Pegasus Dwarf Spheroidal Galaxy

Infobox Galaxy
name = Pegasus Dwarf Spheroidal Galaxy


caption =
type = dSphcite journal
author=Karachentsev, I. D.; Kashibadze, O. G.
title=Masses of the local group and of the M81 group estimated from distortions in the local velocity field
journal=Astrophysics
year=2006
volume=49
issue=1
pages=3–18
url=http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=2006Ap.....49....3K | doi=10.1007/s10511-006-0002-6]
epoch = J2000
ra = RA|23|51|46.3cite web
title=NASA/IPAC Extragalactic Database
work=Results for Pegasus Dwarf Spheroidal
url=http://nedwww.ipac.caltech.edu/
accessdate=2006-11-11]
dec = DEC|+24|34|57
dist_ly = 2.7 ± 0.1 Mly (820 ± 20 kpc)cite journal
author=I. D. Karachentsev, V. E. Karachentseva, W. K. Hutchmeier, D. I. Makarov
title=A Catalog of Neighboring Galaxies
journal=Astronomical Journal
year=2004
volume=127
pages=2031–2068
url=http://adsabs.harvard.edu/abs/2004AJ....127.2031K | doi=10.1086/382905]
z = -354 ± 3 km/s
appmag_v = 14.2
size_v = 4′.0 × 2′.0
constellation name = Pegasus
notes = -
names = Pegasus II, Andromeda VI, Peg dSph, KKH 99

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 of galaxies and a satellite galaxy of the Andromeda Galaxy (M31).

General information

Pegasus Dwarf Spheroidal is a galaxy with mainly metal-poor stellar populations.Fact|date=February 2007 Its metallicity is [Fe/H] ≃ −1.3.cite journal
author=McConnachie, A. W.; Irwin, M. J.; Ferguson, A. M. N.; Ibata, R. A.; Lewis, G. F.; Tanvir, N.
title=Distances and metallicities for 17 Local Group galaxies
journal=Monthly Notices of the Royal Astronomical Society
year=2005
volume=356
issue=4
pages=979–997
url=http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=2005MNRAS.356..979M | doi=10.1111/j.1365-2966.2004.08514.x] 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 kpcRef_label|A|a|none from the Andromeda Galaxy.

Pegasus Dwarf Spheroidal was discovered in 1999citation
url = http://adsabs.harvard.edu/abs/2005AJ....129.2232P
title = The Dwarf Spheroidal Companions to M31: Variable Stars in Andromeda I and Andromeda III
authors = Pritzl, Barton J.; Armandroff, Taft E.; Jacoby, George H.; Da Costa, G. S.
year = 2005
date = May 2005
journal = The Astronomical Journal
volume = 129
issue = 5
pages = 2232–2256
doi = 10.1086/428372] by various authors on the Second Palomar [http://www.astro.caltech.edu/~wws/poss2.html Sky Survey (POSS-II)] films.

Other resources

External links

* [http://nedwww.ipac.caltech.edu/cgi-bin/nph-objsearch?objname=pegasus+dwarf+spheroidal NASA/IPAC Extragalactic Database: "Pegasus Dwarf Spheroidal"]
* [http://www.journals.uchicago.edu/AJ/journal/issues/v118n3/990209/990209.html Armandroff, Jacoby, & Davies, "Low Surface Brightness Galaxies around M31", "Astrophys. J." 118, 1220-1229 (1999).]

ee also

* Andromeda's satellite galaxies
* Pegasus Dwarf Irregular Galaxy (Peg DIG)
* Pegasus galaxy, the Stargate Atlantis fictional location (probably the Pegasus Dwarf Irregular Galaxy).

Notes

1. Note_label|A|a|noneFor an angular distance θ between "C" and"G", their mutual linear distance "R" is given by:
   "R"² = "D"sup_sub|2|"g" + "D"sup_sub|2|"c" - 2 × "D"_"g" × "D"_"c" × cos(θ)

References