Paper: astro-ph/0601599

Date: Thu, 26 Jan 2006 14:33:59 GMT (519kb)

Title: Andromeda X, A New Dwarf Spheroidal Satellite of M31: Photometry

Authors: Daniel B. Zucker, Alexei Y. Kniazev, David Martinez-Delgado, Eric F.
Bell, Hans-Walter Rix, Eva K. Grebel, Jon A. Holtzman, Rene A. M. Walterbos,
Constance M. Rockosi, Donald G. York, J. C. Barentine, Howard Brewington, J.
Brinkmann, Michael Harvanek, S. J. Kleinman, Jurek Krzesinski, Dan Long, Eric
H. Neilsen, Jr., Atsuko Nitta, Stephanie A. Snedden

Comments: 4 pages, 4 figures; submitted to Astrophysical Journal Letters
\\
We report the discovery of Andromeda X, a new dwarf spheroidal satellite of
M31, based on stellar photometry from the Sloan Digital Sky Survey (SDSS).
Using follow-up imaging data we have estimated its distance and other physical
properties. We find that Andromeda X has a dereddened central surface
brightness of mu_V,0 ~ 26.7 mag arcsec^-2 and a total apparent magnitude of
V_tot ~ 16.1, which at the derived distance modulus, (m - M)_0 ~ 24.12 - 24.34,
yields an absolute magnitude of M_V ~ -8.1 +/- 0.5; these values are quite
comparable to those of Andromeda IX, a previously-discovered low luminosity M31
satellite. The discoveries of Andromeda IX and Andromeda X suggest that such
extremely faint satellites may be plentiful in the Local Group.

\\ ( http://arXiv.org/abs/astro-ph/0601599 , 519kb)