A panoramic landscape of the Sagittarius stream in Gaia DR2 revealed with the STREAMFINDER spyglass

Understand

We present the first full six-dimensional panoramic portrait of the Sagittarius stream, obtained by searching for wide stellar streams in the Gaia DR2 dataset with the STREAMFINDER algorithm.

• We use the kinematic behavior of the sample to devise a selection of Gaia RR Lyrae, providing excellent distance measurements along the stream.
• The proper motion data are complemented with radial velocities from public surveys.
• We find that the global morphological and kinematic properties of the Sagittarius stream are still reasonably well reproduced by the simple Law & Majewski (2010) model (LM10), although the model overestimates the leading arm and trailing arm distances by up to $\sim 15$%.