Forward and back: kinematics of the Palomar 5 tidal tails

ABSTRACT The tidal tails of Palomar 5 (Pal 5) have been the focus many spectroscopic studies in an attempt to identify individual stars lying along stream and characterize their kinematics. well-studied trailing tail has explored out a distance 15? from cluster centre, while less than 4° examined leading tail. In this paper, we present results study two fields that observed with AAOmega spectrograph on Anglo-Australian telescope. One these lies roughly 7? tail, beyond what previously spectroscopically. Combining our measurements kinematics line strengths Pan-STARRS1 photometric data Gaia EDR3 astrometry, adopt probabilistic approach 16 high probability belonging Pal stream. Eight lie outermost field sky positions confirm presence ‘fanning’ arm. We also revisit published radial velocity incorporate astrometry remove interloping stars. With final sample 109 bona fide stars, 3D full extent system. provide catalogue for future modeling work.