期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 513, 期 1, 页码 1105-1114出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stac984
关键词
gravitational waves
资金
- NSF's LIGO Laboratory - National Science Foundation
- United States National Science Foundation (NSF)
- Science and Technology Facilities Council (STFC) of the United Kingdom
- Max-Planck-Society (MPS)
- State of Niedersachsen/Germany
- Australian Research Council
- French Centre National de Recherche Scientifique (CNRS)
- Italian Istituto Nazionale della Fisica Nucleare (INFN)
- Monaco, Poland, Portugal - Fond de la Recherche Scientifique de Belgique (F.R.S.-FNRS) [2.5020.11]
- Walloon Region
- NSF
- STFC
- CNRS
- Stochastic Working Group of the LIGO-Virgo-KAGRA Scientific Collaboration
- FRIA Grant of the Belgian Fund for Research, F.R.S.-FNRS
- FSR Incoming Postdoctoral Fellowship [LIGO-P2200050]
Rotating neutron stars are potential sources of gravitational waves in the frequency range detectable by ground-based detectors. By measuring the stochastic gravitational-wave background created by the superposition of signals from individually undetectable neutron stars, properties such as the average ellipticity can be determined.
Rotating neutron stars (NSs) are promising sources of gravitational waves (GWs) in the frequency band of ground-based detectors. They are expected to emit quasi-monochromatic, long-duration GW signals, called continuous waves (CWs), due to their deviations from spherical symmetry. The degree of such deformations, and hence the information about the internal structure of an NS, is encoded in a dimension-less parameter s called ellipticity. Searches for CW signals from isolated Galactic NSs have shown to be sensitive to ellipticities as low as epsilon similar to O(10(-9)). These searches are optimal for detecting and characterizing GWs from individual NSs, but they are not designed to measure the properties of NSs as population, such as the average ellipticity epsilon(av). These ensemble properties can be determined by the measurement of the stochastic gravitational-wave background (SGWB) arising from the superposition of GW signals from individually undetectable NSs. In this work, we perform a cross-correlation search for such a SGWB using the data from the first three observation runs of Advanced LIGO and Virgo. Finding no evidence for an SGWB signal, we set upper limits on the dimension-less energy density parameter Omega(gw)(f). Using these results, we also constrain the average ellipticity of Galactic NSs and five NS `hotspots', as a function of the number of NSs emitting GWs within the frequency band of the search N-band. We find epsilon(av) less than or similar to 1.8 x 10(-8), with N-band = 1.6 x 10(7), for Galactic NSs, and epsilon(av) less than or similar to [3.5 - 11.8] x 10(-7) , with N-band = 1.6 x 10(10), for NS hotspots.
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