Paper published by P. B. Covas et al. (LSC Instrument Authors) in Physical Review D.
Identification and mitigation of narrow spectral artifacts that degrade searches for persistent gravitational waves in the first two observing runs of Advanced LIGO
Searches are under way in Advanced LIGO and Virgo data for persistent gravitational waves from continuous sources, e.g. rapidly rotating galactic neutron stars, and stochastic sources, e.g. relic gravitational waves from the Big Bang or superposition of distant astrophysical events such as mergers of black holes or neutron stars. These searches can be degraded by the presence of narrow spectral artifacts (lines) due to instrumental or environmental disturbances. We describe a variety of methods used for finding, identifying and mitigating these artifacts, illustrated with particular examples. Results are provided in the form of lists of line artifacts that can safely be treated as non-astrophysical. Such lists are used to improve the efficiencies and sensitivities of continuous and stochastic gravitational wave searches by allowing vetoes of false outliers and permitting data cleaning.
Paper link available below at citation information
Citation:
P. B. Covas et al. (LSC Instrument Authors)
Identification and mitigation of narrow spectral artifacts that degrade searches for persistent gravitational waves in the first two observing runs of Advanced LIGO
Phys. Rev. D 97, 082002
https://doi.org/10.1103/PhysRevD.97.082002
Published data: 23/04/2018
Figure 5 from the paper. Typical plots produced by Fscan: (a) a spectrogram of one day (April 23, 2017) of Hanford strain data (with color-coded amplitude); (b) the corresponding daily averaged normalized power versus the frequency.
