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Millisecond Pulsars in the Galactic Bulge? An Extended Discussion on the Wavelet Analysis of the Fermi-LAT data

Published online by Cambridge University Press:  09 February 2017

Richard Bartels  and
Christoph Weniger
Richard Bartels
Affiliation:
GRAPPA Institute, University of Amsterdam, Science Park 904, 1090 GL Amsterdam, Netherlands email: r.t.bartels@uva.nl and c.weniger@uva.nl
Christoph Weniger
Affiliation:
GRAPPA Institute, University of Amsterdam, Science Park 904, 1090 GL Amsterdam, Netherlands email: r.t.bartels@uva.nl and c.weniger@uva.nl
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Abstract

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A clear excess in the Fermi-LAT data is present at energies around a few GeV. The spectrum of this so-called ’GeV excess’ is remarkably similar to the expected annihilation signal of WIMP dark matter. However, a large bulge population of millisecond pulsars living below the Fermi–LAT detection threshold could also explain the excess spectrum. In a recent work we optimized the search for sub-threshold sources, by applying a wavelet transform to the Fermi–LAT gamma-ray data. In the Inner-Galaxy the wavelet signal is significantly enhanced, providing supportive evidence for the point source interpretation of the excess. In these proceedings we will extent our previous work with a spectral analysis and elaborate on the potential contamination from substructures in the gas.

Keywords

gamma–rayspulsars: generalGalaxy: bulgeGalaxy: center
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Symposium S322: The Multi-Messenger Astrophysics of the Galactic Centre , July 2016 , pp. 193 - 196
Copyright
Copyright © International Astronomical Union 2017 

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