
We present direct upper limits on gravitational wave emission from the Crab pulsar using data from the first nine months of the fifth science run of the Laser Interferometer Gravitational-wave Observatory (LIGO). These limits are based on two searches. In the first we assume that the gravitational wave emission follows the observed radio timing, giving an upper limit on gravitational wave emission that beats indirect limits inferred from the spin-down and braking index of the pulsar and the energetics of the nebula. In the second we allow for a small mismatch between the gravitational and radio signal frequencies and interpret our results in the context of two possible gravitational wave emission mechanisms.
Accepted for Ap. J. Lett. Minor changes in results due to calibration correction
stars, astronomy & astrophysics, Physics, Astrophysics (astro-ph), wind tori, FOS: Physical sciences, 535, Individual (crab pulsar) online material, General Relativity and Quantum Cosmology (gr-qc), pulsars : individual (crab pulsar), Astrophysics, 530, 520, General Relativity and Quantum Cosmology, radiation, neutron, Gravitational waves - pulsars, gravitational waves, pulsars: individual (Crab pulsar), Subject headings, Color figure, QC, Color figure; Gravitational waves - pulsars; Individual (crab pulsar) online material; Subject headings; Astronomy and Astrophysics; Space and Planetary Science
stars, astronomy & astrophysics, Physics, Astrophysics (astro-ph), wind tori, FOS: Physical sciences, 535, Individual (crab pulsar) online material, General Relativity and Quantum Cosmology (gr-qc), pulsars : individual (crab pulsar), Astrophysics, 530, 520, General Relativity and Quantum Cosmology, radiation, neutron, Gravitational waves - pulsars, gravitational waves, pulsars: individual (Crab pulsar), Subject headings, Color figure, QC, Color figure; Gravitational waves - pulsars; Individual (crab pulsar) online material; Subject headings; Astronomy and Astrophysics; Space and Planetary Science
| selected citations These citations are derived from selected sources. This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically). | 161 | |
| popularity This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network. | Top 10% | |
| influence This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically). | Top 1% | |
| impulse This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network. | Top 1% |
