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Spectral line removal in the LIGO Data Analysis System (LDAS)

Antony C Searle, Susan M Scott and David E McClelland

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High power in narrow frequency bands, spectral lines, are a feature of an interferometric gravitational wave detector's output. Some lines are coherent between interferometers, in particular, the 2 km and 4 km LIGO Hanford instruments. This is of concern to data analysis techniques, such as the stochastic background search, that use correlations between instruments to detect gravitational radiation. Several techniques of 'line removal' have been proposed. Where a line is attributable to a measurable environmental disturbance, a simple linear model may be fitted to predict, and subsequently subtract away, that line. This technique has been implemented (as the command oelslr) in the LIGO Data Analysis System (LDAS). We demonstrate its application to LIGO S1 data.


PACS

04.80.Nn Gravitational wave detectors and experiments

95.55.Ym Gravitational radiation detectors; mass spectrometers; and other instrumentation and techniques

02.70.Hm Spectral methods

07.60.Ly Interferometers

MSC

83C35 Gravitational waves

Subjects

Computational physics

Instrumentation and measurement

Gravitation and cosmology

Astrophysics and astroparticles

Dates

Issue 17 (7 September 2003)

Received 17 April 2003

Published 11 August 2003



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