| Autor: |
Ryan Quitzow-James, James Brau, James A Clark, Michael W Coughlin, Scott B Coughlin, Raymond Frey, Paul Schale, Dipongkar Talukder, Eric Thrane |
| Předmět: |
|
| Zdroj: |
Classical & Quantum Gravity; 8/17/2017, Vol. 34 Issue 16, p1-1, 1p |
| Abstrakt: |
Soft gamma repeaters and anomalous x-ray pulsars are thought to be magnetars, neutron stars with strong magnetic fields of order –. These objects emit intermittent bursts of hard x-rays and soft gamma rays. Quasiperiodic oscillations in the x-ray tails of giant flares imply the existence of neutron star oscillation modes which could emit gravitational waves powered by the magnetar’s magnetic energy reservoir. We describe a method to search for transient gravitational-wave signals associated with magnetar bursts with durations of 10 s to 1000 s of seconds. The sensitivity of this method is estimated by adding simulated waveforms to data from the sixth science run of Laser Interferometer Gravitational-wave Observatory (LIGO). We find a search sensitivity in terms of the root sum square strain amplitude of for a half sine-Gaussian waveform with a central frequency Hz and a characteristic time s. This corresponds to a gravitational wave energy of , the same order of magnitude as the 2004 giant flare which had an estimated electromagnetic energy of , where d is the distance to SGR 1806-20. We present an extrapolation of these results to Advanced LIGO, estimating a sensitivity to a gravitational wave energy of for a magnetar at a distance of kpc. These results suggest this search method can probe significantly below the energy budgets for magnetar burst emission mechanisms such as crust cracking and hydrodynamic deformation. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
