-006-0002-6.
  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. Bibcode:2004AJ....127.2031K. doi:10.1086/382905.
  4. ↑ Van den Bergh, Sidney (May 15, 2000). The Galaxies of the Local Group. Google Books: Cambridge Astrophysics. p. 240. ISBN 0521651816. Retrieved March 21, 2015.
  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. arXiv:astro-ph/0410489. Bibcode:2005MNRAS.356..979M. doi:10.1111/j.1365-2966.2004.08514.x.
  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. arXiv:astro-ph/0501083. Bibcode:2005AJ....129.2232P. doi:10.1086/428372.
  7. ↑ Wallace Sargent. "The Second Palomar Observatory Sky Survey (POSS II)". Caltech.

External links