Detection of periodic gravitational wave sources by Hough transform in the
                    <i>f</i>
                    versus \skew6\dot f plane

Antonucci, F.; Astone, P.; D’Antonio, S.; Frasca, S.; Palomba, C.

doi:10.1088/0264-9381/25/18/184015

Cited by 39 publications

(64 citation statements)

References 10 publications

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“…The FrequencyHough method is described in detail in [23,37,38]. Calibrated detector data is used to create SFTs with coherence time depending on the frequency band being considered, see Table II.…”

Section: B Frequencyhough Search Methodsmentioning

confidence: 99%

All-sky search for periodic gravitational waves in the O1 LIGO data

Abbott¹,

Abbott²,

Abbott³

et al. 2017

Phys. Rev. D

178

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We report on an all-sky search for periodic gravitational waves in the frequency band 20-475 Hz and with a frequency time derivative in the range of ½−1.0; þ0.1 × 10 −8 Hz=s. Such a signal could be produced by a nearby spinning and slightly nonaxisymmetric isolated neutron star in our galaxy. This search uses the data from Advanced LIGO's first observational run, O1. No periodic gravitational wave signals were observed, and upper limits were placed on their strengths. The lowest upper limits on worst-case (linearly polarized) strain amplitude h 0 are ∼4 × 10 −25 near 170 Hz. For a circularly polarized source (most favorable orientation), the smallest upper limits obtained are ∼1.5 × 10 −25 . These upper limits refer to all sky locations and the entire range of frequency derivative values. For a population-averaged ensemble of sky locations and stellar orientations, the lowest upper limits obtained for the strain amplitude are ∼2.5 × 10 −25 .

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Section: B Frequencyhough Search Methodsmentioning

confidence: 99%

All-sky search for periodic gravitational waves in the O1 LIGO data

Abbott¹,

Abbott²,

Abbott³

et al. 2017

Phys. Rev. D

178

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“…The total number of sky patches is N sky ≈ 3.5 × 10 6 . Each corrected peakmap is the input of the incoherent step, based on the FrequencyHough transform [7,24]. This is a very efficient implementation of the Hough transform (see [24] for efficiency tests and comparison with a different implementation) which, for every sky position, maps the points of the peakmap into the signal frequency/spin-down plane.…”

Section: The Analysis Proceduresmentioning

confidence: 99%

“…Each corrected peakmap is the input of the incoherent step, based on the FrequencyHough transform [7,24]. This is a very efficient implementation of the Hough transform (see [24] for efficiency tests and comparison with a different implementation) which, for every sky position, maps the points of the peakmap into the signal frequency/spin-down plane. In the FrequencyHough transform we take into account slowly varying non-stationarity in the noise and the varying detector sensitivity caused by the time-dependent radiation pattern [25], [26].…”

Section: The Analysis Proceduresmentioning

confidence: 99%

First low frequency all-sky search for continuous gravitational wave signals

Aasi¹,

Abbott²,

Abbott³

et al. 2016

Phys. Rev. D

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27 pages, 19 figures, see paper for full list of authors.International audienceIn 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 Hz and 128 Hz with a range of spin-down between −1.0×10−10 Hz/s 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 (FFT), of length 8192 seconds, built from the calibrated strain data. Aggressive data cleaning, both in 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 dataset 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 FFTs followed by a further incoherent analysis. No evidence for continuous gravitational wave signals was found, 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 Hz and 128 Hz. This is the first all-sky search for continuous gravitational waves conducted 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

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“…While such a method would be suboptimal when we are not computationally limited, it would lead to a closer to optimal method in the presence of computational constraints. Examples of such methods are described in [89][90][91], and examples of GW searches employing them are [67,[92][93][94]. The sensitivity of these searches is h min…”

Section: Core Collapse Supernovae and Hot Remnantsmentioning

confidence: 99%

Gravitational waves from neutron stars: promises and challenges

et al. 2010

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We discuss different ways that neutron stars can generate gravitational waves, describe recent improvements in modelling the relevant scenarios in the context of improving detector sensitivity, and show how observations are beginning to test our understanding of fundamental physics. The main purpose of the discussion is to establish promising science goals for third-generation ground-based detectors, like the Einstein Telescope, and identify the various challenges that need to be met if we want to use gravitational-wave data to probe neutron star physics

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Detection of periodic gravitational wave sources by Hough transform in the f versus \skew6\dot f plane

Cited by 39 publications

References 10 publications

All-sky search for periodic gravitational waves in the O1 LIGO data

All-sky search for periodic gravitational waves in the O1 LIGO data

First low frequency all-sky search for continuous gravitational wave signals

Gravitational waves from neutron stars: promises and challenges

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