2003/10/31 by Rafael Angel Araya-Gochez, Rafael A. Araya-Góchez · 1 citation
Physics and Astronomy · #Astrophysical Phenomena and Observations #Astrophysics and Cosmic Phenomena #Pulsars and Gravitational Waves Research #astro-ph #gr-qc
paper · pdf · doi:10.1111/j.1365-2966.2004.07851.x
12 pages, 4 figures, M.N.R.A.S. submission
arxiv created 2003/10/31 · openalex publication_date 2004/11/19 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We examine the possibility that hyper-accretion on to newly born black holes occurs in highly intermittent, non-asymmetric fashion favourable to gravitational-wave emission in a neutrino-cooled disc. This picture of near-hole accretion is motivated by magnetorotationally induced, ultrarelativistic disc dynamics in the region of the flow bounded from below by the marginally bound geodesic radius rmb. For high spin values, a largely coherent magnetic field in this region has the dynamical implication of compact mass segregation at the displacement nodes of the non-axisymmetric, magnetorotational instability modes. When neutrino stress competes favourably for the disc dynamical structure, the matter clumps may be rather dense and sufficiently long-lived to excite the quasi-normal ringing (QNR) modes of the Kerr geometry upon infall. We find that this accretion flow may drive bar-like, quadrupole (l, m= 2, 2) modes in nearly resonant fashion for spin parameters a≥ 0.9. The ensuing build-up in strain amplitude of the undamped oscillations warrants a brisk rate of energy deposition into gravitational waves. A detectability assessment for the LIGO interferometers through the match filtering technique is given by integrating the energy flux over a one-second epoch of resonant hyper-accretion at 1 M⊙ s−1. Thus, a 15-M⊙ Kerr black hole spinning at a≃ 0.98 (fQNR≃ 1677 Hz), and located at 27 Mpc (e.g. GRB 980425), will deliver a characteristic strain amplitude, hchar≃ 2.2−21, large enough to be detectable by LIGO II. If resonant hyper-accretion were sustainable for a longer period (or at higher rates) possibly associated with a second broad hump in a gamma-ray burst light curve, these objects could be detected by LIGO I at very low redshifts.