2010/09/30 by Stefania Marassi, R. Ciolfi, Riccardo Ciolfi +4 · 5 citations
Earth and Planetary Sciences · Physics and Astronomy · #Astronomy #Astrophysics #Cosmology and Gravitation Theories #Einstein Telescope #Geophysics and Gravity Measurements #Gravitational wave #Magnetar #Magnetic field #Neutron star #Physics #Pulsars and Gravitational Waves Research #astro-ph.CO #gr-qc
paper · pdf · doi:10.1111/j.1365-2966.2010.17861.x
9 pages, 5 figures, accepted for publication in MNRAS
arxiv created 2010/10/22 · openalex publication_date 2010/12/03 · arxiv updated 2015/05/19 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Two classes of high-energy sources in our galaxy are believed to host magnetars, i.e. neutron stars whose emission results from the dissipation of their magnetic field. The extremely high magnetic field of magnetars distorts their shape, and causes the emission of a conspicuous gravitational wave signal if rotation is fast and takes place around a different axis than the symmetry axis of the magnetic distortion. Based on a numerical model of the cosmic star formation history, we derive the cosmological background of gravitational waves produced by magnetars, when they are very young and fast spinning. We adopt different models for the configuration and strength of the internal magnetic field (which determines the distortion) as well as different values of the external dipole field strength (which governs the spin evolution of magnetars over a wide range of parameters). We find that the expected gravitational wave background differs considerably from one model to another. The strongest signals are generated for magnetars with very intense toroidal internal fields (∼1016 G range) and external dipole fields of ∼1014, as envisaged in models aimed at explaining the properties of the 2004 December giant flare from SGR 1806−20. Such signals should be easily detectable with third-generation ground-based interferometers such as the Einstein Telescope.