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Can we see pulsars around Sgr A⋆? The latest searches with the Effelsberg telescope.

Published online by Cambridge University Press:  20 March 2013

R. P. Eatough ,
M. Kramer ,
B. Klein ,
R. Karuppusamy ,
D. J. Champion ,
P. C. C. Freire ,
N. Wex  and
K. Liu
R. P. Eatough
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121, Bonn, Germany email: reatough@mpifr-bonn.mpg.de
M. Kramer
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121, Bonn, Germany email: reatough@mpifr-bonn.mpg.de
B. Klein
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121, Bonn, Germany email: reatough@mpifr-bonn.mpg.de
R. Karuppusamy
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121, Bonn, Germany email: reatough@mpifr-bonn.mpg.de
D. J. Champion
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121, Bonn, Germany email: reatough@mpifr-bonn.mpg.de
P. C. C. Freire
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121, Bonn, Germany email: reatough@mpifr-bonn.mpg.de
N. Wex
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121, Bonn, Germany email: reatough@mpifr-bonn.mpg.de
K. Liu
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121, Bonn, Germany email: reatough@mpifr-bonn.mpg.de
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Abstract

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Radio pulsars in relativistic binary systems are unique tools to study the curved space-time around massive compact objects. The discovery of a pulsar closely orbiting the super-massive black hole at the centre of our Galaxy, Sgr A⋆, would provide a superb test-bed for gravitational physics. To date, the absence of any radio pulsar discoveries within a few arc minutes of Sgr A⋆ has been explained by one principal factor: extreme scattering of radio waves caused by inhomogeneities in the ionized component of the interstellar medium in the central 100 pc around Sgr A⋆. Scattering, which causes temporal broadening of pulses, can only be mitigated by observing at higher frequencies. Here we describe recent searches of the Galactic centre region performed at a frequency of 18.95 GHz with the Effelsberg radio telescope.

Keywords

PulsarsSgr A⋆
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S291: Neutron Stars and Pulsars: Challenges and Opportunities after 80 years , August 2012 , pp. 382 - 384
Copyright
Copyright © International Astronomical Union 2013

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