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Over the past decade the discovery of three unique stellar populations and alarge number of confirmed pulsars within the globular cluster Terzan 5 hasraised questions over its classification. Using the long-term radio pulsartiming of 36 millisecond pulsars in the cluster core, we provide newmeasurements of key physical properties of the system. As Terzan 5 is locatedwithin the galactic bulge, stellar crowding and reddening make optical and nearinfrared observations difficult. Pulsar accelerations, however, allow us tostudy the intrinsic characteristics of the cluster independent of reddening andstellar crowding and probe the mass density profile without needing to quantifythe mass to light ratio. Relating the spin and orbital periods of each pulsarto the acceleration predicted by a King model, we find a core density of$1.58\times$10$^6$ M$_\odot$ pc$^{-3}$, a core radius of 0.16 pc, a pulsardensity profile $n\propto r^{-3.14}$, and a total mass of M$_{\rmT}$($R_\perp<$1.0 pc)$\simeq3.0\times$10$^5$ M$_\odot$ assuming a clusterdistance of 5.9 kpc. Using this information we argue against Terzan 5 being adisrupted dwarf galaxy and discuss the possibility of Terzan 5 being a fragmentof the Milky Way's proto-bulge. We also discuss whether low-mass pulsars wereformed via electron capture supernovae or exist in a core full of heavy whitedwarfs and hard binaries. Finally we provide an upper limit for the mass of apossible black hole at the core of the cluster of 3.0$\times$10$^4$ M$_\odot$.

Using long-term millisecond pulsar timing to obtain physical characteristics of the bulge globular cluster Terzan 5