The Nature and Orbit of the Ophiuchus Stream
B. Sesar, J. Bovy, E. J. Bernard, N. Caldwell, J. G. Cohen, M., Fouesneau, C. I. Johnson, M. Ness, A. M. N. Ferguson, N. F. Martin, A. M., Price-Whelan, H.-W. Rix, E. F. Schlafly, W. S. Burgett, K. C. Chambers, H., Flewelling, K. W. Hodapp, N. Kaiser, E. A. Magnier, I. Platais

TL;DR
The paper characterizes the Ophiuchus stellar stream in the Milky Way, detailing its kinematics, stellar population, orbit, and origin, revealing it as the remnant of a disrupted globular cluster only about 240 million years ago.
Contribution
It provides the first detailed 6D phase-space model and stellar population analysis of the Ophiuchus stream, confirming its origin from a recently disrupted globular cluster.
Findings
Stream is 7.5-9 kpc from Sun and 50 times longer than wide.
Stream's stellar population is ~12 Gyr old and metal-poor.
Orbit has a period of ~350 Myr with high eccentricity.
Abstract
The Ophiuchus stream is a recently discovered stellar tidal stream in the Milky Way. We present high-quality spectroscopic data for 14 stream member stars obtained using the Keck and MMT telescopes. We confirm the stream as a fast moving ( km s), kinematically cold group ( km s) of -enhanced and metal-poor stars ( dex, dex). Using a probabilistic technique, we model the stream simultaneously in line-of-sight velocity, color-magnitude, coordinate, and proper motion space, and so determine its distribution in 6D phase-space. We find that that the stream extends in distance from 7.5 to 9 kpc from the Sun; it is 50 times longer than wide, merely appearing highly foreshortened in projection. The analysis of the stellar population contained in the stream suggests that it is…
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