Gravitational Wave Emission from Galactic Radio Pulsars

We consider in this work continuous gravitational wave (GW) emission from non-axisymmetric radio pulsars. We treat in some detail the observational issues related to the known radio pulsar sample with the aim of unveiling the actual number of sources contributing to GW, which are likely to be the main contributors of GWs. It is shown that the operation of spheroidal GW detectors and full-size interferometers could detect this component of the radiation or impose useful limits on the effective oblateness of young radio pulsars.Comment: 7 pages, RevTex , no figures , to appear in Phys. Rev.

Narrowband Searches for Continuous and Long-duration Transient Gravitational Waves from Known Pulsars in the LIGO-Virgo Third Observing Run

Isolated neutron stars that are asymmetric with respect to their spin axis are possible sources of detectable continuous gravitational waves. This paper presents a fully coherent search for such signals from eighteen pulsars in data from LIGO and Virgo's third observing run (O3). For known pulsars, efficient and sensitive matched-filter searches can be carried out if one assumes the gravitational radiation is phase-locked to the electromagnetic emission. In the search presented here, we relax this assumption and allow both the frequency and the time derivative of the frequency of the gravitational waves to vary in a small range around those inferred from electromagnetic observations. We find no evidence for continuous gravitational waves, and set upper limits on the strain amplitude for each target. These limits are more constraining for seven of the targets than the spin-down limit defined by ascribing all rotational energy loss to gravitational radiation. In an additional search, we look in O3 data for long-duration (hours-months) transient gravitational waves in the aftermath of pulsar glitches for six targets with a total of nine glitches. We report two marginal outliers from this search, but find no clear evidence for such emission either. The resulting duration-dependent strain upper limits do not surpass indirect energy constraints for any of these targets. © 2022. The Author(s). Published by the American Astronomical Society

City and Region - Urban and Agricultural Rent in England, 1400-1914

As Europe moved from a 'preindustrial' and predominantly rural stage towards an urban-industrial society, improvements in agricultural productivity and more intensive patterns of land use produced upward pressures on rent. However the slow emergence of market relations and the persistence of ancient tenures underlay wide regional and local variations. In fact surprisingly little is known about rent movements over long periods of time, and even less about the growing divergence between rural and urban rents in the centuries before 1914. City and Region assembles new data for just one part of England, the metropolitan region, for Kent, Essex, and the City of London. We intend to add further material, and hope that other researchers will join with us in providing a more complete picture of this and other regions in Britain. Our aim is to link historic rental data with the texts and images which form its underlying documentation: details of leases and teneurial arrangements, and maps, building plans, surveys and architectural drawings. So far, we have assembled serial data for the Rochester Bridge and Cobham College estates from 1577-1914. We intend to add other estates in the region, including those of London Bridge and Eton College, and to push our starting-date back to 1400. This record was migrated from the OpenDepot repository service in June, 2017 before shutting down