In this paper we present the results of a search for members of the globular cluster Palomar 5 and its associated tidal tails .
The analysis has been performed using intermediate and low resolution spectroscopy with the AAOmega spectrograph on the Anglo-Australian Telescope .
Based on kinematics , line strength and photometric information , we identify 39 new red giant branch stars along \sim 20 ^ { \circ } of the tails , a larger angular extent than has been previously studied .
We also recover eight previously known tidal tail members .
Within the cluster , we find seven new red giant and one blue horizontal branch members and confirm a further twelve known red giant members .
In total , we provide velocity data for 67 stars in the cluster and the tidal tails .
Using a maximum likelihood technique , we derive a radial velocity for Pal 5 of -57.4 \pm 0.3 km s ^ { -1 } and a velocity dispersion of 1.2 \pm 0.3 km s ^ { -1 } .
We confirm and extend the linear velocity gradient along the tails of 1.0 \pm 0.1 km s ^ { -1 } deg ^ { -1 } , with an associated intrinsic velocity dispersion of 2.1 \pm 0.4 km s ^ { -1 } .
Neither the velocity gradient nor the dispersion change in any significant way with angular distance from the cluster , although there is some indication that the gradient may be smaller at greater angular distances in the trailing tail .
Our results verify the tails as kinematically cold structures and will allow further constraints to be placed on the orbit of Pal 5 , ultimately permitting a greater understanding of the shape and extent of the Galaxy ’ s dark matter halo .