Evidence-based search method for gravitational waves from neutron star ring-downs
- Department of Physics and Astronomy, Kelvin Building, Glasgow G12 8QQ (United Kingdom)
The excitation of quadrupolar quasinormal modes in a neutron star leads to the emission of a short, distinctive, burst of gravitational radiation in the form of a decaying sinusoid or 'ring-down'.' We present a Bayesian analysis method which incorporates relevant prior information about the source and known instrumental artifacts to conduct a robust search for the gravitational wave emission associated with pulsar glitches and soft {gamma}-ray repeater flares. Instrumental transients are modeled as sine-Gaussian and their evidence, or marginal likelihood, is compared with that of Gaussian white noise and ring-downs via the 'odds-ratio'. Tests using simulated data with a noise spectral density similar to the LIGO interferometer around 1 kHz yield 50% detection efficiency and 1% false alarm probability for ring-down signals with signal-to-noise ratio {rho}=5.2. For a source at 15 kpc this requires an energy of 1.3x10{sup -5}M{sub {center_dot}}c{sup 2} to be emitted as gravitational waves.
- OSTI ID:
- 21027562
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 76, Issue 4; Other Information: DOI: 10.1103/PhysRevD.76.043003; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
COMPUTERIZED SIMULATION
COSMOLOGY
DETECTION
EFFICIENCY
EXCITATION
GAMMA ASTRONOMY
GAMMA RADIATION
GRAVITATIONAL RADIATION
GRAVITATIONAL WAVE DETECTORS
GRAVITATIONAL WAVES
INTERFEROMETERS
KHZ RANGE
NEUTRON STARS
PULSARS
SIGNAL-TO-NOISE RATIO
SIGNALS
SPECTRAL DENSITY
TRANSIENTS