Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26as..120c..85b&link_type=abstract
Astronomy and Astrophysics Supplement, v.120, p.85-87
Astronomy and Astrophysics
Astrophysics
7
Methods: Data Analysis, Gamma-Rays:Observations, Stars: Pulsars (General)
Scientific paper
We present a method which can be used to reduce greatly the otherwise prohibitive computation effort needed for gamma-ray pulsar searches. A pulsar's frequency has never been discovered from γ-ray data because of the sparse data and long observation times. The excellent sensitivity of the EGRET instrument on the Compton Gamma Ray Observatory offers a solution. For strong sources, it is possible to split an observation into smaller time intervals and retain a detectable signal. Frequency searches on the separate intervals accumulate fewer trials because the need to search for a frequency derivative can be eliminated. We suggest an `evolutionary' method in which the trials are further reduced by testing data only at those frequencies which have given some indication of periodicity in all previous data intervals. For a typical two-week EGRET dataset, the method reduces the total number of trials by a factor of more than 10^2^ and the computation time by a factor of 10^3^. The evolutionary technique is applied to the now known X-ray and γ-ray pulsar Geminga and is shown to identify the correct spin parameters.
Brazier K. T. S.
Kanbach Gottfried
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