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The >100 kpc Distant Spur of the Sagittarius Stream and the Outer Virgo Overdensity, as Seen in PS1 RR Lyrae Stars

  • Authors: Branimir Sesar, Nina Hernitschek, Marion I. P. Dierickx, Mark A. Fardal, and Hans-Walter Rix

2017 The Astrophysical Journal Letters 844 L4.

  • Provider: AAS Journals

Caption: Figure 4.

Side-by-side comparison of the observed (black points) and simulated Sgr streams (blue and red points; left panels, Fardal et al. 2015; right panels, Dierickx & Loeb 2017). The simulated streams have been offset from their original positions to enable easier comparison (by ﹩{\rm{\Delta }}{\tilde{{\rm{\Lambda }}}}_{\odot }=40^\circ ﹩ and ﹩{\rm{\Delta }}{\tilde{{\rm{\Lambda }}}}_{\odot }=70^\circ ﹩ in the top and bottom panels, respectively). The blue and red points show N-body particles stripped off the Sgr dSph galaxy during pericenter passages that happened about 1.3 and 2.7 Gyr ago, respectively. To mimic the uncertainty in distances to PS1 RRab stars, we have added ﹩0.03\times D﹩ of Gaussian noise to distances of N-body particles.

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