Long-Term Timing of Pulsars in NGC 6440: An Updated Mass Limit of Millisecond Pulsar J1748-2021B

Nick Clifford
After 11 years of continued observations with the Green Bank Telescope (GBT), we present updated timing solutions of 6 previously published pulsars in NGC 6440. We obtain improvements in timing parameters that allow us to better describe the dynamics of the cluster, such as measure the proper motion of the pulsars and and estimate the cluster’s motion (μα=−1.04(20) mas yr−1, μδ=−3.0(2.5) mas yr−1). Using additional observing bandwidth, we measure the flux densities and spectral indices...
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