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A search for pulsars in the central parsecs of the Galactic center

Published online by Cambridge University Press:  20 March 2013

Andrew Siemion
Affiliation:
University of California, Berkeley email: siemion@berkeley.edu
Matthew Bailes
Affiliation:
Swinburne University
Geoff Bower
Affiliation:
University of California, Berkeley email: siemion@berkeley.edu
Jayanth Chennamangalam
Affiliation:
West Virginia University
Jim Cordes
Affiliation:
Cornell University
Paul Demorest
Affiliation:
National Radio Astronomy Observatory
Julia Deneva
Affiliation:
Arecibo Observatory
Gregory Desvignes
Affiliation:
Max Planck Institute for Radio Astronomy
John Ford
Affiliation:
National Radio Astronomy Observatory
Dale Frail
Affiliation:
National Radio Astronomy Observatory
Glenn Jones
Affiliation:
California Institute of Technology
Michael Kramer
Affiliation:
Max Planck Institute for Radio Astronomy
Joseph Lazio
Affiliation:
Jet Propulsion Laboratory
Duncan Lorimer
Affiliation:
West Virginia University
Maura McLaughlin
Affiliation:
West Virginia University
Scott Ransom
Affiliation:
National Radio Astronomy Observatory
Anish Roshi
Affiliation:
National Radio Astronomy Observatory
Mark Wagner
Affiliation:
University of California, Berkeley email: siemion@berkeley.edu
Dan Werthimer
Affiliation:
University of California, Berkeley email: siemion@berkeley.edu
Robert Wharton
Affiliation:
Cornell University
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Abstract

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The discovery of a pulsar or pulsars orbiting near the Galactic Center (GC) could offer an unprecedented probe of strong-field gravity, the properties of our galaxy's supermassive black hole and insights into the paradoxical star formation history of the region. However, searching for pulsars near the GC is severely hampered by the large electron densities along our line of sight and the scattering-induced pulse broadening of the pulsar emission observed through it. As the broadened pulse length approaches the pulsar period, the periodicity in pulsar emission becomes nearly undetectable. Searches extended to higher frequencies, in an effort to reduce scattering, suffer from reduced intrinsic flux, higher system temperatures and increased atmospheric opacity. We are currently attempting to mitigate the challenges associated with searching for pulsars near the GC by employing new wide bandwidth receivers, upgraded IF distribution systems and novel digital spectrometers in a GC pulsar search campaign at the Green Bank Telescope in West Virginia, USA.

Our search will cover two frequency bands, from 12-15 GHz (Ku Band) and 18-26 GHz (K Band), during a total of approximately 30 hours of observations, with expected characteristic 10-sigma sensitivities between 5-10 micro-Jy. Our first observations are scheduled for mid-March 2012. Here we will present the status of our observations and initial results.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2013