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キーワード:
General Relativity and Quantum Cosmology, gr-qc
要旨:
We report results of the most sensitive search to date for periodic
gravitational waves from Cassiopeia A, Vela Jr. and G347.3 with frequency
between 20 and 1500 Hz. The search was made possible by the computing power
provided by the volunteers of the Einstein@Home project and improves on
previous results by a factor of 2 across the entire frequency range for all
targets. We find no significant signal candidate and set the most stringent
upper limits to date on the amplitude of gravitational wave signals from the
target population, corresponding to sensitivity depths between 54 $[1/
{\sqrt{\textrm{Hz}}}]$ and 83 $[1/ {\sqrt{\textrm{Hz}}}]$, depending on the
target and the frequency range. At the frequency of best strain sensitivity,
near $172$ Hz, we set 90% confidence upper limits on the gravitational wave
intrinsic amplitude of $h_0^{90\%}\approx 10^{-25}$, probing ellipticity values
for Vela Jr. as low as $3\times 10^{-8}$, assuming a distance of 200 pc.
