Spending too much time at the Galactic bar: chaotic fanning of the Ophiuchus stream

25 Jan 2016 Adrian M. Price-Whelan Branimir Sesar Kathryn V. Johnston Hans-Walter Rix

The Ophiuchus stellar stream is peculiar: (1) its length is short given the age of its constituent stars, and (2) several probable member stars that lie close in both sky position and velocity have dispersions in these dimensions that far exceed those seen within the stream. The stream's proximity to the Galactic center suggests that the bar must have a significant influence on its dynamical history: The triaxiality and time-dependence of the bar may generate chaotic orbits in the vicinity of the stream that can greatly affect its morphology... (read more)

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