Timing of millisecond pulsars in NGC\,6752 -- III. On the presence of non-luminous matter in the cluster's core

Document detail

ID

oai:arXiv.org:2407.03271

Topic

Astrophysics - High Energy Astroph...

Author

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.

Year

2024

listing date

9/18/2024

Keywords

millisecond 6752 pulsars

Metrics

Abstract

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 2.56x10^3 M_SUN 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 ~3000M_SUN.

;Comment: Published in ApJ.

Replaced with the final published version

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., 2024, Timing of millisecond pulsars in NGC\,6752 -- III. On the presence of non-luminous matter in the cluster's core