Timing of Millisecond Pulsars in NGC 6752. III. On the Presence of Nonluminous Matter in the Cluster’s Core

• Published in: The Astrophysical journal Vol. 972; no. 2; pp. 198 - 214
• Main Authors: Corongiu, A., Ridolfi, A., Abbate, F., Bailes, M., Possenti, A., Geyer, M., Manchester, R. N., Kramer, M., Freire, P. C. C., Burgay, M., Buchner, S., Camilo, F.
• Format: Journal Article
• Language: English
• Published: The American Astronomical Society 01.09.2024; IOP Publishing
• Subjects: Globular star clusters; Millisecond pulsars; Pulsars
• ISSN: 0004-637X; 1538-4357
• DOI: 10.3847/1538-4357/ad5e74

Millisecond pulsars are subject to accelerations in globular clusters (GCs) that manifest themselves in both the first and second spin period time derivatives, and can be used to explore the mass distribution of the potentials they inhabit. Here we report on over 20 yr of pulsar timing observations of five millisecond radio pulsars in the core of the core-collapse GC NGC 6752 with the Parkes (Murriyang) and MeerKAT radio telescopes, which have allowed us to measure the proper motions, positions, and first and second time derivatives of the pulsars. The pulsar timing parameters indicate that all the pulsars in the core experience accelerations and jerks that can be explained only if an amount of nonluminous mass of at least 2.56 × 10 3 M ⊙ is present in the core of NGC 6752. On the other hand, our studies highly disfavor the presence of an intermediate-mass black hole at the center of the cluster, with a mass equal to or greater than ∼3000 M ⊙ .