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First low frequency all-sky search for continuous gravitational wave signals

Aasi, J., Abbott, B. P., Abbott, R., Abbott, T. D., Abernathy, M. R., Acernese, F., et al. (2016). First low frequency all-sky search for continuous gravitational wave signals. Physical Review D, 93: 042007. doi:10.1103/PhysRevD.93.042007.

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Urheber:
Aasi, J., Autor
Abbott, B. P., Autor
Abbott, R., Autor
Abbott, T. D., Autor
Abernathy, M. R., Autor
Acernese, F., Autor
Ackley, K., Autor
Affeldt, C.1, Autor
Agathos, M., Autor
Agatsuma, K., Autor
Aggarwal, N., Autor
Aguiar, O. D., Autor
Ain, A., Autor
Ajith, P., Autor
Allen, B.2, Autor
Affiliations:
1Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, escidoc:24010
2Observational Relativity and Cosmology, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, escidoc:24011
3Astrophysical and Cosmological Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, escidoc:1933290
4Astrophysical Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, escidoc:24013

### Inhalt

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Schlagwörter: Astrophysics, Instrumentation and Methods for Astrophysics, astro-ph.IM, Astrophysics, High Energy Astrophysical Phenomena, astro-ph.HE,General Relativity and Quantum Cosmology, gr-qc
Zusammenfassung: In this paper we present the results of the first low frequency all-sky search of continuous gravitational wave signals conducted on Virgo VSR2 and VSR4 data. The search covered the full sky, a frequency range between 20 Hz and 128 Hz with a range of spin-down between $-1.0 \times 10^{-10}$ Hz/s and $+1.5 \times 10^{-11}$ Hz/s, and was based on a hierarchical approach. The starting point was a set of short Fast Fourier Transforms (FFT), of length 8192 seconds, built from the calibrated strain data. Aggressive data cleaning, both in the time and frequency domains, has been done in order to remove, as much as possible, the effect of disturbances of instrumental origin. On each dataset a number of candidates has been selected, using the FrequencyHough transform in an incoherent step. Only coincident candidates among VSR2 and VSR4 have been examined in order to strongly reduce the false alarm probability, and the most significant candidates have been selected. The criteria we have used for candidate selection and for the coincidence step greatly reduce the harmful effect of large instrumental artifacts. Selected candidates have been subject to a follow-up by constructing a new set of longer FFTs followed by a further incoherent analysis. No evidence for continuous gravitational wave signals was found, therefore we have set a population-based joint VSR2-VSR4 90$\%$ confidence level upper limit on the dimensionless gravitational wave strain in the frequency range between 20 Hz and 128 Hz. This is the first all-sky search for continuous gravitational waves conducted at frequencies below 50 Hz. We set upper limits in the range between about $10^{-24}$ and $2\times 10^{-23}$ at most frequencies. Our upper limits on signal strain show an improvement of up to a factor of $\sim$2 with respect to the results of previous all-sky searches at frequencies below $80~\mathrm{Hz}$.

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Datum: 2015-10-132016
Publikationsstatus: Im Druck publiziert
Seiten: 27 pages, 19 figures
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Identifikatoren: arXiv: 1510.03621
URI: http://arxiv.org/abs/1510.03621
DOI: 10.1103/PhysRevD.93.042007
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### Quelle 1

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Titel: Physical Review D
Andere : Phys. Rev. D.
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: Lancaster, Pa. : American Physical Society
Seiten: - Band / Heft: 93 Artikelnummer: 042007 Start- / Endseite: - Identifikator: ISSN: 0556-2821
CoNE: http://pubman.mpdl.mpg.de/cone/journals/resource/111088197762258