Sliding coherence window technique for hierarchical detection of continuous gravitational waves

Abstract

A novel hierarchical search technique is presented for all-sky surveys for continuous gravitational-wave sources, such as rapidly spinning nonaxisymmetric neutron stars. Analyzing yearlong detector data sets over realistic ranges of parameter space using fully coherent matched-filtering is computationally prohibitive. Thus more efficient, so-called hierarchical techniques are essential. Traditionally, the standard hierarchical approach consists of dividing the data into nonoverlapping segments of which each is coherently analyzed and subsequently the matched-filter outputs from all segments are combined incoherently. The present work proposes to break the data into subsegments shorter than the desired maximum coherence time span (size of the coherence window). Then matched-filter outputs from the different subsegments are efficiently combined by sliding the coherence window in time: Subsegments whose timestamps are closer than coherence window size are combined coherently, otherwise incoherently. Compared to the standard scheme at the same coherence time baseline, data sets longer by about 50-100% would have to be analyzed to achieve the same search sensitivity as with the sliding coherence window approach. Numerical simulations attest to the analytically estimated improvement.

11 pages, 4 figures

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• Binary Millisecond Pulsar Discovery via Gamma-Ray Pulsations
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• Estimating the sensitivity of wide-parameter-space searches for gravitational-wave pulsars
• The Einstein@Home search for radio pulsars and PSR J2007+2722 discovery
• Search for Continuous Gravitational Waves: Optimal StackSlide method at fixed computing cost
• PSR J1838-0537: Discovery of a young, energetic gamma-ray pulsar
• First all-sky search for continuous gravitational-wave signals from unknown neutron stars in binary systems using Advanced LIGO data
• Einstein@Home Discovery of a PALFA Millisecond Pulsar in an Eccentric Binary Orbit
• BinarySkyHough: a new method to search for continuous gravitational waves from unknown neutron stars in binary systems
• Spherical ansatz for parameter-space metrics
• Effects of proper motion of neutron stars on continuous gravitational-wave searches
• Constraining the ellipticity and frequency of binary neutron star remnant via its gravitational-wave and electromagnetic radiations
• An improved, "phase-relaxed" F-statistic for gravitational-wave data analysis
• Einstein@Home Searches for Gamma-ray Pulsars in the Inner Galaxy