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Paper detail

Spectroscopic Confirmation of the Pisces Overdensity

We present spectroscopic confirmation of the "Pisces Overdensity", also known as "Structure J", a photometric overdensity of RR Lyrae stars discovered by the Sloan Digital Sky Survey (SDSS) at an estimated photometric distance of ~85kpc. We measure radial velocities for 8 RR Lyrae stars within Pisces. We find that 5 of the 8 stars have heliocentric radial velocities within a narrow range of -87 km/s < v < -67 km/s, suggesting that the photometric overdensity is mainly due to a physically associated system, probably a dwarf galaxy or a disrupted galaxy. Two of the remaining 3 stars differ from one another by only 9 km/s, but it would be premature to identify them as a second system.

preprint2009arXivOpen access
Juna A. KollmeierAndrew GouldStephen ShectmanIan B. ThompsonGeorge W. PrestonJoshua D. SimonJeffrey D. CraneŽeljko IvezićBranimir Sesar
astro-ph.COastro-ph.GA
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Juna A. KollmeierAndrew GouldStephen ShectmanIan B. ThompsonGeorge W. PrestonJoshua D. SimonJeffrey D. CraneŽeljko IvezićBranimir Sesar

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