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

Published online by Cambridge University Press:  04 June 2018

A. Ridolfi ,
P. C. C. Freire ,
M. Kramer ,
C. G. Bassa ,
F. Camilo ,
N. D’Amico ,
G. Desvignes ,
C. O. Heinke ,
C. Jordan  and
D. R. Lorimer
...Show all authors
A. Ridolfi
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany email: ridolfi@mpifr-bonn.mpg.de
P. C. C. Freire
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany email: ridolfi@mpifr-bonn.mpg.de
M. Kramer
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany email: ridolfi@mpifr-bonn.mpg.de Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, The University of Manchester, Manchester M13 9PL, UK
C. G. Bassa
Affiliation:
ASTRON, the Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA, Dwingeloo, the Netherlands
F. Camilo
Affiliation:
Square Kilometre Array South Africa, Pinelands, 7405, South Africa
N. D’Amico
Affiliation:
Osservatorio Astronomico di Cagliari, INAF, via della Scienza 5, I-09047 Selargius (CA), Italy Dipartimento di Fisica, Università degli Studi di Cagliari, SP Monserrato-Sestu km 0, 7, 90042 Monserrato (CA), Italy
G. Desvignes
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany email: ridolfi@mpifr-bonn.mpg.de
C. O. Heinke
Affiliation:
Department of Physics, University of Alberta, CCIS 4-183, Edmonton, AB T6G 2E1, Canada
C. Jordan
Affiliation:
Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, The University of Manchester, Manchester M13 9PL, UK
D. R. Lorimer
Affiliation:
Department of Physics and Astronomy, West Virginia University, P.O. Box 6315, Morgantown, WV 26506, USA
A. Lyne
Affiliation:
Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, The University of Manchester, Manchester M13 9PL, UK
R. N. Manchester
Affiliation:
CSIRO Astronomy and Space Science, Australia Telescope National Facility, Box 76, Epping, NSW 1710, Australia
Z. Pan
Affiliation:
National Astronomical Observatories, Chinese Academy of Sciences, A20 Datun Road, Chaoyang District, Beijing 100012, China
J. Sarkissian
Affiliation:
CSIRO Astronomy and Space Science, Parkes Observatory, PO Box 276, Parkes NSW 2870, Australia
P. Torne
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany email: ridolfi@mpifr-bonn.mpg.de Instituto de Radioastronomía Milimétrica, Avda. Divina Pastora 7, Núcleo Central, E-18012 Granada, Spain
M. van den Berg
Affiliation:
Harvard–Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA
A. Venkataraman
Affiliation:
Arecibo Observatory, HC3 Box 53995, Arecibo, PR 00612, USA
N. Wex
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany email: ridolfi@mpifr-bonn.mpg.de
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Abstract

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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.

Keywords

globular clusters: individual (47 Tucanae, M15)pulsars: individual: (PSR J0024–7203C to J0024–7204ab)pulsars: individual: (PSR B2127+11C)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 13 , Symposium S337: Pulsar Astrophysics the Next Fifty Years , September 2017 , pp. 251 - 254
Copyright
Copyright © International Astronomical Union 2018 

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