Andromeda XXVIII: A Dwarf Galaxy More Than 350 kpc from Andromeda

Abstract

We report the discovery of a new dwarf galaxy, Andromeda XXVIII, using data from the recently-released SDSS DR8. The galaxy is a likely satellite of Andromeda, and, at a separation of $365_{-1}^{+17}$ kpc, would be one of the most distant of Andromeda's satellites. Its heliocentric distance is $650_{-80}^{+150}$ kpc, and analysis of its structure and luminosity show that it has an absolute magnitude of $M_V=-8.5_{-1.0}^{+0.4}$ and half-light radius of $r_h=210_{-50}^{+60}$ pc, similar to many other faint Local Group dwarfs. With presently-available imaging we are unable to determine if there is ongoing or recent star formation, which prevents us from classifying it as a dwarf spheroidal or dwarf irregular.

Accepted to ApJ Letters

References in corpus (9)

• The Dartmouth Stellar Evolution Database
• The Eighth Data Release of the Sloan Digital Sky Survey: First Data from SDSS-III
• Empirical Color Transformations Between SDSS Photometry and Other Photometric Systems
• 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
• Tip of the Red Giant Branch Distances. I. Optimization of a Maximum Likelihood Algorithm
• Light and Motion in SDSS Stripe 82: The Catalogues
• Andromeda XVII: A New Low Luminosity Satellite of M31
• Draco, a flawless dwarf galaxy

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