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Journal Article

Loosely coherent search in LIGO O1 data for continuous gravitational waves from Terzan 5 and the galactic center

MPS-Authors
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Dergachev,  Vladimir
Searching for Continuous Gravitational Waves, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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Papa,  Maria Alessandra
Astrophysical and Cosmological Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;

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Steltner,  Benjamin
Searching for Continuous Gravitational Waves, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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Eggenstein,  Heinz-Bernd
Observational Relativity and Cosmology, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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1903.02389.pdf
(Preprint), 2MB

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Citation

Dergachev, V., Papa, M. A., Steltner, B., & Eggenstein, H.-B. (2019). Loosely coherent search in LIGO O1 data for continuous gravitational waves from Terzan 5 and the galactic center. Physical Review D, 99(8): 084048. doi:10.1103/PhysRevD.99.084048.


Cite as: http://hdl.handle.net/21.11116/0000-0003-23E0-8
Abstract
We report results of a search for continuous gravitational waves from a region covering the globular cluster Terzan 5 and the galactic center. Continuous gravitational waves are expected from fast-spinning, slightly non-axisymmetric isolated neutron stars as well as more exotic objects. The regions that we target are believed to be unusually abundant in neutron stars. We use a new loosely coherent search method that allows to reach unprecedented levels of sensitivity for this type of search. The search covers the frequency band 475-1500 Hz and frequency time derivatives in the range of [-3e-8, +1e-9] Hz/s, which is a parameter range not explored before with the depth reached by this search. As to be expected with only a few months of data from the same observing run, it is very difficult to make a confident detection of a continuous signal over such a large parameter space. A list of parameter space points that passed all the thresholds of this search is provided. We follow-up the most significant outlier on the newly released O2 data and cannot confirm it. We provide upper limits on the gravitational wave strength of signals as a function of signal frequency.