Paper published by The LIGO Scientific Collaboration, the Virgo Collaboration
All-sky search for continuous gravitational waves from isolated neutron stars using Advanced LIGO O2 data
We present results of an all-sky search for continuous gravitational waves (CWs), which can be produced by fast spinning neutron stars with an asymmetry around their rotation axis, using data from the second observing run of the Advanced LIGO detectors. Three different semicoherent methods are used to search in a gravitational-wave frequency band from 20 to 1922 Hz and a first frequency derivative from −1×10−8 to 2×10−9 Hz/s. None of these searches has found clear evidence for a CW signal, so upper limits on the gravitational-wave strain amplitude are calculated, which for this broad range in parameter space are the most sensitive ever achieved.
Image. Comparison of O1 and O2 95% upper limits on the strain amplitude for the FrequencyHough pipeline. The O2 search covered the range between 20 and 1000 Hz, while the O1 search arrived up to 475 Hz. They have been obtained adding simulated signals to the real data, covering the same parameter space as in the actual search.
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