Andromeda XVII: A new low-luminosity satellite of M31

M. J. Irwin, A. M. N. Ferguson, A. P. Huxor, N. R. Tanvir, R. A. Ibata, G. F. Lewis

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Abstract

We report the discovery of a new dwarf spheroidal galaxy near M31 on the basis of INT/WFC imaging. The system, Andromeda XVII (And XVII), is located at a projected radius of approximate to 44 kpc from M31, has a line-of-sight distance of 794 +/- 40 kpc measured using the tip of the red giant branch, and therefore lies well within the halo of M31. The color of the red giant branch implies a metallicity of [Fe/H] approximate to -1.9, and we find an absolute magnitude of M-V approximate to -8.5. Three globular clusters lie near the main body of And XVII, suggesting a possible association; if any of these are confirmed, it would make And XVII exceptionally unusual among the faint dSph population. The projected position on the sky of And XVII strengthens an intriguing alignment apparent in the satellite system of M31, although with a caveat about biases stemming from the current area surveyed to significant depth.

Original languageEnglish
Pages (from-to)L17-L20
Number of pages4
JournalAstrophysical Journal Letters
Volume676
Issue number1
DOIs
Publication statusPublished - 20 Mar 2008

Keywords

  • galaxies : dwarf
  • galaxies : halos
  • galaxies : individual (M31)
  • globular clusters : general
  • MILKY-WAY SATELLITE
  • SURFACE BRIGHTNESS GALAXIES
  • DWARF SPHEROIDAL SATELLITE
  • RED GIANT BRANCH
  • LOCAL GROUP
  • GLOBULAR-CLUSTERS
  • URSA-MAJOR
  • DISCOVERY
  • FAINT
  • COMPANIONS

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