Dwarf Spheroidal Galaxy Andromeda IX, type dSph,
Discovered in 2004 by Zucker et.al.
- 00 : 52.9
- + 43 : 12
- 2,900 kly
- Apparent Dimension:
- 5 arc min
- 16.2 mag vis
- Abs. Mag:
Andromeda IX is a dwarf spheroidal satellite of the
Andromeda Galaxy, M31; it was discovered in 2004
by resolved stellar photometry from the Sloan Digital Sky Survey (SDSS), by
Zucker et.al. (2004). At the time of its
discovery, it was the galaxy with the lowest known surface brightness, and
the faintest galaxy known from its intrinsic absolute brightness.
Andromeda IX was found from data acquired within an SDSS scan along the major
axis of M31, carried out on October 5, 2002.
Its distance was estimated to be almost exactly the same as that of M31 by
McConnachie et.al. (2005).
The image displayed in this page was taken from the
ING archive from data acquired under the
direction of Nial Tanvir et.al.. Note the very dim luminosity caused by
the stars of this dwarf galaxy and the difficulty to discover it behind the
foreground stars which are all members of the Milky Way galaxy.
- Daniel B. Zucker, Alexei Y. Kniazev, Eric F. Bell,
David Martinez-Delgado, Eva K. Grebel, Hans-Walter Rix, Constance M. Rockosi,
Jon A. Holtzman, Rene A.M. Walterbros, James Annis, Donald G. York,
Zeljko Ivezic, J. Brinkmann, Howard Brewington, Michael Harvanek,
Greg Hennessey, S.J. Kleinman, Jurek Krzesinski, Dan Long, Peter R. Newman,
Atsuko Nitta, and Stephanie A. Snedden, 2004.
Andromeda IX: A New Dwarf Spheroidal Satellite of M31.
The Astrophysical Journal, Vol. 612, Issue 2, pp. L121-L124 (09/2004)
[ADS: 2004ApJ...612L.121Z] --
- A.W. McConnachie, M.J. Irwin, A.M.N. Ferguson,
R.A. Ibata, G.F. Lewis, and N. Tanvir, 2005.
Distances and metallicities for 17 Local Group Galaxies.
Monthly Notices of the Royal Astronomical Society, Vol. 356, Issue 4,
pp. 979-997 (01/2005)
[ADS: 2005MNRAS.356..979M] --
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Last Modification: December 29, 2018