Andromeda IX: A new dwarf spheroidal satellite of M31

作者：Zucker DB^*; Kniazev AY; Bell EF; Martinez Delgado D; Grebel EK; Rix HW; Rockosi CM; Holtzman JA; Walterbos RAM; Annis J; York DG; Ivezic Z; Brinkmann J; Brewington H; Harvanek M; Hennessy G; Kleinman SJ; Krzesinski J; Long D; Newman PR; Nitta A; Snedden SA

来源：Astrophysical Journal, 2004, 612(2): L121-L124.

DOI：10.1086/424691

• galaxies : dwarf
• galaxies : evolution
• galaxies : individual (Andromeda V, andromeda IX)
• Local Group

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,0) similar to 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) similar to 24.5 (805 kpc), Andromeda IX would also be the faintest galaxy known (M-V similar to - 8.3).

• 出版日期2004-9-10