Andromeda XVII: A New Low Luminosity Satellite of M31

Abstract

We report the discovery of a new dwarf spheroidal galaxy near M31 based on INT/WFC imaging. The system, Andromeda XVII (And XVII), is located at a projected radius of ~44 kpc from M31 and 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 colour of the red giant branch implies a metallicity of [Fe/H]~-1.9 and we find an absolute magnitude of M_v~ -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 amongst 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.

5 pages, ApJL acccepted

References in corpus (8)

• The Kinematics of the Ultra-Faint Milky Way Satellites: Solving the Missing Satellite Problem
• Cats and Dogs, Hair and A Hero: A Quintet of New Milky Way Companions
• The Haunted Halos of Andromeda and Triangulum: A panorama of galaxy formation in action
• Discovery and analysis of three faint dwarf galaxies and a globular cluster in the outer halo of the Andromeda galaxy
• ACS photometry of extended, luminous globular clusters in the outskirts of M31
• Discovery of a Faint Old Stellar System at 150 kpc
• Deconstructing dwarf galaxies: a Suprime-Cam survey of Andromeda II
• Wide-field Survey around Local Group Dwarf Spheroidal Galaxy Leo II: Spatial Distribution of Stellar Content

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• A thousand shadows of Andromeda: rotating planes of satellites in the Millennium-II cosmological simulation
• The outer halo globular cluster system of M31 - II. Kinematics
• Discs of Satellites: the new dwarf spheroidals
• Delving Deeper into the Tumultuous Lives of Galactic Dwarfs: Modeling Star Formation Histories
• The Hubble Space Telescope Survey of M31 Satellite Galaxies I. RR Lyrae-based Distances and Refined 3D Geometric Structure
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• The PAndAS View of the Andromeda Satellite System. IV Global properties
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• The Extended Disk Galaxy Exploration Science Survey: Description and Surface Brightness Profile Properties
• The Three Dimensional Structural Shape of the Gravitational Potential in the Local Group
• Galaxies OBserved as Low-luminosity Identified Nebulae (GOBLIN): a catalog of 43,000 high-probability dwarf galaxy candidates in the UNIONS survey