LIGO Document T2100200-v2

O3 lines and combs in found in self-gated C01 data

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Document type:
T - Technical notes
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13 May 2021, 10:41
Lists of vetted lines and combs for H1 and L1 during the O3 epoch.

Run-averaged, noise-weighted spectra were generated using 7200-s-long FFTs (Tukey-windowing) from observing quality self-gated C01 data minus CAT1 vetoes. Spectra data was inspected visually for artifacts and correlated with known non-astrophysical features. These lists may be periodically revised as additional understanding and insights are gained. Since the spectra are high-resolution and many averages are used to create the O3 run-average spectra, many more features are visible than would be when analyzing spectra made using short FFT duration and few averages. The high resolution allows to see many artifacts in different frequency bins as well as revealing weak features that need many averages to stick out of the background.

These lists contain only a subset of spectral artifacts present in the data; other unidentified features are also present, but have not yet been verified to be non-astrophysical. See T2100201-v2. Because of the self-gating, the noise floor, especially in the 50 - 500 Hz band, is lower than non-gated C01 spectra so that more spectral artifacts are observed.

Note that the files from the lines repository with git tags appended to their filenames. For example, git tag O3_lines_v1_2 corresponds to files with the appendix _v1_2 in their filename.

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