Timing of Seven Isolated Pulsars in the Globular Cluster Terzan 1
Justine Singleton, Megan DeCesar, Shi Dai, Deven Bhakta, Scott Ransom,, Jay Strader, Laura Chomiuk, James Miller-Jones

TL;DR
This study presents timing observations of seven isolated pulsars in the globular cluster Terzan 1, providing insights into the cluster's properties and pulsar formation mechanisms through detailed analysis of their spin-down and accelerations.
Contribution
First seven pulsars in Terzan 1 were timed over seven years, revealing their properties and offering new constraints on the cluster's core density and radius.
Findings
All seven pulsars are isolated, consistent with core-collapsed cluster.
Measured period derivatives include intrinsic spin-down and gravitational acceleration effects.
Ter 1 A may be younger than the cluster, suggesting alternative formation channels.
Abstract
Globular clusters host large populations of millisecond pulsars (MSPs) due to their high gravitational encounter rates, producing many binary systems and thus MSPs via the recycling process. Seven pulsars with spin periods ranging from 3 ms to 134 ms have been discovered in Terzan 1, which was targeted for pulsar searches with the Green Bank Telescope after Australia Telescope Compact Array imaging revealed steep-spectrum point sources in the cluster core. We have obtained timing observations over seven years, for the first seven Green Bank Telescope (GBT) discoveries (Terzan 1 A through G), using the GBT and Murriyang, CSIRO's Parkes radio telescope. All seven pulsars are isolated, consistent with Terzan 1's classification as a core-collapsed cluster (core collapse is predicted to disrupt, or ionize, binaries). With these timing solutions, we measured the positions and observed period…
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Taxonomy
TopicsAstrophysical Phenomena and Observations · Pulsars and Gravitational Waves Research · Stellar, planetary, and galactic studies
