Andromeda X, a New Dwarf Spheroidal Satellite of M31: Photometry

We report the discovery of Andromeda X, a new dwarf spheroidal satellite of M31, based on stellar photometry from the Sloan Digital Sky Survey. Using follow-up imaging data we have estimated its distance and other physical properties. We find that Andromeda X has a dereddened central surface brightn...

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Bibliographic Details
Published in:The Astrophysical journal 2007-04, Vol.659 (1), p.L21-L24
Main Authors: Zucker, Daniel B, Kniazev, Alexei Y, Martínez-Delgado, David, Bell, Eric F, Rix, Hans-Walter, Grebel, Eva K, Holtzman, Jon A, Walterbos, Rene A. M, Rockosi, Constance M, York, Donald G, Barentine, J. C, Brewington, Howard, Brinkmann, J, Harvanek, Michael, Kleinman, S. J, Krzesinski, Jurek, Long, Dan, Neilsen, Jr., Eric H, Nitta, Atsuko, Snedden, Stephanie A
Format: Article
Language:English
Subjects:
Astronomy
Earth, ocean, space
Exact sciences and technology
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Summary:We report the discovery of Andromeda X, a new dwarf spheroidal satellite of M31, based on stellar photometry from the Sloan Digital Sky Survey. 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 k sub(v,0) 6 26.7 mag arcsec super(-2) and a total apparent magnitude of V sub(tot) 6 16.1, which at the derived distance modulus, (m - M) sub(0) 6 24.12-24.34, yields an absolute magnitude of M sub(v) 6 -8.1 c 0.5; these values are quite comparable to those of Andromeda IX, a previously discovered low-luminosity M31 satellite. The discoveries of Andromeda X and of numerous other extremely faint satellites around M31 and the Milky Way in the past few years suggest that such objects may be plentiful in the Local Group.
ISSN:1538-4357
0004-637X
1538-4357
DOI:10.1086/516748