@article{1271f5fdc3f24eb78c30af85d9f39789,
title = "First low frequency all-sky search for continuous gravitational wave signals",
abstract = "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 and 128 Hz with a range of spin-down between -1.0×10-10 and +1.5×10-11 Hz/s, and was based on a hierarchical approach. The starting point was a set of short fast Fourier transforms, of length 8192 s, built from the calibrated strain data. Aggressive data cleaning, in both 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 data set 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 fast Fourier transforms followed by a further incoherent analysis, still based on the FrequencyHough transform. No evidence for continuous gravitational wave signals was found, and 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 and 128 Hz. This is the first all-sky search for continuous gravitational waves conducted, on data of ground-based interferometric detectors, at frequencies below 50 Hz. We set upper limits in the range between about 10-24 and 2×10-23 at most frequencies. Our upper limits on signal strain show an improvement of up to a factor of ∼2 with respect to the results of previous all-sky searches at frequencies below 80 Hz.",
author = "{LIGO Scientific Collaboration and Virgo Collaborations} and J. Aasi and Abbott, {B. P.} and R. Abbott and Abbott, {T. D.} and Abernathy, {M. R.} and F. Acernese and K. Ackley and C. Adams and T. Adams and P. Addesso and Adhikari, {R. X.} and Adya, {V. B.} and C. Affeldt and M. Agathos and K. Agatsuma and N. Aggarwal and Aguiar, {O. D.} and A. Ain and P. Ajith and B. Allen and A. Allocca and Amariutei, {D. V.} and M. Andersen and Anderson, {S. B.} and Anderson, {W. G.} and K. Arai and Araya, {M. C.} and Arceneaux, {C. C.} and Areeda, {J. S.} and N. Arnaud and G. Ashton and Aston, {S. M.} and P. Astone and P. Aufmuth and C. Aulbert and S. Babak and Baker, {P. T.} and F. Baldaccini and G. Ballardin and Ballmer, {S. W.} and Barayoga, {J. C.} and Barclay, {S. E.} and Barish, {B. C.} and D. Barker and F. Barone and B. Barr and L. Barsotti and M. Barsuglia and J. Bartlett and Barton, {M. A.} and I. Bartos and R. Bassiri and A. Basti and Batch, {J. C.} and C. Baune and V. Bavigadda and B. Behnke and M. Bejger and C. Belczynski and Bell, {A. S.} and Berger, {B. K.} and J. Bergman and G. Bergmann and Berry, {C. P.L.} and D. Bersanetti and A. Bertolini and J. Betzwieser and S. Bhagwat and R. Bhandare and Bilenko, {I. A.} and G. Billingsley and J. Birch and R. Birney and S. Biscans and M. Bitossi and C. Biwer and Bizouard, {M. A.} and Blackburn, {J. K.} and Blair, {C. D.} and D. Blair and S. Bloemen and O. Bock and Bodiya, {T. P.} and M. Boer and G. Bogaert and P. Bojtos and C. Bond and F. Bondu and R. Bonnand and R. Bork and M. Born and V. Boschi and Sukanta Bose and C. Bradaschia and Brady, {P. R.} and Braginsky, {V. B.} and M. Branchesi and V. Branco and Brau, {J. E.} and T. Briant and A. Brillet and M. Brinkmann and V. Brisson and P. Brockill and Brooks, {A. F.} and Brown, {D. A.} and D. Brown and Brown, {D. D.} and Brown, {N. M.} and Buchanan, {C. C.} and A. Buikema and T. Bulik and Bulten, {H. J.} and A. Buonanno and D. Buskulic and C. Buy and Byer, {R. L.} and L. Cadonati and G. Cagnoli and {Calder{\'o}n Bustillo}, J. and E. Calloni and Camp, {J. B.} and Cannon, {K. C.} and J. Cao and Capano, {C. D.} and E. Capocasa and F. Carbognani and S. Caride and {Casanueva Diaz}, J. and C. Casentini and S. Caudill and M. Cavagli{\`a} and F. Cavalier and R. Cavalieri and C. Celerier and G. Cella and C. Cepeda and {Cerboni Baiardi}, L. and G. Cerretani and E. Cesarini and R. Chakraborty and T. Chalermsongsak and Chamberlin, {S. J.} and S. Chao and P. Charlton and E. Chassande-Mottin and X. Chen and Y. Chen and C. Cheng and A. Chincarini and A. Chiummo and Cho, {H. S.} and M. Cho and Chow, {J. H.} and N. Christensen and Q. Chu and S. Chua and S. Chung and G. Ciani and F. Clara and Clark, {J. A.} and F. Cleva and E. Coccia and Cohadon, {P. F.} and A. Colla and Collette, {C. G.} and M. Colombini and M. Constancio and A. Conte and L. Conti and D. Cook and Corbitt, {T. R.} and N. Cornish and A. Corsi and Costa, {C. A.} and Coughlin, {M. W.} and Coughlin, {S. B.} and Coulon, {J. P.} and Countryman, {S. T.} and P. Couvares and Coward, {D. M.} and Cowart, {M. J.} and Coyne, {D. C.} and R. Coyne and K. Craig and Creighton, {J. D.E.} and J. Cripe and Crowder, {S. G.} and A. Cumming and L. Cunningham and E. Cuoco and Canton, {T. Dal} and Damjanic, {M. D.} and Danilishin, {S. L.} and S. D'Antonio and K. Danzmann and Darman, {N. S.} and V. Dattilo and I. Dave and Daveloza, {H. P.} and M. Davier and Davies, {G. S.} and Daw, {E. J.} and R. Day and D. Debra and G. Debreczeni and J. Degallaix and {De Laurentis}, M. and S. Del{\'e}glise and {Del Pozzo}, W. and T. Denker and T. Dent and H. Dereli and V. Dergachev and {De Rosa}, R. and Derosa, {R. T.} and R. Desalvo and S. Dhurandhar and D{\'i}az, {M. C.} and {Di Fiore}, L. and {Di Giovanni}, M. and {Di Lieto}, A. and {Di Palma}, I. and {Di Virgilio}, A. and G. Dojcinoski and V. Dolique and E. Dominguez and F. Donovan and Dooley, {K. L.} and S. Doravari and R. Douglas and Downes, {T. P.} and M. Drago and Drever, {R. W.P.} and Driggers, {J. C.} and Z. Du and M. Ducrot and Dwyer, {S. E.} and Edo, {T. B.} and Edwards, {M. C.} and M. Edwards and A. Effler and Eggenstein, {H. B.} and B. Gendre and Howell, {E. J.} and L. Ju and {Van Heijningen}, J. and L. Wen and C. Zhao and Zhu, {X. J.}",
year = "2016",
month = feb,
day = "25",
doi = "10.1103/PhysRevD.93.042007",
language = "English",
volume = "93",
pages = "27",
journal = "Physical Review D - Particles, Fields, Gravitation and Cosmology",
issn = "1550-7998",
publisher = "American Physical Society",
number = "4",
}