THE DAWNING OF THE STREAM OF AQUARIUS IN RAVE

We identify a new, nearby (0.5 kpc less than or similar to d less than or similar to 10 kpc) stream in data from the RAdial Velocity Experiment (RAVE). As the majority of stars in the stream lie in the constellation of Aquarius, we name it the Aquarius Stream. We identify 15 members of the stream lying between 30 degrees < l < 75 degrees and -70 degrees < b < -50 degrees, with heliocentric line-of-sight velocities V-los similar to -200 km s(-1). The members are outliers in the radial velocity distribution, and the overdensity is statistically significant when compared to mock samples created with both the Besancon Galaxy model and newly developed code Galaxia. The metallicity distribution function and isochrone fit in the log g-T-eff plane suggest that the stream consists of a 10Gyr old population with [M/H] similar to -1.0. We explore relations to other streams and substructures, finding that the stream cannot be identified with known structures: it is a new, nearby substructure in the Galaxy's halo. Using a simple dynamical model of a dissolving satellite galaxy, we account for the localization of the stream. We find that the stream is dynamically young and therefore likely the debris of a recently disrupted dwarf galaxy or globular cluster. The Aquarius stream is thus a specimen of ongoing hierarchical Galaxy formation, rare for being right in the solar suburb.