Subtracting Narrow-band Noise from LIGO Strain Data in the Third Observing Run

Document #:

LIGO-T2100058-v3

Document type:

T - Technical notes

Abstract:

The LIGO strain data contains narrow-band noise features due to injections from the photon calibrator and actuation system used to assist with the calibration and due to the 60 Hz A/C current of the U.S. power grid, along with the accompanying harmonics of this power mains noise. These narrow-band noise features can be disruptive to searches for persistent gravitational-wave signals, such as the search for continuous wave sources and a stochastic background. In an effort to improve the data quality for these analysis efforts, the LIGO calibration team developed a method for subtracting the narrow-band photon calibrator and actuation injections and power mains noise from the strain data in LIGO's third observing run. Here we discuss the methods used to achieve this subtraction.

Files in Document:

• GstlalCalibrationNoiseSubtraction.pdf (792.6 kB)

Topics:

• Calibration

Authors:

• Aaron Viets
• Madeline Wade