Pegasus Dwarf Spheroidal Galaxy

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).

Pegasus Dwarf Spheroidal Galaxy
Hubble Space Telescope image of Pegasus Dwarf Spheroidal Galaxy
Observation data (J2000 epoch)
Constellation	Pegasus
Right ascension	23^h 51^m 46.3^s^[1]
Declination	+24° 34′ 57″^[1]
Redshift	−354 ± 3 km/s^[1]
Distance	2.7 ± 0.1 Mly (820 ± 20 kpc)^[2]^[3]
Apparent magnitude (V)	14.2^[1]
Characteristics
Type	dSph^[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

General information edit

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]

^{^} For an angular distance θ between C and G, their mutual linear distance R is given by:
R² = D²
_g + D²
_c - 2 × D_g × D_c × cos(θ)^[2]

^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ "NASA/IPAC Extragalactic Database". Results for Pegasus Dwarf Spheroidal. Retrieved 2006-11-11.
^ ^a ^b ^c 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. S2CID 120973010.
^ 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.
^ Van den Bergh, Sidney (May 15, 2000). The Galaxies of the Local Group. Cambridge Astrophysics. p. 240. ISBN 978-1-139-42965-8.
^ 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.
^ 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. S2CID 9749493.
^ Wallace Sargent. . Caltech. Archived from the original on 2009-05-16.

NASA/IPAC Extragalactic Database: Pegasus Dwarf Spheroidal
Armandroff, Jacoby, & Davies, "Low Surface Brightness Galaxies around M31", Astrophys. J. 118, 1220-1229 (1999).