Directional limits on persistent gravitational waves from advanced LIGO’s first observing run

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dc.contributor.author Sengupta, Anand
dc.date.accessioned 2017-04-15T20:32:45Z
dc.date.available 2017-04-15T20:32:45Z
dc.date.issued 2017-03
dc.identifier.citation Sengupta, Anand et al., “Directional limits on persistent gravitational waves from advanced LIGO’s first observing run”, Physical Review Letters, DOI: 10.1103/PhysRevLett.118.121102, vol. 118, no. 12, Mar. 2017. en_US
dc.identifier.issn 0031-9007
dc.identifier.issn 1079-7114
dc.identifier.uri https://repository.iitgn.ac.in/handle/123456789/2847
dc.identifier.uri http://dx.doi.org/10.1103/PhysRevLett.118.121102
dc.description.abstract We employ gravitational-wave radiometry to map the stochastic gravitational wave background expected from a variety of contributing mechanisms and test the assumption of isotropy using data from the Advanced Laser Interferometer Gravitational Wave Observatory’s (aLIGO) first observing run. We also search for persistent gravitational waves from point sources with only minimal assumptions over the 20–1726 Hz frequency band. Finding no evidence of gravitational waves from either point sources or a stochastic background, we set limits at 90% confidence. For broadband point sources, we report upper limits on the gravitational wave energy flux per unit frequency in the range F α , Θ ( f ) < ( 0.1 – 56 ) × 10 − 8         erg   cm − 2   s − 1   Hz − 1 ( f / 25     Hz ) α − 1 depending on the sky location Θ and the spectral power index α . For extended sources, we report upper limits on the fractional gravitational wave energy density required to close the Universe of Ω ( f , Θ ) < ( 0.39 – 7.6 ) × 10 − 8     sr − 1 ( f / 25     Hz ) α depending on Θ and α . Directed searches for narrowband gravitational waves from astrophysically interesting objects (Scorpius X-1, Supernova 1987 A, and the Galactic Center) yield median frequency-dependent limits on strain amplitude of h 0 < ( 6.7 , 5.5 ,     and     7.0 ) × 10 − 25 , respectively, at the most sensitive detector frequencies between 130–175 Hz. This represents a mean improvement of a factor of 2 across the band compared to previous searches of this kind for these sky locations, considering the different quantities of strain constrained in each case. en_US
dc.description.statementofresponsibility by Anand Sengupta et al.,
dc.format.extent Vol. 118, no. 12
dc.language.iso en_US en_US
dc.publisher American Physical Society en_US
dc.title Directional limits on persistent gravitational waves from advanced LIGO’s first observing run en_US
dc.type Article en_US
dc.relation.journal Physical Review Letters


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