Andromeda IX: A New Dwarf Spheroidal Satellite of M31
Astrophysics
2011-08-23 v2
Abstract
We report the discovery of a new dwarf spheroidal satellite of M31, Andromeda IX, based on resolved stellar photometry from the Sloan Digital Sky Survey (SDSS). Using both SDSS and public archival data we have estimated its distance and other physical properties, and compared these to the properties of a previously known dwarf spheroidal companion, Andromeda V, also observed by SDSS. Andromeda IX is the lowest surface brightness galaxy found to date (mu_{V} ~ 26.8 mag arcsec^-2), and at the distance we estimate from the position of the tip of Andromeda IX's red giant branch, (m - M)_{0} ~ 24.5 (805 kpc), Andromeda IX would also be the faintest galaxy known (M_{V} ~ -8.3).
Keywords
Cite
@article{arxiv.astro-ph/0404268,
title = {Andromeda IX: A New Dwarf Spheroidal Satellite of M31},
author = {Daniel B. Zucker and Alexei Y. Kniazev and Eric F. Bell and David Martinez-Delgado and Eva K. Grebel and Hans-Walter Rix and Constance M. Rockosi and Jon A. Holtzman and Rene A. M. Walterbos and James Annis and Donald G. York and Zeljko Ivezic and J. Brinkmann and Howard Brewington and Michael Harvanek and Greg Hennessy and S. J. Kleinman and Jurek Krzesinski and Dan Long and Peter R. Newman and Atsuko Nitta and Stephanie A. Snedden},
journal= {arXiv preprint arXiv:astro-ph/0404268},
year = {2011}
}
Comments
12 pages, 4 figures; ApJ Letters accepted version