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The Virgo detector now running with its full laser power is going through its final step of commissioning. We report on the last year activities: this includes the commissioning work done to bring the instrument to the target sensitivity after a shutdown period and the data analysis effort to search for the most promising sources of gravitational waves. The data analysis teams are now mainly focusing their effort on real data and have improved their understanding of the interferometer's sources of noise. Finally, we will describe the near-term plans for Virgo upgrades.
The LIGO, GEO and Virgo detectors have collected few years of data at their nominal sensitivities between 2005 and 2011 and are now being upgraded with even better sensitivities. The main sources of gravitational waves falling inside the interferometric detectors' frequency band width are presented along with the observational results obtained so far. Low latency searches and rapid sky localization of transient sources are opening a new era for astrophysics where gravitational waves will provide a unique way to probe the dynamics of the central engines that power many observed electromagnetic transient phenomena. Finally, we review the great potential for astrophysical discoveries and for testing general relativity offered by the second generation of ground based gravitational wave detectors under construction (LIGO, Virgo and KAGRA).
Beaucoup de sources d'ondes gravitationnelles parmi les plus prometteuses n'ont pas de formes d'onde bien modelisees. Il faut donc employer des techniques de recherche robustes qui ne font pas d'hypotheses sur la forme exacte du signal. Une autre difficulte de ce genre de recherches est due aux donnees des detecteurs qui est foncierement non Gaussien et qui comporte une ribambelle de signaux transitoires qui ont les memes characteristiques que le signal recherche. Une facon d'augmenter la significance des candidats est d'utiliser l'information produites par d'autres mechanismes d'emission.
The first generation of ground-based interferometric gravitational wave detectors, LIGO, GEO and Virgo, have operated and taken data at their design sensitivities over the last few years. The data has been examined for the presence of gravitational wave signals. Presented here is a comprehensive review of the most significant results. The network of detectors is currently being upgraded and extended, providing a large likelihood for observations. These future prospects will also be discussed.
Typical sources of gravitational wave bursts are supernovae, for which no accurate models exist. This calls for search methods with high efficiency and robustness to be used in the data analysis of foreseen interferometric detectors. A set of such filters is designed to detect gravitational wave burst signals. We first present filters based on the linear fit of whitened data to short straight lines in a given time window and combine them in a non linear filter named ALF. We study the performances and efficiencies of these filters, with the help of a catalogue of simulated supernova signals. The ALF filter is the most performant and most efficient of all filters. Its performance reaches about 80% of the Optimal Filter performance designed for the same signals. Such a filter could be implemented as an online trigger (dedicated to detect ...
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