Directed search for continuous gravitational waves from the Galactic center

We report results of a deep all-sky search for periodic gravitational waves from isolated neutron stars in data from the first Advanced LIGO observing run. This search investigates the low frequency range of Advanced LIGO data, between 20 and 100 Hz, much of which was not explored in initial LIGO. The search was made possible by the computing power provided by the volunteers of the Einstein@Home project. We find no significant signal candidate and set the most stringent upper limits to date on the amplitude of gravitational wave signals from the target population, corresponding to a sensitivity depth of 48.7 ½1= ffiffiffiffiffiffi Hz p . At the frequency of best strain sensitivity, near 100 Hz, we set 90% confidence upper limits of 1.8 × 10 −25 . At the low end of our frequency range, 20 Hz, we achieve upper limits of 3.9 × 10 −24 . At 55 Hz we can exclude sources with ellipticities greater than 10 −5 within 100 pc of Earth with fiducial value of the principal moment of inertia of 10 38 kg m 2 .

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“…III) between the observed value and infinity, as done in Eq. (6) of [33]. The distribution of these p values is shown in Fig.…”

Section: B Identification Of Undisturbed Bandsmentioning

confidence: 95%

“…(7) of [33]. Fitting to the distribution of the highest 2F values suggests that N trials ≃ N templ , with N templ being the number of templates searched.…”

Section: B Identification Of Undisturbed Bandsmentioning

confidence: 99%

First low-frequency Einstein@Home all-sky search for continuous gravitational waves in Advanced LIGO data

Abbott¹,

Abbott²,

Abbott³

et al. 2017

Phys. Rev. D

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118

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“…The spindown spacing for the incoherent summing step is finer than that (δ _ f c ) used for the coherent searches by a factor γ. The notation used here is consistent with that used in previous observational papers [3,5,10] and in the GCT methods papers [6,7].…”

Section: Quantities Defining Each Stagementioning

confidence: 97%

“…In fact, a loud signal as well as a loud disturbance would produce high values of the detection statistic at a number of different template grid points, and it would be a waste to follow up each of these independently. As described in Refs., [3,4], we begin with the loudest candidate, i.e., the candidate with the highest value of 2F . This is the seed for the first cluster.…”

Section: A Stagementioning

confidence: 99%

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Hierarchical follow-up of subthreshold candidates of an all-sky Einstein@Home search for continuous gravitational waves on LIGO sixth science run data

et al. 2016

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We report results of an all-sky search for periodic gravitational waves with frequency between 50 and 510 Hz from isolated compact objects, e.g., neutron stars. A new hierarchical multistage approach is taken, supported by the computing power of the Einstein@Home project, allowing us to probe more deeply than ever before. 16 million subthreshold candidates from the initial search [LIGO Scientific and Virgo Collaborations, Phys. Rev. D 94, 102002 (2016)] are followed up in four stages. None of those candidates is consistent with an isolated gravitational wave emitter, and 90% confidence level upper limits are placed on the amplitudes of continuous waves from the target population. Between 170.5 and 171 Hz, we set the most constraining 90% confidence upper limit on the strain amplitude h 0 at 4.3 × 10 −25 , while at the high end of our frequency range, we achieve an upper limit of 7.6 × 10 −25 . These are the most constraining allsky upper limits to date and constrain the ellipticity of rotating compact objects emitting at 300 Hz at a distance D to less than 6 × 10 −7 ½ D 100 pc .

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Investigating Binary Black Hole Mergers with Principal Component Analysis

Clark¹,

Cadonati²,

Healy³

et al. 2014

Gravitational Wave Astrophysics

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Despite recent progress in numerical simulations of the coalescence of binary black hole systems, highly asymmetric spinning systems and the construction of accurate physical templates remain challenging and computationally expensive. We explore the feasibility of a prompt and robust test of whether the signals exhibit evidence for generic features that can educate new simulations. We form catalogs of numerical relativity waveforms with distinct physical effects and compute the relative probability that a gravitational wave signal belongs to each catalog. We introduce an algorithm designed to perform this task for coalescence signals using principal component analysis of waveform catalogs and Bayesian model selection and demonstrate its effectiveness.

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Directed search for continuous gravitational waves from the Galactic center

Cited by 96 publications

References 49 publications

First low-frequency Einstein@Home all-sky search for continuous gravitational waves in Advanced LIGO data

First low-frequency Einstein@Home all-sky search for continuous gravitational waves in Advanced LIGO data

Hierarchical follow-up of subthreshold candidates of an all-sky Einstein@Home search for continuous gravitational waves on LIGO sixth science run data

Investigating Binary Black Hole Mergers with Principal Component Analysis

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