The Geometry of Sagittarius Stream from Pan-STARRS1 3π RR Lyrae

Hernitschek, Nina; Sesar, Branimir; Rix, Hans-Walter; Cohen, Judith G.

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The Geometry of Sagittarius Stream from Pan-STARRS1 3π RR Lyrae

MPS-Authors

Hernitschek, Nina
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Sesar, Branimir
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Rix, Hans-Walter
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Cohen, Judith G.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

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https://ui.adsabs.harvard.edu/abs/2018pas6.conf...72H
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Citation

Hernitschek, N., Sesar, B., Rix, H.-W., & Cohen, J. G. (2018). The Geometry of Sagittarius Stream from Pan-STARRS1 3π RR Lyrae.

Cite as: https://hdl.handle.net/21.11116/0000-0005-CD4C-0

Abstract

We present an analysis of the Sagittarius (Sgr) stellar stream's 3D geometry, based on the sample of ̃44 000 RR Lyrae (RRab) stars from the Pan-STARRS1 (PS1) 3π survey, extending to ≳120 kpc with a distance precision of ̃ 3%. A projection of RR Lyrae stars within |\tilde{B}|_{☉}<9° of the Sgr stream's orbital plane reveals the morphology of both the leading and the trailing arms at very high contrast. We fit a model for the angular mean distance and line-of-sight depth, resulting in estimates of the mean stream distance precise to ̃1% and resolving the stream's line-of-sight depth. These improved geometric constraints can serve as new restrictions for dynamical stream models.