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  Simulation of the white dwarf-white dwarf galactic background in the LISA data

Edlund, J. A., Tinto, M., Krolak, A., & Nelemans, G. (2005). Simulation of the white dwarf-white dwarf galactic background in the LISA data. Classical and Quantum Gravity, 22(18 Sp. Iss. Sp. Iss. SI), S913-S926.

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Edlund, J. A.1, Autor
Tinto, M., Autor
Krolak, Andrzej2, Autor           
Nelemans, G., Autor
Affiliations:
1External Organizations, ou_persistent13              
2Observational Relativity and Cosmology, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, ou_24011              

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 Zusammenfassung: Laser Interferometer Space Antenna (LISA) is a proposed mission to detect and study gravitational radiation in the frequency range from 10-4 to 10-1 Hz. In the low part of its frequency band, the LISA data will contain a stochastic signal consisting of an incoherent superposition of hundreds of millions of gravitational wave signals radiated by inspiraling white-dwarf binaries present in our own galaxy. In order to estimate the LISA response to this background, we have simulated a population of white-dwarf binaries recently synthesized by one of us. Our approach relies on an analytic expressions of the LISA Time-Delay Interferometric responses to the gravitational radiation emitted by such systems, and it allows us to implement a computationally efficient and accurate simulation of the background in the LISA data. We find the amplitude of the galactic white-dwarf binary background in the LISA data to be modulated in time with a period of 1 year, reaching a minimum equal to about twice that of the LISA noise for a period of about 2 months around the time when the Sun–LISA direction is roughly oriented towards the Autumn equinox. This modulation means that the galactic white-dwarf background that will be observable by LISA is a cyclostationary random process with a period of 1 year. We summarize the theory of cyclostationary random processes and present the corresponding generalized spectral method needed to characterize such a process in the LISA data. We find that, by measuring the generalized spectral components of the white-dwarf background, LISA will be able to infer properties of the distribution of the white-dwarf binary systems present in our galaxy.

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Sprache(n): eng - English
 Datum: 2005-09-21
 Publikationsstatus: Erschienen
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 Identifikatoren: eDoc: 251024
ISI: 000232325800006
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Titel: Classical and Quantum Gravity
  Alternativer Titel : Class. Quantum Gravity
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: -
Seiten: - Band / Heft: 22 (18 Sp. Iss. Sp. Iss. SI) Artikelnummer: - Start- / Endseite: S913 - S926 Identifikator: ISSN: 0264-9381