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Post Info TOPIC: Andromeda XXVIII
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Newly found dwarf galaxies could help reveal the nature of dark matter

In work that could help advance astronomers' understanding of dark matter, University of Michigan researchers have discovered two additional dwarf galaxies that appear to be satellites of Andromeda, the closest spiral galaxy to Earth.
Eric Bell, an associate professor in astronomy, and Colin Slater, an astronomy Ph.D. student, found Andromeda XXVIII and XXIX---that's 28 and 29. They did it by using a tested star-counting technique on the newest data from the Sloan Digital Sky Survey, which has mapped more than a third of the night sky. They also used follow-up data from the Gemini North Telescope in Hawaii.
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Title: Andromeda XXVIII: A Dwarf Galaxy More Than 350 kpc from Andromeda Authors: Colin T. Slater, Eric F. Bell, Nicolas F. Martin

 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^{+17}_{-1} kpc, would be one of the most distant of Andromeda's satellites. Its heliocentric distance is 650^{+150}_{-80} kpc, and analysis of its structure and luminosity show that it has an absolute magnitude of M_V = -8.5^{+0.4}_{-1.0} and half-light radius of r_h = 210^{+60}_{-50} 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.

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