LISA Pathfinder Results Graph (IMAGE)
Caption
This plot shows the result of LISA Pathfinder's two-month experiment in drag-free flight, where the goal is to follow test masses as they fall through space affected only by gravity. LISA Pathfinder reduced non-gravitational forces on the test masses to a level five times better than the mission required and within 25 percent of the requirement for a future space-based gravitational wave detector. The cause of the spike around 0.07 hertz is still under investigation. The line labeled "noise model" represents a simple physical model of the measured performance. It consists of a flat component, dominant at low frequencies, arising from residual gas molecules around the test mass and a rising component, dominant at higher frequencies, representing the limits of the instrument's ability to sense the motion of the test masses. This model explains the vast majority of the observed behavior, providing confidence that such models can be used to extrapolate from LISA Pathfinder to a full-scale future observatory.
Credit
NASA's Goddard Space Flight Center
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