Long-term observations of pulsars in the globular clusters 47 Tucanae and M15

Abstract

Multi-decade observing campaigns of the globular clusters 47 Tucanae and M15 have led to an outstanding number of discoveries. Here, we report on the latest results of the long-term observations of the pulsars in these two clusters. For most of the pulsars in 47 Tucanae we have measured, among other things, their higher-order spin period derivatives, which have in turn provided stringent constraints on the physical parameters of the cluster, such as its distance and gravitational potential. For M15, we have studied the relativistic spin precession effect in PSR B2127+11C. We have used full-Stokes observations to model the precession effect, and to constrain the system geometry. We find that the visible beam of the pulsar is swiftly moving away from our line of sight and may very soon become undetectable. On the other hand, we expect to see the opposite emission beam sometime between 2041 and 2053.

arXiv comment4 pages, 1 figure, accepted for publication in the proceedings of IAU Symposium 337 - Pulsar Astrophysics: The Next Fifty Years

References in corpus (6)

• Measurement of Orbital Decay in the Double Neutron Star Binary PSR B2127+11C
• Long-term observations of the pulsars in 47 Tucanae - II. Proper motions, accelerations and jerks
• Long-term observations of the pulsars in 47 Tucanae. I. A study of four elusive binary systems
• The Spectral Energy Distributions of White Dwarfs in 47 Tucanae: The Distance to the Cluster
• The Millisecond Pulsars in NGC 6760
• Discovery of Two New Pulsars in 47 Tucanae (NGC 104)

Cited by in corpus (2)

• FAST Observation and Results for Core Collapse Globular Cluster M15 and NGC 6517
• Search for Periodic Radio Signals from Double Neutron Star System Companions Using the Fast Folding Algorithm