We present a catalog of spectroscopic redshifts for SPT-CLJ0615 - 5746 , the most distant cluster in the Reionization Lensing Cluster Survey ( RELICS ) .
Using Nod & Shuffle multi-slit observations with LDSS-3 on Magellan , we identify { \sim } 50 cluster members and derive a cluster redshift of z _ { c } = 0.972 , with a velocity dispersion of \sigma = 1235 \pm 170 \textrm { km } \textrm { s } ^ { -1 } .
We calculate a cluster mass using a \sigma _ { 200 } - M _ { 200 } scaling relation of M _ { 200 } = ( 9.4 \pm 3.6 ) \times 10 ^ { 14 } M _ { \odot } , in agreement with previous , independent mass measurements of this cluster .
In addition , we examine the kinematic state of SPT-CLJ0615 - 5746 , taking into consideration prior investigations of this system .
With an elongated profile in lensing mass and X-ray emission , a non-Gaussian velocity dispersion that increases with clustercentric radius , and a brightest cluster galaxy not at rest with the bulk of the system , there are multiple cluster properties that , while not individually compelling , combine to paint a picture that SPT-CLJ0615 - 5746 is currently being assembled .