Upper limit map of a background of gravitational waves

Abbott, B., Abbott, R., Adhikari, R., Agresti, J., Ajith, P., Allen, B., Amin, R., Anderson, S., Anderson, W., Arain, M., Araya, M., Armandula, H., Ashley, M., Aston, S., Aufmuth, P., Aulbert, C., Babak, S., Ballmer, S., Bantilan, H., Barish, B., Barker, C., Barker, D., Barr, B., Barriga, P., Barton, M., Bayer, K., Belczynski, K., Betzwieser, J., Beyersdorf, P., Bhawal, B., Bilenko, I., Billingsley, G., Biswas, R., Black, E., Blackburn, K., Blackburn, L., Blair, D., Bland, B., Bogenstahl, J., Bogue, L., Bork, R., Boschi, V., Bose, S., Brady, P., Braginsky, V., Brau, J., Brinkmann, M., Brooks, A., Brown, D., Bullington, A., Bunkowski, A., Buonanno, A., Burmeister, O., Busby, D., Byer, R., Cadonati, L., Cagnoli, G., Camp, J., Cannizzo, J., Cannon, K., Cantley, C., Cao, J., Cardenas, L., Casey, M., Castaldi, G., Cepeda, C., Chalkey, E., Charlton, P., Chatterji, S., Chelkowski, S., Chen, Y., Chiadini, F., Chin, D., Chin, E., Chow, J., Christensen, N., Clark, C., Cochrane, P., Cokelaer, Thomas, Colacino, C., Coldwell, R., Conte, R., Cook, D., Corbitt, T., Coward, D., Coyne, D., Creighton, J., Creighton, T., Croce, R., Crooks, D., Cruise, A., Cumming, A., Dalrymple, J., D'Ambrosio, E., Danzmann, K., Davies, Geraint, DeBra, D., Degallaix, J., Degree, M., Demma, T., Dergachev, V., Desai, S., DeSalvo, R., Dhurandhar, S., Díaz, M., Dickson, J., Di Credico, A., Diederichs, G., Dietz, Alexander, Doomes, E., Drever, R., Dumas, J.-C., Dupuis, R., Dwyer, J., Ehrens, P., Espinoza, E., Etzel, T., Evans, M., Evans, T., Fairhurst, Stephen ORCID: https://orcid.org/0000-0001-8480-1961, Fan, Y., Fazi, D., Fejer, M., Finn, L., Fiumara, V., Fotopoulos, N., Franzen, A., Franzen, K., Freise, A., Frey, R., Fricke, T., Fritschel, P., Frolov, V., Fyffe, M., Galdi, V., Garofoli, J., Gholami, I., Giaime, J., Giampanis, S., Giardina, K., Goda, K., Goetz, E., Goggin, L., González, G., Gossler, S., Grant, A., Gras, S., Gray, C., Gray, M., Greenhalgh, J., Gretarsson, A., Grosso, R., Grote, H., 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Upper limit map of a background of gravitational waves. Physical Review D - Particles, Fields, Gravitation and Cosmology 76 (8) , 082003. 10.1103/PhysRevD.76.082003

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Abstract

We searched for an anisotropic background of gravitational waves usingdata from the LIGO S4 science run and a method that is optimizedfor point sources. This is appropriate if, for example, the gravitationalwave background is dominated by a small number of distinct astrophysical sources.No signal was seen. Upper limit maps were produced assuming two differentpower laws for the source strain power spectrum. For an f-3 power law and using the50 Hz to 1.8 kHz band the upper limits on the sourcestrain power spectrum vary between 1.2×10-48 Hz-1 (100 Hz/f)3 and 1.2×10-47 Hz-1 (100 Hz/f)3, depending on the position in the sky. Similarly,in the case of constant strain power spectrum, the upper limits vary between 8.5×10-49 Hz-1 and 6.1×10-48 Hz-1. As a side product a limiton an isotropic background of gravitational waves was also obtained. All limitsare at the 90% confidence level. Finally, as an application, we focused onthe direction of Sco-X1, the brightest low-mass x-ray binary. We compare theupper limit on strain amplitude obtained by this method to expectations basedon the x-ray flux from Sco-X1.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy Medicine Cardiff University Brain Research Imaging Centre (CUBRIC)
Subjects:	Q Science > QB Astronomy
Additional Information:	11 pages.
Publisher:	American Physical Society
ISSN:	1550-7998
Last Modified:	05 Jul 2024 20:15
URI:	https://orca.cardiff.ac.uk/id/eprint/21777

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