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Thanks to modern sky surveys, over twenty stellar streams and overdensitystructures have been discovered in the halo of the Milky Way. In this paper, wepresent an analysis of spectroscopic observations of individual stars from onesuch structure, "A13", first identified as an overdensity using the M giantcatalog from the Two Micron All-Sky Survey. Our spectroscopic observations showthat stars identified with A13 have a velocity dispersion of $\lesssim$ 40$\mathrm{km~s^{-1}}$, implying that it is a genuine coherent structure ratherthan a chance super-position of random halo stars. From its position on thesky, distance ($\sim$15~kpc heliocentric), and kinematical properties, A13 islikely to be an extension of another low Galactic latitude substructure -- theGalactic Anticenter Stellar Structure (also known as the Monoceros Ring) --towards smaller Galactic longitude and farther distance. Furthermore, thekinematics of A13 also connect it with another structure in the southernGalactic hemisphere -- the Triangulum-Andromeda overdensity. We discuss thesethree connected structures within the context of a previously proposed scenariothat one or all of these features originate from the disk of the Milky Way.

Exploring Halo Substructure with Giant Stars. XV. Discovery of a Connection between the Monoceros Ring and the Triangulum-Andromeda Overdensity?