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Feeling the Pull: A Study of Natural Galactic Accelerometers. II. Kinematics and Mass of the Delicate Stellar Stream of the Palomar 5 Globular Cluster

  • Authors: Rodrigo A. Ibata, Geraint F. Lewis, Guillaume Thomas, Nicolas F. Martin, and Scott Chapman

2017 The Astrophysical Journal 842 120.

  • Provider: AAS Journals

Caption: Figure 9.

As in Figure 5, but for the RR Lyrae candidate stars from the H16 catalog, selected in the manner described in Figure 8, and that also have a measured radial velocity in either our AAOmega survey (circles) or in the SDSS DR12 (star symbols). As in Figure 8, the color and size of the graph markers denote RR Lyrae probability. We note that the star near ﹩\xi \sim 7\buildrel{\circ}\over{.} 5﹩ was observed by us and by the SDSS at different epochs; the large velocity difference is not unexpected if this object is indeed an RR Lyrae variable. Indeed, bearing in mind the velocity variability of these objects, it is clear that all of these RR Lyrae candidate stars fall in, or close to, the velocity fit from Figure 5.

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